218 Notice of a new Fossil Shell 



Cyclostoma lucidum of Lowe *, which is found "in Madera? 

 humidissylvaticis ; " a locality not at all incongruous with the 

 notion that it may belong to the same family. In several of 

 its characters, this last-named shell very nearly resembles the 

 Nematurae, though, in the absence of all knowledge of the 

 animals of either, I dare not venture any assertion of their 

 congeneric relation. The propriety of placing this shell with 

 the Cyclostomata appears to me rather doubtful. 



Spec. 1. Nematura Deltas 13enso?i. — This is the largest of 

 the three species ; and, when complete, measures from one 

 eighth to one sixth of an inch in length : it is rather more 

 compressed than the others ; its colour is yellow, and its 

 surface dull, not polished: from the Delta of the Ganges. 

 (Jg. 22. a.) 



Spec. 2. Nematura minima Miln. — This is about one 

 fifteenth of an inch in length, and is translucent: it has a 

 smooth polished surface, and a small umbilicus, and it is of a 

 light brown colour. Many specimens were found in a chip 

 box, among minute shells, in the collection of the late George 

 Humphrey, marked by him " from the W. I." (Jig. 22. b.) 



Spec. 3. Nematura fossilis Mihi. — This is of the same 

 length, but more ventricose than N. minima : it has a smooth, 

 but not polished, surface ; and it is opaque and white. Found 

 in shell sand from Grignon and Orglandes. (Jig. 22. c.) 



Art. XII. Notice of a new Fossil Shell Jrom the Coast of Suffolk. 

 By Edward Charlesworth, F.G.S. 



The annexed figures (Jig.23.) represent a very singular fossil 

 shell found on the beach at Felixstow, possessing characters 

 which render it difficult to determine to what genus it is most 

 nearly allied. Its general form is that of a Fiisus or Fasciolaria, 

 with a short subreflex canal ; but it wants the plaits which 

 are characteristic of the latter genus ; and is also distinguished 

 from it and the former, by a remarkable callosity upon the 

 columella, extending from about the widest part of the aper- 

 ture, along the margin of the inner lip, towards its upper or 

 posterior part, where it terminates abruptly in a prominent 

 obtuse tooth, forming a deep notch with the outer lip, when 

 the shell is entire. 



In many species of Nassa, and in Mr. Gray's genus Pollia, 

 a tooth, or plait, occurs at the posterior part of the columella ; 

 but in these instances it extends internally in a direction at 



* Transactions of the Cambridge Philosophical Society, vol. iv. p. 66. 

 pi. 6. f. 40. 



