34 NEW-YORK FAUNA — CRUSTACEA. 



GENUS GONODACTYLUS. Latreille. 

 General shape of the preceding genus, but the enlarged jaw-feet not toothed along their edges. 



GONODACTYLUS SETIMANUS. 

 PLATE VIII. FIG. 23. 



(CABINET OP THE LYCEUM.) 



Description. Shield oblong, with its side much elongated ; a transverse lunate suture on its 

 lower portion in front, with two spinous projecting teeth covering the ophthalmic ring. Inter- 

 nal antennae long, smooth, and furnished with plumose setae ; external shorter, bifid at their 

 extremities, which are articulated. The penultimate segment of the jaw-foot is flattened, 

 carinate on its upper margin, dilated and furnished with long plumose setae ; beyond this are 

 three segments gradually diminishing in size to the last, which is oblong-oval, plumose on 

 both margins. First two pair of feet didactyle ; the two following with the terminal joints 

 fiat and rounded, the edges ciliated. The penultimate abdominal segment slightly arcuated, 

 without spines, and with three rounded unarmed fins on each side, of which the inferior is 

 largest. 



Color, greyish ; tips of the claws of the anterior pair, ciliae on the extremities of the others, 

 and the fins, black. 



Total length, 3 ' 2 ; of the anterior pair of feet, 1 ' 5. 



This species was obtained from the stomach of a Cod-fish in the market. I have to regret 

 that it was too much mutilated to enable me to present its' characters more in detail. It is 

 only provisionally placed here, for in many particulars it is much more nearly allied to the 

 family ErichthidaL. 



