582 



469 



Fig. 253. Thyropus sphaeroma (Claus). 



470 



- Pereopods I are equal to or somewhat shorter than pereopods II; the 

 2nd segment is equal to the 4th and 5th together; the 5th segment is much 

 shorter and narrower than the 4th, and the 6th 2/3 the length of the 5th; 

 the claw is short. The 5th segment of pereopods II is shorter than in pere- 

 opods I and the 6th segment longer. Coxal plate V has a long spiniform 

 process on the inner surface; the 2nd segment is oval and 1.6-1.7 times 

 longer than wide; the distal segments together are somewhat shorter or 

 longer than the 2nd segment; the 5th segment is linear and twice longer 

 than the 4th; the 6th segment is shorter and narrower than the 5th but 1.5 

 times longer than the 4th. The 2nd segment of pereopods VI is almost 

 twice longer than in pereopods V, broad, markedly narrowed proximally 

 and distally, its anterior margin notably concave medially, the posterior 

 margin bulged in the proximal half, and a small oval fissure occurs close 



