SECOND SUPPLEMENT 



TO THE 



CRAG MOLLUSC A. 



BccciNUM NUDUM, S. Wood. 2nd Sup., Tab. I, fig. 1 a, b. 



Spec. Char. B. Testa tenui, elongato-ovatd, turritd, lavigatd, apice ohtusd, depressd ; 

 anfractibus sepfenis, conveximculis ; suturd impressd ; aperturd ovatd ; labro tenui acuto, 

 columelld regulariter concavd. 



Axis 2 1 inches. 



Locality. Cor. Crag, Sutton. 



The shell here represented is from the collection of Mr. Canham, who tells me he 

 obtained it from the lower part of the Cor. Crag at Sutton. The shell is very thin and 

 fragile and has lost some small portion of its exterior and a small part of the shell, but it 

 has retained its natural form by the somewhat slight consolidation of the material within. 

 It resembles a shell I figured in ray Snppl., Addendum Plate, fig. 11, under the 

 name of Buc. Tomlinei, but that is not quite so elongated as the present one, and it is 

 ornamented with large and distinct spiral striae ; while our present shell, where the outer 

 coat has been preserved, appears to have been perfectly smooth and very thin. I 

 have a cast of this shell in one of the so-called " box stones '' of the Red Crag. It 

 belongs apparently to a group of shells of which Buc. Balei may be considered as the 

 type ; but it departs as much or more from that species as does the other Cor. Crag 

 shell pseudo-Balei. Both, however, are obnoxious to the same objection that they are 

 founded on solitary specimens. To this objection the extreme rarity in the Cor. Crag 

 of the normal form Balei is to some extent an answer. 



At fig. 5 ff, b, tab. i, of the same plate is represented a specimen which I have referred 

 (with doubt) as a deformity to Buc. undatum ; it somewhat resembles a shell I figured in 

 Sup. to Crag Moll., tab. ii, fig. 5, and considered as a deformed specimen or variety of that 

 species, and I am inclined to think our present shell is in a similar condition. It was 

 sent to me by Dr. Reed, and is said to have come from the Red Crag of Butley, the 

 locality from which I obtained my specimen. The volutions are somewhat angulated at 



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