124 Mr H. Gootlsir on the Genus Cuma. 



rouglij wliicli is caused by tlic great number of shallow fovcsc with 

 which the. whole surface is thickly covered. This, and the following 

 species, are perhaps the smallest of the genus ; at the same time, they 

 are much thicker and stronger in proportion to their size than the other 

 species. The rostrum is short, thick, and suddenly truncated obliquclj'. 

 The antennse are minute ; the first or superior pair are almost obsolete ; 

 they consist of one joint only, which is rhomboidal ; the extremity of 

 each is armed with several strong but minute hairs or spines ; they 

 arise from the truncated extremity of the rostrum. The inferior an- 

 tennre* arise from the inferior surface and base of the rostrum ; they 

 arc considerably larger than the superior pair ; they are flvc-jointed, 

 the third joint being the longest, the fifth or last is extremely small, 

 and is armed with three very strong pointed and articulated sjiines. 

 These pair of antennas are somewhat longer than the rostrum. The 

 foot jaws are rather powerful, and have a great resemblance to the 

 following pairs of feet. The first, or superior pair, are the smallest ; 

 the first joint is of considerable length, being equal to all the others 

 combined ; it is rather bent and broad, and is armed at its distal ex- 

 tremity with two thumb-like processes or tubercles. Two very long 

 and slender spines, which are almost as long as the foot-jaw itself, 

 arise from the middle part of this scgm.ent ; the external spine is free 

 of spinules altogether, but the internal is armed, on its external edge 

 only, with a great number of articulated spinules. The second seg- 

 ment of this foot-jaw is very short, and its posterior edge bears two 

 very short articulated sjiincs of equal length ; these spines are spini- 

 ferous. The third segment is almost equal in length to the first, and, 

 like the second, also gives rise to nine or ten articulated and spinife- 

 rous spines. The fourth segment is small and rounded, being also 

 armed on its posterior edge with simple spines. The fifth segment is 

 thumb-like, and spinous on its posterior edge. 



The external pair of footjaws arc much larger than the internal ; they arc 

 five jointed, and are armed in the same way as the first pair, except 

 that the external edge of the first segment is armed at regular inter- 

 vals with small tufts of very fine hairs j the extremity of the second 

 segment is also armed with a very long articulated and spiniferous 

 spine. These two extremities just described are in general l^'ing in 

 such a way as to cover the organs of the mouth. t 



The two first pairs of legs are constantly concealed beneath the carapace 

 when the animal is at rest, covering the footjaws and the organs of the 

 mouth, and appear only to be used when the animal is swimming. 

 The anterior or ambulator}' division is five-jointed ; the first joint is 

 about twice the length of all the others combined ; it is considerably 

 bent and very broad ; its internal edge is armed at regular intervals 

 with pennicillatcd tufts of hair ; the three following segments are quite 

 free of spines, but the last is armed at its extremity with a strong claw 

 and two smaller spines. An articulated thumb-like and chelate joint 



* Plate II. Fig. 5. t Tlatc II. Fi-. 7. 



