JOURNAL OF CONCHOLOGY. 385 



the first whorls, then gradually becoming flexuous, and the 

 tooth is often visible. Jeffrey's figure is a fair outline of 

 the shell, but it is wretchedly executed, and the dimensions 

 (3 lines) are too long. His largest specimens came from 

 me, and were 2| lines long, but the usual size is 2 lines. 

 Sowerby's figure does not correctly represent any British 

 shell. It is conical in shape, has straight ribs, compressed 

 whorls, and a narrow suture, unlike any of the foregoing, 

 and the length given is a line and a quarter. 



Var. nana Marshall. This form was included in my descrip- 

 tion of 0. pusilla var. viinuscula, but must now be 

 separated. The two dwarfs are as distinct as the types. 

 L. o"oi. B. 0*03. I can record this from Guernsey only, 

 in 20 fathoms. Specimens from Algiers, however, labelled 

 Turbonilla seviicostata de Folin (non O. semicostafa Jeff.) 

 are without doubt the same as this. 



Var. gradata Monts. {^) Without entering on the question 

 whether this is a good species, it certainly is distinct from 

 any of the foregoing. All its characteristics are those of 

 O. imiovata, but that the whorls are turreted or scalariform 

 as in O. scalaris, though not to the same extent. But 

 while O. scalaris is a conical shell, this is cylindrical, as 

 the whorls shelve downwards towards the suture. We 

 have nothing like this form in Britain. 



The East Shetland record of Aira nodulosa Miill., given 

 in my paper, is open to doubt, and must not therefore be 

 relied upon. 



Sevenoaks, Torquay, 

 February, 1894.- 



(i) Enum. e Sin, 1878, p. 33. 



