21 



narrower than the inner, both articulations equal in size. Body in female 

 whitish, semipellucid, each of the segments of the mesosome having 2 irregular, 

 juxtaposed patches of a light yellowish colour derived from some opaque matter 

 lying inside the skin; that of male slightly variegated with a pale brownish pig- 

 ment. Length of female 2.00 mm., of male 1.50 mm. 



Remarks. — This form, at first sight, looks rather like T. tequiremis 

 Lilljeborg, to be described below, but is found, on a closer examination, to differ 

 in the structure of the superior antenme, the posterior pairs of pereiopoda, and 

 the uropoda. It is also rather inferior in size. 



Occurrence. — I found this species, many years ago, rather plentifully 

 in the harbour of Vadso at a depth of 30 fathoms. Male specimens occurred not 

 infrequently together with the females, and could of course with perfect certainty be 

 referred to this species. Otherwise it is a matter of great difficulty to refer male 

 specimens to their respective species, not only because they differ very markedly 

 from the females, but because they exhibit a perplexing mutual similarity. 



4. Typhlotanais aeqviremis (Lilljeborg). 



(PI. X, fig. 1). 



Tanais aqviremis, Lilljeborg, 1. c. p. 21. 



Syn: Tanais depressus, G. 0. Savs (olim). 



Specific Characters. — 9- Body linear, more than 6 times as long as it is 

 broad, and pronouncedly depressed, with the cephalosome rather short, but little 

 longer than it is broad. First free segment of mesosome shorter than the others, 

 which are rectangular in form. Metasome scarcely longer than the last 2 seg- 

 ments of mesosome combined, and of equal breadth throughout, terminal seg- 

 ment comparatively short, and obtusely truncated at the tip. Superior antenna' 

 about the length of the cephalosome, conically tapering, basal joint somewhat 

 longer than the other 2 combined. Chelipeds comparatively strong, hand larger 

 than usual, attaining the length of the carpus, and oblong oval in form, fingers 

 about the length of the palm. 1st pair of pereiopoda considerably longer than 

 the 2 succeeding ones, which are rather small; the 3 posterior pairs very robust, 

 with the basal joint exceedingly tumefied, and the carpal joint quite smooth, not 

 produced inside. Uropoda very short, but little longer than the terminal segment 

 of the metasome, rami subequal in length, the outer one distinctly biarticulate 

 and terminating in a rather strong seta, inner ramus uniarticulate, though 

 sometimes with a very slight indication of a subdivision beyond the middle. 

 Length 3.10 mm. 



