232 JOURNAL OF CONCHOLOGY, VOL. 9, NO. 8, OCTOBER, 1 899. 



often exposed as - in the last species. In Sowerby's and Jeffreys' 

 figures the tooth is much too prominent ; it is really small, though 

 sharp and distinct. 



O. acuta Jeffr. — Tenby; Scarborough; Doggerbank ; Dornoch 

 Frith ; Stornoway. 



Var. gracilis Marsh. {J. Conch., vol. 7, p. 253, 1893). — Found 

 occasionally with the type, from Jersey to Shetland. It is figured in 

 " British Mollusca " and in Sowerby's " Index" (pi. xvii., f. 4). The 

 Jersey form of this variety has flattened whorls and finer sutural lines, 

 and may easily be confused with a similar form of O. conoidea from 

 the same district. 



Var. attenuata Marsh. {Ibid.) — Guernsey 20 f. 

 This is one of the least variable species in the section. The 

 principal character is the umbilicus, the entrance to which is funnel- 

 shaped, owing to the reflection of the inner lip, but, as in other species, 

 differing in degree. The spiral sculpture can be seen in fresh speci- 

 mens only, and in a good light. The peripheral keel is indistinct in 

 the adult, and the base is always more or less rounded. The suture is 

 sometimes deeply excavated, especially between the lower whorls, and 

 occasionally specimens of the type and of var. gracilis have com- 

 pressed whorls and a shallow suture. Living examples from Torbay 

 are flesh pink, and, like many others of the genus, aged specimens 

 develope a peritreme and a deeper umbilicus. Some are found minus 

 the top whorls and with the opening plugged up ; one from the Clyde, 

 having only two whorls left, still contains the animal ; and there is a 

 dwarf form about one-fourth the size of the type. Examples 

 possessing a grooved aperture must be very rare ; Clark has noticed it 

 from Exmouth, Jeffreys had one from Falmouth, and I have another 

 from the Mediterranean of the var. gracilis. Jeffreys' figure should 

 have a broader base, a more conspicuous umbilicus, and the sutural 

 lines less sloping ; Forbes and Hanley's are better ; and Sowerby's 

 are capital representations of the two extreme forms. 

 (To be continued). 



Clausilia (Alinda) biplicata II. and A. Adams var. alba nov. — Amongst a 

 series of Clausilia biplicata exhibited at the September meeting by Mr. W. Moss, 

 were two examples of a white form which, as I cannot find any previous record of 

 its occurrence, I propose to call var. alba. The specimens, which were alive when 

 taken, have been perfectly cleaned, and are lovely objects ; transparent white, shew- 

 ing under the lens the typical markings quite distinctly. They were sent to Mr. 

 Moss by Mr. G. E. Mason, to whom they were given by a friend who picked them 

 them up near the Thames at Mortlake. where the species occurs in great abundance, 

 associated with a few CI. perversa. Mr. Mason found another living white example 

 on July 5th. — R. Standen {Read before the Society, September 13th, 1899). 



