GASTEROPODA. 113 



Shell thin, globosely conical, subtrochiform, or rather turbinated ; spire slightly 

 elevated ; whorls 4—5, convex, rounded ; suture deep ; aperture circular ; peritreme 

 sharp, continuous ; umbilicus moderate, deep. 



Elevation, \ of an inch ; diameter of base, the same. 



Locality. Mam. Crag, Bramerton. Recent, Britain. 



This shell I beheve to be rare ; two specimens of it were given to me by Mr. Lyell, 

 and a few others sent for description by Mr. Wigham are all that I have seen. This 

 species has also been found plentifully in the Fluviatile deposits of Grays, Clacton, and 

 Stutton ; and from the former locality a shell was described by Mr. Morris and 

 Mr. Sowerby, under the name of antiqiia, which was larger, more elevated, and with 

 less convex or rounded volutions ; and it was considered by those gentlemen a dis- 

 tinct species. Specimens have been since found possessing an intermediate character, 

 some of which are in my own cabinet ; and it is now generally considered by most 

 conchologists only as a variety. 



Vermetus,* Adansoti, 1757. 

 Serpulokbis. Sassi. 



Gen. Char. Shell elongate cylindrical, tubular, spiral in its young state, afterwards 

 twisted without regularity ; aperture small and circular, adherent generally by the 

 apex or upper volutions ; operculum corneous, circular, and raultispiral. 



This approaches so near to the testaceous Annelides, that it cannot be distinguished 

 by the shell alone. By the examination of the animal, malacologists have, however, 

 determined it to be a true Mollusc, approaching, in many of its characters, to the 

 genus Turbo. 



1. Vermetus intortus. Lam. Tab. XII, fig. 8, a—b. 

 Serpula intokta. Lam. 

 Vermetus intortcs. Brown. Lethea Geogn. p. 990, Taf. 36, fig. 18, a, b, e, 1837. 



— S. Wood. Catalogue 1842. 



— Phil. En. Mol. Sic. vol. ii, p. 144, 1844. 

 Bale. Hist, and Antiquities of Harwich, t. 13, fig. 1, 1730. 



V. Testa jilerumque gregarid, tereti, siihquadratd , arde spiratd, fere tola affixd, 

 repente ; sfriis transvcrsis vndulato-rugosis ; lineis tribus longitudinaliter instritctis, extre- 

 mitate anticd aliquando libera, porrectd. 



Shell generally gregarious, tubular, subquadrate, laterally affixed for a considerable 

 length, closely and regularly spiral in the young state, transversely nigose, with three 



* Etym. Vermis, &Y!OTm. 



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