ISOPODA. 



NOmiALIA. 



LEPTASPIDIA BREVIPES. 333 



ASELLID^. 



LEPTASPIDIA BREVIPES. 



Sj^ecific cliaracter. Cephalon large, semicircular, with a slight depression 

 in the middle of the anterior margin, its postei-ior lateral angles rounded. 

 First segment of the pereion -ndth the fore margin emarginate, for the reception 

 of the hind part of the head ; lateral margins of the segments of the body 

 entire, rounded, and ciliated. 



Length, one-twentieth of an inch. 



We are only acquainted with a single individual of the 

 single species upon which we have established this genus, 

 the specific characters of which cannot consequently at 

 present be distinguished from the generic ones, and as our 

 specimen was sent to us mounted for the microscope, we 

 have not had sufficient opportunity of observation to 

 allow us to detail the precise structure of the several 

 parts. The antennae are implanted on the under surface 



