560 ME. H. N. RIDLEY ON THE 



DlADEMl SAXATILE, L. 



Two specimens from pools at Morro do Chapeo. 

 TEiPKErsTEs EscuLENTrs, Leslce. 



Yerj plentiful in rock-pools in Sponge Bay, sometimes almost 

 filling a small pool. . 



Ophiura cine re a, M. Sf Tr. 

 Common under stones, north side. 



Ophiacantha sp. 



A very small specimen with the preceding. 



Ophiocoma pumila, Luth. 

 Young specimens. 



Ophiocoma echikata, Ag. 



A single specimen from Portuguese Bay. Quite unknown to 

 our guide, so it is probably rare here. 



OLIGOCH^TA. 



By W. Blaxland Benham, D.kSc. 



On [February 2, 1889, I received a tube of small worms, which 

 had been collected by Mr. H. N. Eidley in the island of Fer- 

 nando Noronha, with the request that I would identify them. 

 I gladly undertook to do so, and obtained permission to open 

 the worms, if necessary ; for it is now admitted that in most 

 cases it is almost impossible to pronounce with certainty on the 

 genus of an Earthworm from external characters alone ; and 

 although in some cases external characters may point to some 

 particular genus, yet it is not always safe to rest content with 

 such an indication, and we must examine the internal anatomy 

 in order to be sure of the point. 



The tube which I received contained six small, ill -preserved 

 worms, one of which was a Polychsete, which I did not further 

 examine. Ot the remaining five, the first (which I will call A) 

 was of rather an earthy-brown colour and measured 4 inches 

 in length ; the second and ^ third were similar in colour and 

 general appearance, but were only about 2 inches long; the 

 fourth (B) was of a much darker tint, and was reddish brown in 



