GASTEROPODA. 35 



the one previously figured. Dr. Homes represents the lip as deeply sinuated above the 

 keel. 



Pleurotoma crispata, Jan. Supplement, Tab. VI, fig. 13. 



Pleurotoma crispata, Jan. Catal., p. 9, No. 25, fide Bellardi. 



— — Bellardi. Mon. Pleur. Foss. Pied., p. 69, Tab. IV, fig. 2, var. 



A. papillosa. 



— Homes. Foss. Moll., Vien., vol. i, p. 367, t. xxxix, fig. 13. 



Locality. Cor. Crag, Ramsholt. 



Spec. Char. PL " Testa turrita, spira elata, anfractibus convexis medio carinatis, 



postice concavis, longitudinaliter arcuatim striatis, anlice convexis, transversim grosse 



striatis sub cost atis ; striis aquidistantibus in primis 1 vet 2 in ultimo perplurimis usque ad 



canalem regulariter decressentibus, carina simplici ; sutures marginatis, margini simplici, 



jiliformi ; canali brevi, conforto, apertura, ovata." — Bellardi. 



This shell was found by myself some years ago in the Coralline Crag, at Ramsholt, 

 and as it has a sub-nodulous keel upon the upper whorls, it was (with other forms which 

 I have now separated) regarded as a variety of the shell figured under the name of P. 

 semicolon in ' Crag Moll.,' vol. i, p. 54. I now think it is specifically distinct, and have 

 referred it to Bellardi's var. carina nodulosa of P. crispata, Jan. The sinus, as shown 

 by the lines of growth, is broad, and curving from the keel to the suture, below which is 

 a small ridge. The apex of my shell is obtuse and smooth, and the aperture is rather 

 shorter comparatively than the species to which it is referred. 



Pleurotoma Icenorum, S. Wood. Crag Moll., vol. i, p. 54, Tab. VI, fig. 3 a (as PL 



semicolon). 



Localitg. Coralline Crag, Orford and- Sutton. 



In the ' Crag Moll.' this shell was doubtfully referred as var. a of PL semicolon, a 

 Lower Tertiary species. Since then I have seen and found more and better specimens, 

 which satisfy me that the Crag shell is quite distinct from semicolon ; a view shared by 

 Mr. Edwards in his 'Eocene Mollusca Univalves ' (p. 244). I should have been inclined, 

 from Basterot's figure of PL denticula, to refer the Crag shell to his species of that name ; 

 but another widely spread Eocene shell is described by Mr. Edwards under the name 

 PL denticula (' Eocene Moll. Univalves,' p. 236), and considered by him to be identical 

 with Basterot's species. As the Crag shell is clearly distinct from the shell thus 

 identified by Mr. Edwards with PL denticula, Bast., there seems no alternative than to 

 assign it another name as a new species, which I have accordingly done as PL Icenorura. 

 It appears to be intermediate between denticula and galerita. 



