nxTCF.riTATjn.T:. 341 



Fam. 5. OXYCEPHALID^. 



Animal lone;, narrow. Cq)halou not liroad, lone:, antoriorly pro- 

 duced bi'yond the antennas. Eye8 tilling but a 2)ortion (tf the ccjiha- 

 lon. Antennae on the inferior surface of the cephalon. Gnathopoda 

 small. 



This family may be conveniently divided into two subfamilies. 



Subfam. 1. SYNOPIADES. 

 Having the eyes placed anteriorly to the superior antennoD. 



1. SYNOPIA. 

 Synopia, Dana, U, S. Exjilor. Exped. p. 994. 

 " Front subacute. Antennte long, and not concealed. First pair of 

 gnathopoda [complexly] subcheliform ; second pair vorgn'fonn. 

 First two pairs of pcreiopoda subprehensilo, having the propoda 

 and dactyla capable of being inflected against the cai'pi ; other 

 pail's of moderate size, unguiculate." — Dana. 



1. Synopia ultramarina. (Plate LIV. fig. 1,) 

 Synopia ultramarina, Dana, U. S. Explor. Exped. p. 995. pi. 68. 



" Body compressed, triangulate in front, sides of the head diverging 

 at an angle of oO° or 00°. Superior antennae half the length of 

 the inferior ; flageUum setose at base : inferior antenna) nearly as 

 long as the body and very slender. Gnathopoda and first two pairs 

 of pcreiopoda ciUate below : first pair of gnathopoda smallest, meros 

 hardly longer than the ischium, carpus broad and oblong, pro- 

 podos small and nearly obovalc, dactylos minute : second pair of 

 gnathopoda slender, ending in two rather long setae. Second pair 

 of pcreiopoda rather stout, stouter than the first ; cai^pus broad 

 and a little oblong, oblique at apex ; dactylos short : three poste- 

 rior pairs nearly equal ; setu) few and short : basa of fifth and 

 sixth pairs bi'oad, roundish ; of seventh pair narrower, the apex 

 behind triangulately prolonged, subacute. Caudal stylets slender, 

 the intermediate pair shortest. 



" Length ^th to -j^^th of an inch. 



<' Hah. Atlantic, in latitude 8°-12° S., longitude 1 1"-14 1° W., col- 

 lected May 1842; also in latitude 4°-7° S., longitude 21°-25° W., 

 November 1838."— />«»«. 



