154 



COHYSTIDJB. 



longest ; the whole of the teeth are slightly denticulate. 

 The carapace is granular, moderately elevated, and the 

 regions not very distinct. The orbits are open forwards, 

 and have two fissures in the upper and one in the lower 

 margin, the two former being the boundaries of a small 

 projecting tooth. The anterior pair of legs are large and 

 strong, compressed, and, when at rest, closing accurately 

 against the under part of the body. The outer and upper 

 surface of the wrist is furnished with short lines and warts 

 of minute raised points, and there is a spine on the inner 

 and anterior angle. The hand, which, with the fingers, is 

 incurved, has five longitudinal lines of small raised points, 

 besides similar ones on the superior and inferior margins. 

 The fingers are compressed, curved, slightly toothed, and 

 meet only at the points. The remaining legs are slightly 

 compressed, of moderate length, and the whole are fringed 

 with long hair. The abdomen in the male is five-jointed, 

 nearly linear, slightly hollowed on the sides, the terminal 

 joint triangular : in the female it is seven-jointed, very 

 slender, being three times as long as it is broad, the ter- 

 minal joint elongate and somewhat cordate. 



The colour is reddish white, with red spots ; the anterior 

 feet red, the fingers black ; the hair light brown. 



The carapace of a full-sized male is about an inch and a 

 quarter in diameter ; the female considerably smaller. 



The credit of the discovery of this species is due to Mon- 

 tagu, who found it on the coast of Devonshire, where it 

 has since been found, as Leach observes, in great plenty in 

 deep water. Mr. Couch, in his Cornish Fauna, observes 

 that it is " common in the stomachs of fishes, chiefly cod- 

 fish and rays, from the depth of twenty to fifty fathoms. 

 They must abound at these depths, as I have found more 

 than thirty in a single fish, and almost every ray opened 



