64 



J. R. KiNAiiAN on the Britannic Species of 



From allied foreign forms it differs as follows : — From Crangon Francisco- 

 rum in the form of the propodos of chela, which in that species has the palm 

 oblique, and not transverse, as in Cr. vulgaris ; and from Crangon rubropimc- 

 tatus, according to Risso's description, in the presence of the median gas- 

 tric tooth, which is wanting, or at least not described at present, in that species. 



According to a specimen from East Florida, presented by Thomas Say to 

 the British Museum, and marked in his hand as C. septemspinosus, it is identi- 

 cal with that species. 



Although found all round Ireland, I cannot find that it is ever collected for 

 sale. It is sufficiently abundant in Dublin to render it worth while so to do. 



Sub-genus Steiracrangon (mihi). 

 (For characters, vide p. 57, supra.) 



CHANNELLED-TAILED SHKIIIP. 



P1.AT1: TIL 



CR. STEIRACRANGON ALLMANNI — LIFE SIZE. 



n, JOtli and J 1st somites, with posterior picopoils ; I, termination oftclson; c, 1 st cheliped. The spine on nieros is not 

 represented in the figure ; d, rostrum. The hairs which are on its edges are omitted. 



