394 CRUSTACEA [October, 



Gems CYMOTHOX. Fahr. 



Abdomen and /az7 composed of six segments, narrower 

 tlian the trunk, the ultimate one larger, and furnished on 

 each side with two compressed, pedunculated scales; 

 feet similar, with very robust, entire nails, coxae large and 

 conspicuous, resembling an accessory lateral articulation 

 of the thoracic segments. 



SPECIES. 



1. C. ovalis^. Body ov^l, eyes concealed, head Tutievt' 

 uated and rounded before; tail terminal segment as long 

 as the five preceding ones conjunctly, rounded at tip. 



Inhabits the mouths of Percce, &.c. 



Cabinet of the Academy. 



Body glabrous, nearly oval; first segment longest, 

 fourth and fifth broadest, those of the abdomen and two 

 first of the tail nearly equal, gradually narrower and round- 

 ed with the curve of the body, ultimate segment of the tail 

 rather narrower than the preceding one and as long as the 

 four preceding ones corijunctly, rounded, at tip and en- 

 tire; styles not surpassing the line of^t^e tip, equal, hardly 

 longer than the peduncle, the inner one oval; feet^ fourth, 

 fifth, and sixth pairs largest, then the seventh, the ante- 

 rior ones gradually smaller to the first pair, which are 

 smallest. 



Length one inch, breadth rather more than half an inch. 

 ^ This species is often found attached within the 

 mouths of salt water fish in our markets, more particu- 

 larly, I believe, in those of the Perch [Perca America- 

 na-\, Bloch) and Black-fish [Labrus AmericanusX, Bloch)y 



\ Described subsequently by Dr. Mitchill under the nanne of Bocliarmo nifus, 

 t Deac/ibed subsequently by Dr. Mitchill under the name of //• tavto^n. 



