326 



CUMAD^. 



Genus Cuma {Edwards). 



Generic Characters. — The superior antennae are single-jointed, and scale-like ; the 

 inferior antennae are five-jointed. The caudal styles have the double terminal 

 scales biarticulate, the last of which is always the shortest. 



Cuma Edwardsii, mihi. 



C. — With the superior antennre rhomboiJal ; with the ambulatory division of the 

 first pair of legs, with the first joint bent at an obtuse angle ; with the thumb- 

 like process single-jointed, and with the last joints clavate. Length 4 lines. 

 Hab. Frith of Forth. 



Description, — The whole animal is of a fine straw-colour, with a delicate tinge of 

 pink, which is brighter in certain lights ; the shell is quite rough, which is 

 caused by the great number of shallow foveae 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 obliquely. The antennse are minute ; the first or superior pair are 

 almost obsolete ; they consist of one joint only, which is rhomboidal : the ex- 

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

 arise from the truncated extremity of the rostrum. The inferior antennre 

 arise from the inferior surface and base of the rostrum ; they are considerably 

 larger than the superior pair ; they are five-jointed, the third joint being the 

 longest, the fifth or last is extremely small, and is armed with three very strong 

 pointed and articulated spines. These pair of antennaj are somewhat longer 

 than the rostrum. The footjaws are rather powerful, and have a great resem- 

 blance 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 extremity with two 

 thumb-like processes or tubercles. Two very long and slender spines, which 



