5288 Crustacea. — Radiata. 



spine externally. In the present species the central caudal plate is 

 very short, not being more than half as long as the second plate, and 

 the bifurcation is very deep ; while in M. Chamelion the central plate 

 is nearly as long as the second, and the bifurcation shallow. In addi- 

 tion to these, which I shall call the specific distinctions, there are 

 numerous others of smaller importance, such as differences of propor- 

 tions in different parts, which would be unappreciable in description ; 

 and these together have induced me to separate this into a specific 

 position. 



R. Q. Couch. 

 Penzance, September 15, 1856. 



Thesia Polita at the Isle of Herm. — This very rare crab, of which three specimens 

 only are recorded by Bell as having been found in Great Britain, is occasionally taken 

 in the Isle of Herm : it there occurs in sand at low water on the Long Beach. — Alfred 

 Merle Norman; Kibworth, September 3, 1856. 



Hippolyte Spinus off Oban. — I believe that this, the handsomest of the Hippolytes, 

 is not scarce off Oban : T took a specimen the only day I ever dredged in that splendid 

 locality, and have seen another which was taken there by Mr. Templer. It occurs in 

 deep water, muddy bottom, between Kerreza and Mull, on the ground which is usually 

 dredged for Nucula decussata, the white variety of Turritella communis, &q. 

 Crangon spinosus occurred in the same locality. — Id. 



Note on Comatula rosacea. — Comatula rosacea, the only British representative of 

 the Crinoideans, is generally considered rare. I believe that this is an error: although 

 nowhere abundant or gregarious, as many other star-fish are, it seems generally 

 distributed all round our shores. The following list of localities, only gathered from 

 Forbes, the 'Zoologist' of the last half-dozen years, and my own experience, will go 

 some way to prove this: — 



England. — Penzance; Falmouth; BudleighSalterton ; Weymouth; Milford- 



Haven and other parts of Wales ; Redcar. 

 Scotland.— Firth of Clyde ; Oban; Orkney; Shetland; Moray Firth. 

 Ireland.— Irish Sea; Dublin; Cork; Strangford Lough ; Down; Antrim. 

 Channel Isles. — Guernsey; Herm. 



The names printed in Italics are those of places in which I have myself taken the 

 Comatula. — Alfred Merle Norman; Kibworth* September 3, 1856. 





