44 Mr. J. G. Jeffj'eys on British Mollusca. 



Barmouth, where single valves are not uncommon ; Skyc sand. It 

 has somewhat the appearance cf Montacuta hidentata, and may have 

 been overlooked for that species ; but it essentially differs in form 

 and dentition. 



Pisidium nitidum, ii. I'iCi. Barmouth. 



Nucula nitida, ii. 218. Barmouth. 



Leda pygmfea, ii. 230. Shetland sand. 



Area nodulosa, MilU. Prodr. Zool. Dan. p. 247 ; Lovcn, Ind. 

 Moll. Scand. Occid. p. 33. 



I found a single valve of a young individual in Shetland sand ; and 

 it diifers in no respect from Norwegian specimens of Area nodulosa 

 in the British Museum, or from a single valve which Mr. M'Andrew 

 obligingly sent me for comparison, and which he obtained by dredging 

 last year in the North Sea. Loven refers this species, with doubt, 

 to the A. seabra of Poli, and he supposes a variety of it to be iden- 

 tical with A. asj)era of Philippi : but the number of hind teeth in 

 the latter species is described by Philippi to be half as many again 

 (viz. fifteen) as those in A. nodulosa. They may not, however, be 

 specifically distinct. The present sj)ccies may readily be distinguished 

 from A. lactea (which is very variable in form and sculpture) by the 

 position of the beaks, and having comparatively few and differently 

 arranged teeth. 



Lima subauriculata, ii. 263. Arran Isle, Galway {Barlee). 



Pecten furtivus, Lov. (F. & H. ii. 284). Skye [Barlee), with P. 

 striatus. This species differs, in form and sculpture, from all the 

 varieties which I have seen of J*, striatus, many hundred specimens 

 of which, and about a score of P. furtivus, have passed through 

 my hands. It is also a IMediterranean species ; and IM. Costa's col- 

 lection, in the British Museum, from the coast of Naples, contains 

 many specimens of this beautiful shell. 



Anomia ephippium, ii. 325. I agree with ^Ir. Clark in considering 

 A. acideata to be merely a variety of this species ; and I would also 

 unite A. striata of Loven with A. patelliformis. 



Acephala Palliobranchiata, or BracMopoda. 

 Terebratula caput-serpentis, ii. 3o3. Arran Isle, Galway {Barlee). 



Gasteropoda Prcsobrancliiata. 



Adeorbis subcarinata, ii. 541. Barmouth. 



Lacuna crassior, iii. ^7. Not unconnnon in Swansea and the 

 adjacent bays (omitted by Forbes and Ilanley) ; Cleethorpe, lan- 

 colnshire. 



Rissoa rufilabrum, iii. lOG. Barmouth; Shetland sand. 



B. labiosa, iii. 105. Barmouth. 



R. semistriata, iii. 117. Barmouth ; Shetland sand. 



R. rubra, iii. 120. Shetland and Skye sand. 



B. glabrata, Phil. (<ind R. punctulum of same author). I found 

 one adult and two or three immature specimens in the Shetland and 



