— i8 — 



Remarks. — It is after long délibération that I establish this 

 species. It is so closely allied to T. pectinata tbat one may be 

 inclined to consider it a variety. But I have seen 8 spécimens, 

 among which two adult maies, and of T. pectinata a large 

 number from the boréal part of the Atlantic is preserved in the 

 Copenhagen Muséum. T. pectinata is nearly twice as long as 

 T. distinguenda ; besides a less than half-grown spécimen from 

 stat. 1639 of the former species could be separated with certainty 

 from not full-grown spécimens of the latter form. In order to 

 avoid confusion I must therefore, at least provisionally, establish 

 T. distinguenda as a separate species ; when more material has 

 been examined the question can be reconsidered. 



7. Thysanopoda lateralis, n. sp. 



(Figs. 14-16). 



Description. — The carapace has no marginal denticles, but 

 above its latéral border a fine ridge runs from the anterior 

 nearly to the posterior end, and this ridge is the upper limit for 

 a linear impression of a certain breadth ; in this way a rim of the 

 carapace is sharply marked off from the remainder ; the rim 

 itself is narrow in front, considerably broader behind the 



Fig. 14. — Carapace with left eye and an- Fig. i 5.-Outline of front end 



tennular peduncle of a female T. of carapace and eye of 



lateralis. the same spécimen, more 



highly magnified. 



middle and becomes narrow again along the postero-lateral 

 margin. A gastro-hepatic groove is wanting. The front part of 

 the carapace is considerably produced, seen from above almost 

 covering the eye-stalks ; the end itself is produced into a com- 

 pressée! curved acute rostrum, the proximal half of which is 

 directed obliquely upwards and forwards, while the distal part 

 is horizontal ; the upper side of the front part of the carapace 



