422 W. T. Calman 



referred to this species (Fisheries Ireland Sc. Invest. 1904 N: 1 

 [1905] p. 33). The Irisb specimens are smaller in size and tlie 

 texture of the carapace iu adults and youug of both sexes is coarsely 

 "cellular" as iu the adult males described above. The median 

 dorsal spine in all the specimens which bave preserved it unbroken 

 is bitìd at the tip while in the few perfect Mediterranean specimens 

 it is simple. I can observe no other dififereuces, but the Irish 

 specimens are coated with mud and not in a favourable state for 

 examination. For the present they may be referred to the same 

 species. 



Occurrence. — Stations 18, 25, 26, 39, 44, 57. Depth 200— 

 HOC metres. 



Procmtipylaspis JSonnieri n. sp. (pi. 27 tig. 21 — 27). 



Description of adult Female (fig. 21 and 22), total leugth 

 2.3 mm. 



Carapace a little more than Ys ^^ total leugth, inflated, 

 narrowed in front as seen from above, Seen from the side the 

 dorsal outline is moderately arched, with a slight depression near 

 the posterior end. The pseudorostrum is a little longer and more 

 acute than in P. armata. The antero-lateral corner is serrated with 

 three or four fine teeth. There are no teeth or spines on the sur- 

 face of the carapace. There is no distinct ocular lobe. The cephalic 

 lobe is produced into a small triangulär median process in front of 

 which the lateral plates meet for the whole length of the pseudo- 

 rostrum. 



The first and second leg-bearing somit es are produced dorsally 

 into bifid laminar teeth like those of P. annata., that of the second 

 somite however being curved forwards like the first. The pleural 

 plates of the thoracic somites are expanded, rouuded aud unarmed. 



The abdominal somites are smooth. The penultimate 

 somite (fig. 23) is widest at about its anterior third, narrowing in 

 front and behind. 



The peduncle of the uropods (fig. 23) is equal in length to 

 the last two somites together and is IV2 times as long as the endo- 

 pod. The latter bears three spines on its inner edge and the 

 terminal spine is long and curved. The exopod is little more than 

 3/4 the length of the endopod. 



Adult male (figs. 24 and 25), total length 2.3 mm. Resembling 

 in general form the male of P. annata. The posterior part of the 



