71 



Species I. 

 Grey Shrimp. — Plate IV. 

 Crangon vulgaris. (Fabricius, not Owen or Dana.) 



Astacus Crangon. Herbst. ii., p. 57, t. xxix., fig. 3, 4 ; Penn. Brit. 



ZooL, IV, t. XV., fig. 30; Miiller, Zool. Dan., pi. civ., fig. 4-10. 

 Crangon vulgaris. Pabric, sup., 410; Lat. Crust., vi., p. 267, t. Iv., f. 



1, 2; Leach, Mai. Urit., t. xxxvii. B. ; M. Edw. Crust., ii., 341; 



Bell, Brit. Crust., p. 256, f.; White, Pop. Brit. Crust., p. 107, pi. 



viii., fig. 2 ; Guerin, Icon. li. A., t. 20, fig. 4. Kin.; Trans. Eoyal 



Irish Academy, vol. xxiv. p. 61. 

 Crangon septemspinosa. Say, Journal, Ac. Sc. Philadelph., i. 246 ; Do 



Kay, Zool. JN'ew York, vi., p. 25, t. 8, f. 24. 



Crangon vulgaris of Dana and of Owen is not this species, but Cran- 

 gon nigricauda of Stimpson : it is found on the south and west coasts 

 of America. 



Rostrum (r), very sJiort, narrow, slightly rounded at apex^ concave 

 above ; ocular notch, and sides of rostrum ciliated ; carapace armed with 

 one median gastric and ttvo branchial teeth {one on each side) ; abdomen 

 smooth, narrowed ; telson triangular, smooth ; second pair of chelipeds as 

 long as the first or third ; 9, external footjciw. 



Distribution: — Great Britain, all round the coast on sandy bottoms. 

 Ireland, generally distributed. Europe, ITorth seas, Mediterranean. 

 America, JN^orth-east coast, Florida. 



Subgenus Steieackangon (Milii), {ajeipa Kpav<^ov). 



Abdominal somites carinated, telson sulcated. British Species, St. 

 Allmanni. 



Species I. 



Channelled- tailed Shrimp. — Plate IT. 



Crangon (Steiracrangon) Allmanni (Mihi). 



Cr. Allmanni. Kin., Proc. I^at. Hist. Soc, Dublin, vol. ii. Trans. 

 E. I. A., vol. xxiv. p. 64, &c. ; A. White Pop. Hist. Brit. Crust., 334. 



Rostrum {d), short, narrow ; apex slightly rounded, hollowed above ; 

 ocular notch ciliated all round ; carapace as Qii. vulgaeis ; sixth somite 

 of abdomen bicarinated, sulcate ; telson hollowed, triangular ; other somites 

 of abdomen smooth ; second pair of chelipeds slender, eq^ualling in length 

 the first and the third pairs. 



a, 20th and 21st somites, with posterior pleopods ; h, termination of 

 telson ; c, first cheliped. The spine on meros is not represented in the 

 figure. 



Distribution. — Great Britain, Shetland, Eev. A. M. [N'orman. Ire- 

 land, N"orth-eastern coast, Belfast ; East coast, Dublin. 



