144 THE BERMUDA ISLANDS. 



distinct forms, as has been averred by Miiller and Troscbel 

 (System der Asteriden, 1842, p. 98), were included by Lamarck 

 in bis species. Two distinct -forms, closely related to eacb 

 other, certainly do occur in the West Indies, one of which, with 

 more blunt arm spines, is clearly Say's species, while the other, 

 with more elongated arm spines, and much less stoutly devel- 

 oped uppermost spine, more nearly corresponds to the general 

 type of Lamarck's species. 



Ophiocoma pumila, Liitken. 



A fragmentary specimen; exact locality unknown. This 

 species had been recorded by the Challenger from Bermuda. 



Ophiostigma isacantha, Say. 



Two very young specimens, dredged in Harrington Sound. 



Ophiactis Mulleri, LUtken. 



0. Krebsii, Lutkenf 



Two very young specimens, dredged on the north shore be- 

 tween Bailey's Bay and Shelly Bay. 



Ophionereis reticulata, LUtken. 



Very abundant at low tide in the rock shelters of Shelly Bay ; 

 also under stones at the entrance to Harrington Sound. 



Ophiomyxa flaccida, LUtken. 



One specimen, dredged in Bailey's Bay. 

 ECHINOIDEA. 



The number of species of echinoids observed by us is six, of 

 which five had already previously been ascribed to the archi- 

 pelago ; Oidaris tribuloides, so far as I am aware, had not 

 hitherto been collected at any rate, I have been unable to 

 find any mention of its occurrence there. One species, Mellita 

 sexforis, we did not ourselves collect, the specimens in our pos- 

 session having been kindly donated to us by local collectors. 



Cidaris tribuloides, Bl. 



Fairly abundant among the coral shelters of the North 

 Rock. 



Diadema setosa, Gray. 



