478 G. 0. SARS, 



Gen. Iphigenella '), Giimm. MS. 



Generic Characters. — Body ratlier stout, smooth, witli compcarativt'ly 

 large coxal plates. Superior anteun<e longer than the inferior, and pi'ovided 

 with a well-developed accessory appendage. Oral parts on the whole normal. 

 Gnathopoda in both sexes very unecpially developed, the anteripr ones rather 

 powerful, with the propodos very large, the posterior slender and feeble, 

 witli tlie propodos sub-linear. Pereiopoda comparatively short and stout, 

 especially tlie 3 postei'ior pairs, propodal joint in all of th(;ra sub-cheliform, 

 basal joint of the 3 ]iosterior pairs lamellarly expanded, that of last pair 

 somewhat differing in shape from that of the 2 preceding pairs. Last pair 

 of uropoda not very large, outer ramus spinous, inner very small, scale-like. 

 Telson rather narrow, and cleft to the base. 



Remarks. — The most prominent feature of tliis genus, established by 

 Dr. Grimm, is undoubtedly the peculiar prehensile character of the pereio- 

 poda, whicli would seem to point to a semiparasitic nature of the animal. 

 Also the structure of tlie gnathopoda is peculiar in the very une(iual de- 

 velopment of the 2 pairs. Besides the typical form described below. 

 Dr. Grimm has refericd anotiier specic^s to the same genus, under tlie name 

 of Tphigeneia ahyssornm. But the si)ecimens of tliis form contained in the 

 collection are evidently quite immature, and do not at all agree with the 

 charactei's of the genus. 



21. Iphigenella acanthopoda, Grimm. MS. 



(PI. 12, tigs. 1 — 17). 



Specific Cliaraders. — Body moderately compressed, with the back 

 evenly vaulted and smooth throughout. Lateral lobes of ceplialon sub-angular 

 in front. Anterior pairs of coxal [jlates much dee])er than tlie corres])oiKling 

 segments; 1st pair sub-angular in front, 4tli pair much deeper than they are 

 broad. Last pair of epimeral plates of metasome acutely produced at the 

 lateral corners. Urosome with the 2 anterior segments somewhat raised 

 dorsally. Eyes of moderate size, oval in form. Superior antenna' more 

 slender and less densely setous than the inferior, peduncle rather short, 

 accessory appendage 4-articulate. Anteiior gnathopoda with the propodos 

 very large, oval triangular in form, palm somewhat oblique; posterior ones 

 with the propodos longer than the carpus, and edged with fascicles of slender 

 bristles. The 2 anterior pairs of pereiopoda somewhat more slender than 



1) As the name Iphigeneia. proposed by Dr. Grimm, has been long ago appropriated in 

 Zoology, I have felt justified in changing it in the above manner. 



■I'li-i.-Mar. cip. 308. $8 



