!48 MOLLUSCA FROM THE CRAG. 



12. NATICA MULTIPUNCTATA. S. Wood. Tab. XVI, fig. 9, af. 



NATICA PATULA. J. Sow. Min. Conch, t. 373. 



Nyst. Rech. Coq. foss. d'Anvers, 1835, p. 25, No. 12. 



Morris. Cat. of Brit. Fossils, p. 153, 1843. 



MULTIPUNCTATA. S. Wood. Catalogue 1842. 



CKASSA (?). Nyst. Coq. foss. de Belg. p. 443, pi. 37, fig. 33, 1844. 



N. Testa ellipticd, obliqud, depressd, crassd, Itevigatd, multipundatd ; spird produc- 

 tiusculd ; anfractibus quatuor, supernesubdepressis, wferne expansis ; labio calloso, crasso ; 

 umbilico spiraliter jugoso ; operculo admargine unisulcato. 



Shell ovate, depressed, oblique, with an elliptical outline ; thick, and smooth, 

 covered with numerous spots ; spire slightly produced ; upper part of volution a little 

 depressed, mouth much expanded below ; left lip callous, with a small spiral ridge in 

 the umbilicus. Operculum with a deep spiral sulcus near the outer edge. 



Longest diameter, 1 1 inch. 



Locality. Cor. Crag. Ramsholt and Gedgrave. 

 Red Crag, Walton Naze. 



A most abundant shell at Walton Naze. It differs (as I have before pointed 

 out in my Catalogue in the An. and Mag. Nat. Hist. 1842, p. 529,) from N. mille- 

 punctata in the greater size and peculiar flatness of the callosity at the upper part of 

 the umbilicus, while the spiral ridge is much smaller, varying not only in the different 

 distribution of this calcareous deposition at its large and open umbilicus, but also in 

 the greater quantity of it : the volutions are also more depressed, the shell more 

 regularly ovate, and the mouth larger, with a less elevated and distinct spire. The 

 differences here pointed out appear to me sufficient to constitute a specific character, 

 and I have, in consequence, retained my own name, which was published in 1842, in 

 preference to that by M. Nyst, which was published in 1844. The Italian and 

 Bordeaux fossils in my possession differ also from the Crag shell. The smaller figure, 

 9, c, represents a specimen from the cabinet of Miss Alexander, of Goldrood, near 

 Ipswich, who has obligingly permitted me to have it figured. It contains its 

 operculum in position, and was found at Walton-on-the-Naze. This appendage differs 

 from that of N. millepunctata in having a ridge with a broad and deep sulcus near the 

 edge ; and it is rather singular that this is the only instance, to my knowledge, of 

 this thick and strong operculum having been found, although the shell may be procured 

 by hundreds. Fig. 9, d e, is from the Coralline Crag, and is probably only a variety 

 of this species. It had been considered distinct, and possessed in my cabinet the 

 name of consors, but the discovery of an operculum from that formation, corresponding 

 with that found in situ from the Red Crag, has given reason to suppose them the same 

 species. The greatest difference is in its having a rather more distinct and elevated 

 spire, with a sharper apex, and a rather less depressed or elongated aperture. The 



