GLOBE-TROTTERS 153 



flagella. The second antennae have an acicle on the second 

 joint. The third maxillipeds are subpediform, with the 

 third and fourth joints elongate. The first, legs of the 

 trunk are chelipeds ; the three following pairs are well de- 

 veloped, more or less cylindrical, and the last pair are 

 slender, chelate, folded in the branchial chambers. The 

 sternal plastron is wide. The pleon is bent under the 

 trunk, having the first segment small and dorsally fused 

 with the second ; it has appendages only in the female, 

 these being a rudimentary pair on the first segment, and, 

 as a rule, a single one-branched appendage on the left 

 side of each of the four following segments. 



The single family Lithodidae has the characters of the 

 legion. The members of it are found in the cold and tem- 

 perate shallow waters of both hemispheres, but deep-sea 

 dredgings, especially those of the Talisman, have shown 

 that at great depths, even below a thousand fathoms, 

 species occur in the tropics. Thus, it has been pointed 

 out, the Arctic and Antarctic zones are connected by a 

 submarine tunnel of cold water. The genera are not very 

 numerous. One is found in the waters of Great Britain. 



Lithodes, Latreille, 1806, is now represented by several 

 fine species from distant parts of the world. Lit/iodes 

 maia (Linn.) has long been known. It is the devil-crab 

 of the Norwegian fishermen, according to Herbst. Bell 

 calls it the Northern Stone Crab, and is surprised that 

 what he calls its slight resemblance to Maia squi/nn/,, 

 should have caused it to be at times confused with that 

 species. The superficial resemblance, however, is not in- 

 considerable, when the dorsal view alone is regarded. 



O 



The ventral view permits of no confusion or mistake, for 

 in Lithodes the pleou has in the third, fourth, and fifth 

 segments paired calcified plates, the median portion being- 

 membranous with scattered calcareous particles. In the 

 female the plates are greatly developed on the left side to 

 the disparagement of those on the right, producing a want 

 of symmetry akin to that which is found in the Paguridae. 

 The rostrum in Lithodes is spinulose, like almost all the 

 other external parts of the animal. Lithodes histrix, de 



