164 PYRAMIDELLIDvE. 



(from Shetland) represents even a larger size. I regard 

 the typical form as southern or inhabiting shallower 

 water, and the variety as northern or inhabiting greater 

 depths. 



This may be the Turbo simillimus of Montagu, which 

 he described from a specimen (probably a bleached and 

 worn one) said to have been found by Laskey on the 

 shores of Jura although he omitted to notice the in- 

 terstitial striae. It is the Pyramis crenatus of Brown, 

 Chemnitzia fasciata of Requien, and Turritella Danmo- 

 niensis of Leach, whose Turbonella Hibernica may be 

 the variety. 



With respect to the species described by me in the 

 ( Annals and Magazine of Natural History ' (ser. 2. ii. 

 p. 347) as O. formosa, and well figured by Forbes and 

 Hanley (pi. xciii. f. 5) as Chemnitzia formosa, I am 

 bound to say that I am not satisfied about the origin of 

 the specimen on which the description and figure were 

 founded. I received it from the late Mr. G. B. Sowerby 

 as having been collected at Shellness in Kent ; but I 

 suspect that he was misinformed, and that the shell is 

 exotic. The other specimens which I referred to this 

 species are O. rufa, var. fulvocincta. O. formosa is cer- 

 tainly distinct, however, from any other known species ; 

 it is remarkably slender, with flattened whorls and a 

 deeply channelled suture, which makes the spire appear 

 scalariform. T 



\\^k 30. O. 



Turbo lacteus, Linn. S. N. p. 1238. Chemnitzia elegantissima, F. & H. 

 iii. p. 242, pi. xciii. f. 1, 2. 



BODY clear white : mantle even, with hardly a trace of the 

 usual branchial fold : snout or upper flap -skin (mentura) deeply 

 grooved in the middle on the tipper surface, and entire at the 



* Milk-white. 



