64 PROCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



Hill, Hig;ligate Archway and Potter's Bar. Oldhavcn Beds (?) : Chislet. 

 Thanet Sands : Pegwell Bay. 



Dentalium coNSTRiCTirM:, n.sp. 



Shell slightly curved posteriorly, almost straight in its anterior 

 portion ; section circular ; surface ornamented with closely set con- 

 centric stria;, constricted at irregular intervals, producing a rugose 

 appearance ; longitudinal stria; when present very 

 ohsolete ; fissure absent. Length 10 ; diam. 2 mm. 



This species bears a close resemblance to Entaliopsis 

 anmdata so far as the concentric ornamentation is 

 concerned ; that character, however, is much less 

 pronounced, being in fact almost obsolete in some 

 specimens. The irregularly disposed constrictions, with 

 the absence of a fissure, are sufiiciently distinctive. 

 It differs from D. nitens, which is a smooth species 

 deficient in constrictions. The specimen figured, which 

 is in the Katural History Museum, is of average dimen- 

 sions, but some others not so well preserved reach 

 a length of 21 mm. It appears to be common and 

 confined to the Hampshire basin. 



Formation. — London Clay. Localities. — Fareham 

 (type) and Portsmouth. 

 Denialium 

 constrictum, n.sp. 



Genus FUSTIARIA, Stoliczka. 



Cretaceous Gastropoda, Mem. Geol. Surv. India, 1868, p. 439. 



Type. — Dentalium ehurneum, Linnaeus, Systema Naturae, 1767, 

 ed. 12, vol. i, part 2, p. 12G4. 



" Shell tubular, thin, usually slightly curved, smooth, posterior end 

 with a long linear slit, on or near the ventral side." — Stoliczka. 



Ffstiaria fissura, Lamarck. 



Dentalium fissur a, Lamk. — Hist. !N"at. Anim. sans Yert. 1818, 

 vol. V. p. 346. Desh. — Mem. Soc, Hist. Nat. Paris, 1826, vol. ii. 

 part 2, p. 368, pi. xviii. figs. 6, 7. 



Lentalimn nitens, J. de C. Sby. — Dixon's " Sussex," 1850, p. 95, 

 pi. vii. fig. 3 [non J. Sowerby, 1814). 



Dentalium fissura, Desh. — -Desc. Anim. sans Yert. 1861, vol. ii. 

 p. 213, pi. i, figs. 24, 25, 26. 



Dentalium {Fustiaria) fissura, Cossm. — Ann. Soc. U. Mai. Belgique, 

 1888, vol. xxiii. p. 10. 



Fustiaria fissura, R. B. Newton. — Svst. List Edwards Coll. British 

 Museum, 1891, p. 285 



Distinguished from F. lucida by being more arch-shaped, and by 

 having the posterior fissure much shorter ; the anterior portion is 

 relatively of larger diameter. It is rather common. 



Formation — Bracklesham Beds. Localities. — Bracklesham Bay, 

 Bramshaw and Brook. 



