32 



Imt slightly setous. Chelipeds strongly built, with the basal joint very large and 

 prominent below, carpus comparatively short and thick, hand somewhat curved 

 and scarcely expanded in the middle. 1st pair of pereiopoda much larger 

 tban the others. Pleopoda rather fully developed. Uropoda short, biramous. both 

 ranii biarticulate and very unequal in size. Incubatory pouch normal. 



Remarks. The present new genus is founded upon the form recorded 

 by the present author at an earlier date, as Leptognathia laticaudata, which, on 

 a closer examination, has proved to differ very materially, especially in the struc- 

 ture of the oral parts, from the species of that genus, and therefore ought more 

 properly to be regarded as the type of a distinct genus. The unusually large 

 and broad metasome together with the strongly-built chelipeds and the compar- 

 atively robust form of the body, somewhat recall the genus Tanais; but the 

 oral parts are very different, and the metasnme is composed of the normal num- 

 ber of segments. The genus contains as yet but a single species. 



Tanaopsis latieaudata, G. 0. Sars. 



(PL XIV, fig. 1) 

 Leptognathia Jnticaudata, G. O. Sars, 1. c. p. 43. 



Specific Characters. 9- Body linear, somewhat depressed, not much 

 more than 6 times as long as it is broad, with the segments marked off by very 

 narrow constrictions. (Vphalosome scarcely longer than it is broad, and consider- 

 ably narrowed anteriorly, frontal margin subangular in the middle. The first 2 

 segments of rnesosome much shorter than the others, which are rectangular in 

 shape. Metasome about half the length of mesosome, but considerably broader, 

 being rather dilated in the middle, terminal segment well developed, pentago- 

 nal in form, tip obtusely angular. Superior antennae about the length of the 

 cephalosome, terminal joint rather slender equalling in length the 2 preceding 

 ones combined. Inferior antenme with the penultimate and antepenultimate 

 joints of the peduncle somewhat expanded and each having above a strong bristle. 

 Chelipeds very strong, with the hand considerably longer than the carpus, and 

 having inside a transverse row of small bristles, fingers about the length of the 

 palm, the movable one serrated along the outer edge, the immovable one terminat- 

 ing in 3 strong denticles. 1st pair of pereiopoda considerably longer than the 

 others, with the propodal joint conically produced, and the dactylus very slender, 

 setiform; the 3 posterior pairs rather strongly built, with the basal joint moderately 

 tumefied, and the meral and carpal joints each provided inside with a single 

 very small denticle. Uropoda not nearly attaining the length of the terminal 



