22 SECOND SUPPLEMENT TO THE CRAG MOLLUSCA. 



Mr. Cavell, of Saxuiundham, which closely corresponds with Pleurot. laevigata, Phil., 

 being quite destitute of cos tse; but the shell cannot be described as " laevissima," as there 

 are vestiges of spiral striae remaining upon the Crag specimen. This is possibly the 

 same as fig. 12, tab. vii, of 'Crag Moll.,' but it is distinct from fig. 15, tab. vi, of my 

 first Supplement, which I think may be referred to P. nebula of Mont. 



Cancellaria (Ad mete) avara ? Say. 2nd Sup., Tab. IV, fig. 5. 



Coltjhbella avara, Say. Gould. Invert. Massach., p. 313, fig. 197. 

 Cancellabia avaba, A. Bell. Ann. and Mag. Nat. Hist., May, 1871. 



Axis, ^ an inch. 



Locality. Red Crag, Waldringfield. 



This is another imperfect and much worn specimen from Dr. Reed's Collection, but 

 as it has been published by Mr. Bell in his list of Crag shells as a species of that forma- 

 tion, I have had it figured as above. I am unable to give a full description of the 

 specimen from its mutilated condition, but it possesses several folds or small ridges upon 

 the columella, from which, and its general form, it seems referable to that group of 

 the Cancellarise to which the subgeneric name Admete has been given, but beyond that I 

 can express no opinion of its identity, and I give it under the name Avara solely on the 

 authority of Mr. Bell. It appears to me like a derivative. I have a very imperfect 

 specimen of an elongated species of Cancellaria from the Coralline Crag, but it is too 

 much mutilated to permit of its being even provisionally described. It does not, 

 however, appear to have belonged to the same species as the above shell. 



Cancellaria crassistriata, A. Bell, MS. Tab. Ill, fig. 16 a, b. 



Axis, \ an inch. 



Locality. Red Crag, Waldringfield 



The figure is taken from one of two debauched specimens from the Red Crag of 

 Waldringfield in Dr. Reed's Cabinet, which were obtained for him by Mr. A. Bell, 

 and who has sent me the following rough note upon them : — " Specimens much 

 worn and decorticated. There are about ten striae on the body whorl, the most 

 prominent being three on the most extended part of the volution, crossed by some 

 broad obscure ribs ; the outer lip is thickened inside at the top ; inner lip reflected 

 upon the pillar, showing in worn specimens an umbilical chink. The absence of teeth 

 on the inner lip would place the shell in the section Admete." Whatever the specimens 

 may prove to be, they are evidently derivative in the Red Crag. 



