32 Mr. W. T. Caiman on 



form characteristic of the female, while that on the left side 

 resembled the second form of the male appendage described 

 above, save that the internal process was rather small and 

 irregularly formed. The specimen in other respects was well 

 developed, and no trace could be detected of Bopyrid or other 

 parasites. In the second pleopods of the male the appendix 

 masculina is about half the length of the appendix interna. 



The telson bears on its upper surface five or six pairs of 

 spinules in front of the large spines at the corners of the 

 truncated tip. 



Size. — Our largest specimen is about 95 millim. in length 

 from the tip of the rostrum to the end of the telson. 



Occurrence. — This species appears to be common all round 

 our coast. It frequently occurs in tide-pools, and we have 

 specimens from 3(3-70 fathoms in Loch Fyne. Records of 

 its occurrence at greater depths in British waters are open to 

 suspicion of possible confusion with one or other of the two 

 species next to be described. 



Pandalus propinquus, G. O. Sars. (Pis. I.-IV. fig. 2.) 



Pandalus propinquus, G. 0. Sars, " Nye Dybvandscruslaceer fra 

 Lofoten," Vidensk. Selsk. Fork. Cbristiania, 1869, p. 148; id. 

 " Undersogelser over Hardangerfjordens Fauna," Vidensk. Selsk. 

 Forh. Cbristiania, 1871, p. 259 ; S. J. Smith, Proc. Nat. Mus. Wash- 

 ington, iii. p. 437 (1881) ; id. Bull. Mus. Comp. Zool. Plarvard, x. 

 p. 58 (1882-83); G. 0. Sars, ''Oversigt af Norges Crustaceer," 

 Vidensk. Selsk. Forh. Cbristiania, 1882, no. 18, p. 47 ; A. Milne- 

 Edwards, Recueil de Figures de Crustaces nouveaux ou peu connus 

 (1883). 



The rostrum (Pi. I. fig. 2, a) is similar to that of P. Mon- 

 tagid and of about the same relative length, but rather 

 deeper and more strongly curved upwards. Above there are 

 8-9 spines, of which three are on the carapace. The lower 

 edge of the rostrum is cut into 5-7 teeth, which are in some 

 specimens much more slender and turned forwards than in 

 P. M on tag ui. 



The flagella of the antennules reach well beyond the tip of 

 the rostrum, the internal flagella being in the specimens 

 examined from once and a half to twice the length of the 

 carapace. The basal lobe is free from setaa on its anterior 

 edge. 



The shape of the antenna! scale (PI. II. fig. 2, b) is very 

 characteristic, being much narrowed anteriorly, where the 

 width is only about one fourth of the greatest width of the 

 scale a little above the base. The tip is transversely trun- 

 cated or slopes a little backwards from the prominent tooth on 



