824 CUMAD.*:. 



sisting of a single scale-like joint, armed with a number of strong 

 spines ; the inferior antennae are five-jointed, being in general very 

 little longer than the rostrum. In Bodotria the superior antennse 

 are altogether obsolete, and the inferior antennae are very short. In 

 A launa, again, we find the antennse more developed ; the superior 

 consisting of a single-jointed peduncle, and a long multiarticulate 

 filament which is covered with hairs. The inferior pair are eight 

 or nine-jointed, and are somewhat larger than the rostrum. The 

 organs of the mouth consist of one pair of maxillse, three pairs of 

 mandibles, and two pairs of foot-jaws. These last organs will be 

 found minutely described under Cuma Edwardsii, the species which 

 I have been enabled to examine most minutely. 



" The true legs may be classed into compound and simple. The 

 compound legs, as we have already stated, are four in number in 

 the genera Cuma and Bodotria ; but six in Alauna. The first, 

 or compound legs, are divided into two parts, the anterior or am- 

 bulatory, and the posterior or natatory. The simple legs are much 

 shorter than the compound, and are more adapted for prehension ; 

 but they are unarmed with claws, and are seldom used for this 

 purpose. 



" The abdomen is moniliform, seven-jointed, in all the genera. 

 The last joint is very small in the genera Cuma and Bodotria ; 

 but in Alauna we find this segment very much developed. All 

 the genera have the sixth abdominal segment armed with a pair 

 of long bifurcated styles. The genera Cuma and Alauna are quite 

 free of appendages to the other abdominal segments ; but in Bo- 

 dotria we find that all the abdominal segments are armed with 

 a pair of bifurcated appendages. 



" Owing to the opacity of the shell, I have not been able as yet 

 to make out the minute parts of the anatomy of these animals. 

 The intestinal canal consists of a long straight tube, considerably 

 dilated as it passes through the thoracic portion of the body; when 

 it reaches the abdominal portion it suddenly becomes much nar- 

 rower. 



" The anal aperture is found in the seventh abdominal seg- 

 ment. 



