16 



Gen. 2. ParatanaiS, Dana, 1852. 



Generic Characters. — Body of female linear, more or less elongated, of male 

 much shorter and stouter. Cephalosome and metasome in both sexes normal. 

 Eyes distinct, being much larger in male than in female, superior antennae in 

 female conical, 3-articulate, in male much more fully developed, consisting of a 

 Particulate peduncle and a well-defined 4-articulate flagellum densely clothed 

 with sensory filaments. Mandibles well-developed and of a structure similar to> 

 that in the preceding genus. Oral parts in male, with the exception of the 

 maxillipeds, abortive, epistome greatly produced. Chelipeds in both sexes nor- 

 mal and not very dissimilar, hand oblong oval, fingers comparatively short. 

 Pereiopoda of moderate size, 1st pair slightly differing from the others, and having 

 the dactylus setiform, the 3 posterior pairs much stronger than the 2 prece- 

 ding pairs, though having the basal joint not much tumefied. Pleopoda all well 

 developed, being comparatively larger in male than in female. Uropoda small, 

 biramose, rami subequal and biarticulate. Incubatory pouch normal. 



Remarks. — This genus was established in the year 1852 by Dana, to in- 

 clude a small Tanaid from the Sooloo Sea, P. elongatus. Several species have been 

 subsecpiently adduced to this genus, but the greater part of them are in my 

 opinion evidently generically distinct, and at the present time only a single 

 additional species is to be noted, viz., the one described below. The genus is 

 somewhat intermediate in character between the genera Leptochelia and Typhlo- 

 tanais, though differing in some points rather markedly from both of them. 



Paratanais Batei. G-. 0. Sars. 



(PI. VII.) 



Paratanais Batei, G-. 0. Sars, Revision af Gruppen Isopoda chelif'era, p. 32. 



Syn: Paratanais forcipatus, Sp. Bate (not Lilljeb.) 



Specific Characters. — Body of female about 5 times as long as it is 

 broad, slightly tapering in front and behind, that of male much shorter and 

 conspicuously constricted in the middle. Cephalosome in female gradually tapering 

 anteriorly, with the frontal margin slightly angular in the middle; that of male 

 not having the anterior part prolonged; ocular lobes in both sexes imperfectly 

 defined. Metasome in female scarcely as broad as the mesosome and furnished 

 laterally with scattered hairs, terminal segment about the length of the 2 preceding 

 ones combined, and evenly rounded at the tip. Eyes in female comparatively 

 small, though distinct, in male very large, oval, with numerous refracting cornese. 

 Superior antennae in female shorter than the cephalosome, basal joint somewhat 



