148 MOLLUSCA FROM THE CRAG. 



12. Natica MULTiPUNCTATA. S. Wood. Tab. XVI, fig. 9, a— ^/. 

 Natica patula. J. Sow. Min. Conch, t. 373. 



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



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



— MULTIPUNCTATA. S. Wood. Catalogue 1842. 



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



N. Testa ellipticd, obliqud, depressd, crassd, lavigatd, multipunctatd ; spird produc- 

 tiusculd ; anfractibus quahior, stiperne subdepressis, inferne expansis ; labio caUoso, crasso ; 

 vmbilico spiraliter jur/oso ; operndo ad margine unistdcato. 



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. 



Long est diameter, \\ inch. 



Localitij. 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- 



ptmctata in the greater size and pecuhar flatness of the callosity at the upper part of 



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



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, mth 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. millcpiivcfata 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 maybe 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 



