32 Mr. W. T. Caiman on 



form characteristic of the female, while tiiat 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 sj)ecimen 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 

 mosciilina is about half the length of the appendix interna. 



The teJson 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 30-70 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. 0. Sars. (Pis. I.-IV. fig. 2.) 



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

 Lofoten," Vidensk. Selsk. J'orh. Christiania, 1869, p. 148; id. 

 " Undersogelser over Hardangerfjordeiis Fauna," Vidensk. Selsk. 

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

 ington, iii. p. 437 (1881) ; id. Bull. Mus. Cunip. Zool. Harvard, x. 

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

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

 Edwards, Recueil de Figures de Crustac^s nouveaux ou peu connus 

 (1883). 



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

 tagni 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 \n some 

 specimens much more slender and turned forwards than in 

 P. Montagui. 



The flagella of the antentiules 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 seta3 on its anterior 

 edge. 



The shape of the antennal scale (PI. II. fig. 2, i) 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 



