Crangon and Galatliea. 65 



Crangon (Steiracrangon) Allmanni (Nobis). 



Cr. Allmanni. Kin., Proc. Nat. Hist. Soc, Dublin, vol. ii , &c. ; A. White 

 Pop. Hist. Brit. Crust., 334. 



Rostrum short, narrow ; apex slightly rounded, hollowed above ; ocular notch 

 ciliated all round ; carapace as Cr. vulgaris ; sixth somite of abdomen bicari- 

 nated, sulcate ; telson hollowed, triangular ; other somites of abdomen smooth ; 

 second pair of chelipeds slender^ equalling in length the first and the third 

 pairs. 



Rostrum nearly as long as eyes, and slightly longer than the external angles 

 of the orbits, rounded at the apex, hollowed above; orbits moderate, ciliated 

 all round ; the carapax resembling that of Cr. vulgaris, as do likewise the an- 

 tennse and external maxillipeds. 



Abdomen tapering, but more robust anteriorly, aiid more contracted poste- 

 riorly, than Cr. vulgaris ; the first to fifth somites perfectly smooth above ; the 

 sixth bicarinatcd ; carinte smooth, destitute of teeth. 



The telson long, triangular, hollowed above at its base, pointed at the apex, 

 bearing four lateral articulated spines, and a series of small apical ones. 



Colour pellucid-grey, with dark -brown and gold-coloured dots and blotches. 



Lemxth one to two and a half inches. 



Habitat sa.ndy and gravelly bottoms, in from ten to twenty-five fathoms. 



Habits those of common shrimp. I have never taken it except in the 

 dredge. 



Localities, Dublin, on Scallop bed, whence I first established the species in 

 1850 ; here it occurs abundantly. Belfast, off the Gobbins. 



In ova during the summer months ; colour dirty greyish. 



This species has been, doubtless, confounded with Cr. vulgaris. In the 

 Belfast Museum I find specimens thus named and marked in the late "William 

 Thompson's handwriting, as obtained at " Fort WiUiam, near Belfast." 

 When better known, the above list of localities will be, doubtless, much in- 

 creased. 



