17 



exceeding in length the other 2 combined, terminal joint longer than the penul- 

 timate one; those in male attaining almost ' Vs of the length of the body, 1st 

 joint of the flagelhmi very short, discoidal and, like the 2 succeeding joints, having 

 a dense bunch of olfactory filaments. Chelipeds in female somewhat tapering 

 distally, hand a little longer than the carpus, and oblong oval in form, with the 

 fingers much shorter than the palm; those in male slightly differing, the hand 

 being conspicuously dilated in the middle. Uropoda about the length of the 

 last 2 segments of metasome combined, outer ramus a little shorter and narrower 

 than the inner, joints of the rami of equal length. Length of adult female 1.60 

 mm., of male 0.90 mm. 



Remarks. — This form was first recorded by Sp. Bate, but was errone- 

 ously identified by him with Tanais forcipatus Lilljeborg, which belongs to a 

 very different genus. It was therefore necessary to change the specific name, 

 and in 1880 I proposed for the sjiecies the name of P. Batei. From the type 

 species, P. elongatus Dana, it is easily distinguished by its much less slender 

 form, the male especially exhibiting quite an unusually short and thick body. 



Occurrence. — I have met with this form in several places on the west 

 coast of Norway, in comparatively shallow water among the roots of Laminarise. 

 The males, as usual, are far less numerous than the females and, on the whole, 

 look so very different, that they may easily be mistaken for quite a different 

 species. As however, they, were found in company with the females, and 

 no other Tanaid occurred in these places, their true relation could with certainty 

 be affirmed. 



Distribution . — British Isles (Sp. Bate), Mediterranean at Spezia (the author). 



Gen. 3. TyphlOtanaiS, G. 0. Sars, 1880 



Generic Characters. — Body in female more or less elongated, sub-depressed, 

 linear, with the lateral contours almost straight; that of male comparatively shorter 

 and constricted in the middle. Cephalosome of moderate size, narrowly truncated 

 in front, or slightly produced in the middle, with no traces of ocular lobes. 

 1st free segment of mesosome generally much shorter than the others. Me- 

 tasome normal. Eyes wholly absent. Superior antennae in female conically 

 attenuated, 3-articulate, with the middle joint small, the terminal one narrow 

 and elongated ; those in male much larger and of a similar structure to that in 



3 — Crustacea. 



