CHARACTERISTIC DEEP-SEA TYPES. CRUSTACEA. 4.") 



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 aculeatus. \. (S. I. Smith.) 



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

 tended as a means of self-defence. 



Sabinea 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 



