CHARACTERISTIC 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 aculeatus. f. (S. I. Smith.) 
clamped, and the animal ean 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 Crangonide, and many times larger than the two 
