- 4 3 - 



mis, but the distal part of the terminal process is far less 

 tubiform. 



The species has about the same distribution as T. iner- 

 mis, thus also found in the Bering Sea and the boreal 

 Pacific. 



T. parva H. J. H. — Antennular peduncles in the 

 female with the third joint slightly or a little longer and 

 somewhat thinner than the second, in the male as long as 

 or slightly longer and a little thinner than the second, but 

 both joints slightly thicker than in the female ; the upper 

 flagellum about as long as the sum of second and third 

 peduncular joint. The copulatory organs (Fig. 14) with 

 the spine-shaped process normal, small ; the terminal 



processes with the same breadth from the middle to the 

 truncate, feebly convex, scarcely serrate end ; the proximal 

 process moderately broad from the middle to the end, 

 with a short terminal part turned somewhat outwards 

 and obliquely truncate, but the inner front angle produced 

 into a small tooth, the distal part of this process in reality 

 showing a strong reduction of the features found in 

 T. gregaria. As to other particulars I refer to Nos. 3o 

 and 42 of this Bulletin. 



Temperate North Atlantic. 



T. gregaria G. O. S. — The antennular peduncles 

 nearly as in T. parva, but the upper flagellum conspi- 

 cuously shorter than the sum of the two distal peduncular 

 joints. Sars has given a good description with figures ; the 



Fig. 14. Thysano'ëssa parva 

 H.J. H. Inner and median 

 lobe of left copulatory or- 

 gan, from behind. pK spine- 

 shaped process ; .p' 2 . termi- 

 nal process; p 3 . proximal 

 process; p'*. lateral process. 



(210) 



