THE KDKIOI'HTIIAI.MIA 



311 



bered. But the salient characters of tli< irnmp will be best 

 understood by the study of such a genus as AmphithoV, the 

 principal details of tin- orgaiii/ation of which are represented 

 in Fig. 81. 



The body of this animal is compressed, bent upon itself, 

 and divided into fifteen very distinct segments, reckoning the 

 head as the first and the telson as the last. 



FIG. 81 



}. 81. Amphithoe. The letters and figures \\-.\vo the same signification as in other 

 UOTM of Crustacea, except <w. oostriritc : />r. branchiae; C lateral view of 

 stomach (D) opened from above ; a, 6, c, different parts of the armature. 



The head presents a rounded tergal surface ; the anterior 

 face is disposed perpendicularly to the axis of the body, and 



