344 DE. W. T. CALMAX ON NEW OR EAEE 



Family NANNASTAClDiE. 



Genus Cumella. 

 In addition to the specimens described below there are in the collection a number 

 of males of this genus, collected, for the most part, by Dr. Mortensen in the Gulf of 

 Siam, which I am unable to identify with any described species or to allot to any 

 of the females found with them. As in the case of the genus Naiinastacus, I do 

 not attempt to describe these males. 



Key to the Species q/" Cumella (excluding C. molossa Zimmer, not yet figured, 

 but described as closely resembling C. (jracillima) . 



A. Last somite inflated, longer than the preceding. 



a. Legs of last pair about as long as carapace, carpus more than twice 



as long as merus ; pseudorostrum long C. forjicula, sp. n. 



b. Legs of last pair two-thirds as long as carapace, carpus less tlian 



twice as long as merus ; pseudorostrum very short C clavicauda, sp. n. 



B. Last somite not inflated, not.longer than the preceding. 



a. Peduncle of uropods more than twice as long as last somite ; carpus 



of last leg more than three times as long as merus. 



A. Carapace one-fourth of total length ; pseudorostrum well- 



developed ; eye absent ; antennal flagellum of male not longer 



than thorax C. gracilUma Caiman. 



B. Carapace one-third of total length ; pseudorostrum very short ; 



eye present ; antennal flagellum of male nearly equal to length 



of body C. leptopus, sp. n. 



b. Peduncle of uropods less than twice as long as last somite. 



A. Last somite about equal in length to the preceding; carpus of 



last leg three times as long as merus ; peduncle of uropods 



distinctly shorter than last somite C. hi.yjlda, sp. n. 



B. Last somite distinctly shorter than preceding ; carpus of last 



leg less than three times as long as merus ; peduncle of 

 uropods about equal to or longer than last somite. 



a. Carpus of last leg more than twice as long as merus . . . . C. serrata, sp. n. 



b. Carpus of last leg less than twice as long as merus. 



a'. Antero-lateral margin of carapace deeply concave, tlie lower 

 angle prominent. 



1. Tliird free somite with double dorsal tooth (female) . . C. australis Caiman. 



2. Third free somite without dorsal tooth C. yyijmam G. O. Sars. 



b'. Antero-lateral margin of carapace straight, the lower angle 



with a small tooth. 



L Rami of uropods subequal C. lievis, sp. n. 



2. Exopodite of uropods shorter than endopodite .... C /»»zco/a G. O. Sars. 



