1. '08. 93 



conclusion that the two species are quite distinct, at any rate 

 in the material preserved at the British Museum. 



P. Leptocerus is most easily recognised from P. Bonnieri 

 by the numerous small crescentic elevations or rugosities, 

 fui'nished with short hairs, that exist all over the body. 

 These are specially conspicuous on the sixth abdominal somite. 

 In P. leptocerus , moreover, all the appendages are evidently 

 more slender than in P. Bonnieri and the lateral process from 

 the basal segment of the antennular peduncle has a slightly 

 different form. 



General disirihution. — Pandalus Bonnieri is known from 

 S. and W.- Norway to lat. 67° 20' N. (rare, Sars, Wollebaek, 

 etc.), from the south of Iceland (Hansen), from the Bay of 

 Biscay (Caullery), and off the Scotch coasts from Loch Long 

 and Loch Fyne (Caiman). 



Irish distrihution. — Abundant in the Irish Sea and off the 

 west coast, but not so far known from the south. 



Vertical range. — Found in 20 to 80 fathoms off the east 

 coast of Ireland and in the Bay of Biscay between 100 and 666 

 fathoms. 



Genus Plesionika, Spence Bate. 



Plesionika martia (A. Milne-Edwards). 

 PL XII. figs. 1-4. 



Pandalus martius, A. Milne-Edwards, 1888, PI. xviii. 



Plesionika semilaevis, Spence Bate, 1888, PI. cxm, fig. 3. 



Pandalus martius, Wood-Mason, 1892. 



Plesionika martia, Caullery, 1896, PL xv, figs 1-6. 



Pandalus martius, Adensamer, 1898. 



Plesionika {Pandalus) Sicherii, Eiggio, 1900. 



Pandalus (Plesionika) martius, Alcock, 1901. 



Pandalus martius, Senna, 1903, PL xiv, figs. 6-13; PL 



XV, figs. 1-4. 

 Pandalus martius, Eiggio, 1906, PL ii, figs. 8-11. 

 Pandalus martius, Eathbun, 1906. 



The rostrum is laterally compressed and from one and a 

 quarter to more than two and a half times the length of the 

 carapace; basally it is depressed and bent downwards, but 

 commences to ascend again before reaching the middle of the 

 antennal scale and from thence to the apex it is quite straight. 



