ClIAKACTERISTIC DEEP-SEA TYPES. CRUSTACEA. 



45 



tion formed by a projection of its margin and by processes of 

 the external feet-jaws, is capable of a slight motion, a character 

 unknown among* decapods. The hinges of the last three articu- 

 lations of the rings of the tail are modified, so that they can be 



Fig. 242. — Glyphocrangon aeuleatus. \. (S. I. Smith.) 



clamped, and the animal can hold the terminal rings firmly ex- 

 tended as a means of self-defence. 



Sdbinea princeps (Fig. 243), taken in 400 to 700 fathoms off 

 the Atlantic coast of the United States, and a closely allied spe- 



Fig. 243. — Sabinea princeps. \. (S.I.Smith.) 



cies from off Guadeloupe, are the largest known species of the 

 family of Crangonidae, and many times larger than the two 



