Crabs’ eyes

Lemery [1713] p. 21. Taking the contemporary English translation as evidence, such a broad understanding of alkalis can be found back in the first edition of Lemeiy s discourse and is put forward there as an established and familiar notion. Many stony matters, such as Coralls, Perles, Crabs-eyes, are called Alkalis, by reason of the effervescency that always happens, when you pour Acids upon them. Lastly, all things which do absorbe or sweeten Acids by ebullition are called Alkalis in Chemistry [...]. Lemery [1677] p. 9. 

The presence of gangliosides in crab eye stalks (Ishizuka et al. 1970, SvENNERHOLM 1970) appears uncertain (Wiegandt 1971), while the isolation of a haemagglutinin from a lobster yielded a sialic acid component (Acton et al. 1973). Analyses of several insects including Musca domestica, Calliphora erythrocephala (Wiegandt 1971), Drosophila melanogaster larval and adult forms and the eyes and ganglia of several other flies (unpublished) showed no sialic acids. 

A core assumption of ultra-Darwinism is that if not all, then most observed characters must be adaptive, so as to provide the phenotypic material upon which natural selection can act. However, what constitutes a character - and what constitutes an adaptation - is as much in the eye of the beholder as in the organism that is beheld, as Gould and Lewontin pointed out in their famous paper on spandrels (Gould and Lewontin, 1979). Natural selection s continual scrutiny does not give it an a la carte freedom to accept or reject genotypic or phenotypic variation. Structural constraints insist that evolutionary, genetic mechanisms are not infinitely flexible but must work within the limits of what is physically or chemically possible (for instance, the limits to the size of a single cell occasioned by the physics of diffusion processes, the size of a crustacean like a lobster or crab by the constraints... 

Baccharis multiflora, Baccharis spp. An infusion prepared from the leaves of B. multiflora, Baccharis spp. is said to be effective against catarrhs and was used for urinary problems in 19th century Mexico. Two unidentified species of this genus — quappatli and malinalli — are listed in the Florentine Codex as treatments for blotched face (applied internally) and for worms in the eyes and crab lice in the eyelids (especially applied externally), respectively. 

LAPIS EX CANCRO — is the Stone called Crab s Eye, which is white and round. It is said to be found in the stomach and intestines of hares, and is supposed to break up stone in the bladder. Some say that it is of a frigid and humid nature, others that it is dry. 

Synonyms Abrus precatorius Deadly crab s eye Indian bean Love bean Lucky bean Mienie mienie Prayer bean Rosary bean Rosary pea Seminole bead... 

The true crabs have four pairs of walking legs, some of which have been modified as paddles for swimming (see Figure 4.3). The blue crab (Callinectes sapidus), olive or blue green on its dorsal side with bright blue claws, averages about 9 inches (22.5 cm) in width. Much of the time, the blue crab can be found buried in sand, with only its eyes exposed to the surface. 

Most amazing was a melon-sized clump of matter that we held in our hands and turned around to examine like an extraplanetary object. In the middle was a starry-eyed hermit crab, peering out from underneath a shell encrusted with a half dozen hitchhiker anemones. Elsewhere on the surface was a pair of thumbnail-sized porcelain crabs Tewes handed me a magnifying glass so I could see their exquisite markings. 

Common Names Crab s Eye, Licorice Vine, Love Pea, Precatory Pea, Red-Bead Vine, Rosary Pea... 

Crabs build a cylinder of mud centered on their burrow entrance. Burrows with mud chimneys are less frequently found by crabs seeking new burrows than are burrows without chimneys. In U. beebei chimneys are taller than the eyes of intruders thus making the burrow opening impossible to see. 

Ommin has been found in all investigated orders of the Insecta and Crustaceae. It is an especially common eye pigment in crabs, spiders, insects and cephalopoda, and it is also present in the epidermis of Cragnon, Limulus and Gryllus, but not Carcinus and Portunus. Ommin is present in the eyes and skin, but not in the ink, of Sepia ofpcianalis (Cephalopoda). About 75% of the pigment known as om-... 

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