Mr. S. V. Wood's Catalogue of Shells ffom the Crag. 529 



Spec. Char. Shell depressed, subtrapezoidal ; outer lip much 

 expanded ; inner replicate, lower part slightly projecting ; lines of 

 growth visible. Diameter one -eighth of an inch. PL V. f. 8, 9. 



Only two specimens (perhaps young ones), but they appear to dif- 

 fer from the young of the recent species (Marsenia producta, Leach, 

 Moll. p. 47 ; Bulla haliotoidea, Mont. T. B. p. 211. t. 7. f. 6.) in 

 their more expanded outer, and the projection at the lower part of 

 the inner lip, and more depressed form. 



Cor. Crag. Red Crag. Mam. Crag. Recent. 



1. Natica cateno'ides (Natica glaucinoides, Min. Con. t. 479. f. 4; not 



N. glaucinoides, Deshayes). 



Sutton. I Sutton. | Bramerton. | 

 It is necessary to change the name of this species, as the two 

 shells figured in ' Min. Con.' as glaucinoides are, I believe, distinct. 

 I have not yet seen a London clay shell that can be identified with 

 our crag species, of which a faithful representation is given at the 

 above reference. 



2. — catena (Nerita glaucina, Mont. Test. Brit. p. 469. Cochlea 



catena. Da Costa, p. 83. t. 5. f. 7). 



I Sutton. I I Britain. 



3. — ? multipunctata (Natica patula, Min. Con. t. 373). 



Ramsholt. | WaltonNaze. | | 



This differs from Nat. millepunctata in the greater size of the um- 

 bilical callosity, at all ages sufficient, I think, to constitute a specific 

 difference. There are the remains of spots in two of my specimens 

 from the red crag of Walton Naze similar to those upon the mille- 

 punctata, and as the name oi patula is preoccupied, I propose the one 

 above as expressive of its ornament and of its affinity. 



A thick calcareous operculum is in the cor. crag at Ramsholt, 

 which may possibly belong to this ; if so, it is not the millepunctata ^ 

 as it differs from the operculum of that species. Risso has justly 

 separated from Natica those species with a calcareous operculum, for 

 which he has proposed the name of Nacca ; this may probably be re- 

 ferred to it. 



4. — hemiclausa. Sow. {Min. Con. t. 479). 



I WaltonNaze. | | 



The umbilicus of this is closed in the adult shell. 



5. — cirriformis, Sow. (Min. Con. t. 479). 



Ramsholt. | | | 



6. — helico'ides, Johnston (Hist, of the Berwickshire Nat . Hist. Club, 



1834). 



I Sutton. I Bramerton. | Scottish coast. 



7. — clausa. Gray (Zool.of Beechey's Voy. t. 37. f. 6. and t. 34. f. 3. 



Nat. clausa. Smith, Werm. Mem. vol. viii. pi. \. f. 16). 



I Sutton. I I North Seas. 



8. — elevata, n. s. 



Ramsholt. | | | 



