. Cuvier's animal kingdom : arranged according to its organization. Animals. DECAPODA. 415 and ciliated. The tail is composed of seven segments, but three of them are confluent in the males. The type is Cancer persotiatus, Herbst., found upon the coast of England. [This g:enus is of very difficult location, and has little real relation with Leucosia : it is more nearly allied to some of the arcuated species.] Leiicosia, Fab., has the carapa.\ of variable form, but generally globular or ovoid, and as hard as stone; the lateral antennas and eyes are very small ; the tail, large and suborbicular
. Cuvier's animal kingdom : arranged according to its organization. Animals. DECAPODA. 415 and ciliated. The tail is composed of seven segments, but three of them are confluent in the males. The type is Cancer persotiatus, Herbst., found upon the coast of England. [This g:enus is of very difficult location, and has little real relation with Leucosia : it is more nearly allied to some of the arcuated species.] Leiicosia, Fab., has the carapa.\ of variable form, but generally globular or ovoid, and as hard as stone; the lateral antennas and eyes are very small ; the tail, large and suborbicular in the females, is generally composed of four or five, but never of seven segments. Dr. Leach cut up this genus into many others. A very few species belonging to his genus Ebalia are found on the English coast. The majority of the family inhabit tropical seas. The fifth section, Trigona, is of very great extent, and consists of species having the carapax generally irregular or subovoid, and narrowed in front into a kind of beak ; ordinarily very rough and uneven, with the eyes lateral. The epistoma, or space between the antennae and oral cavity, is always nearly square, and as long as broad. The claws, at least of the males, are always large and long. The following legs are very long in the majority, and occasionally the posterior pair have a form dif- ferent from the preceding. The apparent number of joints in the tail varies, being seven in both sexes of the majority of species ; but in others, at least in the males, it is less. Many of these crabs are commonly called sea spiders. Although the number of species of this section are very numerous, only two had been discovered in a fossil state ; one of which, Maia Squinado, exists at the present time in the same localities. Latreille divides this section into sub-sections, from the number of joints in the tail, and the form of the joints of the foot-jaws. Amongst those with the tail, either in both sexes, or in the females, com
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