24 SECOND SUPPLEMENT TO THE CRAG MOLLUSCA. 



CHEMNITZIA INTERNODULA? S. Wood. Far. ligata, 2nd Sup., Tab. II, fig. 11. 



CHEMNITZIA INTERNODULA, S. Wood. Crag Moll., vol. i, p. 81, tab. x, fig. 6 ; 1st Sup. 



Crag Moll., p. 60, for normal form. 



Axis i%ths of an inch. 



Locality. Eluvio-marine Crag, Bramerton. 



The specimen here represented is in the Norwich Museum, and was sent to me by its 

 curator Mr. Reeve. As it seems to differ so materially in form from the numerous 

 specimens and fragments of infemodula that I have obtained from the Cor. Crag, I 

 have here figured it in juxtaposition, with a representation (fig. 12) of one of my 

 specimens from the Cor. Crag of Sutton. It may have been affected, like the Littorina, 

 &c., by the brackish water, and consequently have much altered its normal form. If it 

 be of the same species I would call it Chemn. internodula, var. ligata; and the latter 

 might be adopted for its specific designation if the shell should prove to be specifically 

 distinct. The only difference, however, that I can see is that the Norwich Crag shell is 

 much less slender, the internodulation being the same. Mr. Crowfoot has sent me 

 several specimens of this species from the Crag found in the Beccles Waterworks Well, 

 which corresponds with the Eluvio-marine of Bramerton. These, though rather more 

 slender than the variety figured above, are yet nearer to it than to the usual Coralline to 

 Crag form. 



CHEMNITZIA SENISTRIATA, JS. Wood. 2nd Sup., Tab. II, fig. 20. 



CHEMNITZIA SENISTBJATA, S. Wood. Quart. Journ. Geol. Soc., vol. xxiii, p. 120, 1877. 



Spec. Char. Testa angustd, subulatd, elongatd^ apice obtusd ; anfractibus 8 9, 

 conve-xiusculis, spiraliter sulcatis, vel siriatis ; striae senis, latis, depressis ; aperturd 

 sulquadrangulatd ; columelld recta, simplici ; labro intus laemgato. 



Axis \ of an inch. 



Locality. Cor. Crag, Sutton. 



This is the shell mentioned by me in the ' Crag Moll./ vol. i, p. 84, as a var. of 

 similis with spiral striae, but no costae. I now consider it as distinct and figure it under 

 the above name. It approaches a shell called Scalaria quadristrata by Dr. Speyer (' Die 

 Conch, der. Casseler. Tert.,' p. 181, tab. xxiv, figs. 7, 8), but the aperture of my shell is of 

 a different form to the one there represented, and it has more numerous striae than that 

 species. The striae upon the specimen now figured are six in number, broad and rather 

 flat, separated by a narrow line, and the volutions are very slightly convex. 



