1909.] 



FROM THE BAY OF BISCAY. 



875 



Male. ' Huxley ' specimen. — The basal joints of the hinder 

 pergeopods differ from those of the female in having the anterior 

 portion much more produced downwards, forming in the 3rd and 

 4th peraeopods, a large rounded pellucid lobe extending consider- 

 ably beyond the level of the posterior expansion, and nearly 

 covering the succeeding joint (text-fig. 279). On the under side 

 of these joints is a slight longitudinal expansion setting out at 

 right angles to the joint, and terminating distally in an acute 

 projection tipped with 3 sensory spines, one of great length. The 



Text-fie-. 279. 



Sliachotropis lielleri Boeck. 

 Fourth perscopod of tlie male, showing the anterioi- lobe of the basal joint. 



basal joint of the 5th perseopod is much larger than the pre- 

 ceding, with anterior and posteiior lobes at the same level, A 

 ciliated hair is found midway on the hind margin of peraeopods 

 3-5, and peraeopod 4 also carries a remarkably long ciliated hair 

 proximally. 



Pleopods. Male. * Huxley ' specimen. — Rami but little longer 

 than the peduncle in the 1st pleopod, half as long again in the 

 3rd ; coupling-spines large, more dentate on the left pleopod than 

 on the right (see figs. 64, 65). The peduncle of the 1st pleopod 



