Crangon and Galathea. 



73 



doubt of its specific distinctness, as at tlie same time I captured specimens of 

 Ch. sphiosus of the same size, in which the characters of that species were fully 

 shown. It was first described as new at the meeting of the Natural History 

 Society of Dublin, held in December in the same year, and a brief description 

 of it published : it is now for the first time figured. 



It diflers from Cher, spinosus in the comparative shortness and form of the 

 rostrum, in the smoothness of the posterior part of the branchial regions, and 

 the greater degree of smoothness of carapace generally ; in the smoothness of 

 the anterior somites of the abdomen, and the ciliation of the ocular notch. 



From Ch. bispinosus and trispinosus it is easily distinguished by the charac- 

 ters of the carapace. 



From JEgeonfasciatus and sculptus the form of the beak at once separates it. 



I have coupled with it the name of Robert Patterson, Esq., F.R.S., well 

 known for his long and useful study of the Natural History of Belfiist. 



SPINOUS SHRIMP, 



Plvte TII. 



CHERAPniLUS SPINOSUS. — LIFE SIZE. 

 T. rostrum. 9. external maxillipeds. 10. first cbeliped. 



