120 



son makes no mention of spines on the other segments of the abdomen. 

 They were evidently broken off in his specimen, as they are on some of 

 the segments of the present specimen, which, however, shows a greater 

 number than he states to be present. No evidence of spines were seen on 

 the first and second segments ; but at the posterior extremity of the dor- 

 sal surface of the third is fin erect spine, similar to the one on the posterior 

 extremity of the carapace. The sixth segment has an oblique spine at its 

 extremity, which is smaller than those on the two preceding segments. 

 An unmutilated specimen will doubtless show the first and second' seg- 

 ments to be armed with erect spines similar to that on the third, and 

 on the extremity of the carapace. 



SEEGIA, Stimp. 

 Sergia, Stimpson, Proc. Acad. Nat. Sci. Phila., 1860 , xii, 46. 



In certain of its characters Sergia recalls Lucifer', while in others 

 it is strongly related to Sergestes. Its own peculiar characters are 

 in its fourth and fifth pairs of feet, which are long; and the dactylus 

 is palmiform. Its body is elongated like Lucifer, but not so atten- 

 uated, and there is the same extension of the antennary segment an- 

 terior to the buccal region, which is carried to so great a degree in Lu- 

 cifer. And again, as in the latter genus, there is a spheroidal auditory 

 body imbedded in the base of the peduncle of the internal antennae. 



SERGIA EEMIPES, Stimp. 



Sergia reniipes, Stimpson, Proc. Acad. Nat. Sci. Phila., 1860, xii, 46. 



Carapace very much elongated, depressed, subcylindrical ; a lateral 

 view shows nearly the same vertical diameter from the front to the 

 extremity of the sixth abdominal segment; the cervical suture distinct: 

 the length of the antennary segment anterior to this suture equals more 

 than half the length of the carapace proper ; no hepatic spine. Front 

 slightly projecting and broadly rounded ; the outer angles, over the 

 eyes, rounded and projecting, shorter than the front. Eye subfungi- 

 form, short, its length less than one-third the length of the carapace; 

 it extends very little beyond the apex of the basal article of the pe- 

 duncle of the inner antennae. Antennary scale broad, extending nearly 

 midway the last joint of the antemjary peduncle ; inner margin and 

 apex furnished with closely-set plumulose- cilia ; a spine on the outer 

 margin below the apex. 



