RISSOA PARVA. 631 



1878. Rissoa parva, Mouterosato, Eiiuin. e Sinou. Couch. Medit. (Giorii. Soc. Sci. Nat. Palermo, vol. 

 xiii), p. 8:3. 



1878. JiisMiK juirro, Reeve, Couch. Icon., vol. x.\, pi. iv, i'vj;. 3(). 



1879. Riiisoa jxirtm !, S. V. Wood, Mou. Crag Moll., 2iid Suppl., p. 29, pi. iv, fig. 21. 



1884. Jiissoa {Turhella) parva, Biicquoy, Dautzeiiberg et Dollfus, Moll. mar. Kouss., vol. i, p. 272, 



pi. xxxii, figs. 11, 12. 

 1890. Rissoa (Tiirhfilla) parra. Cams, Prod. Faun. Medit., vol. ii, p. 82-i. 

 1892. Rissoia parva, Locard, Co(|. mar. Cotes de France, p. 173, fig. 148. 

 1895. Missoia {TurheUa) parva, Sacco, Moll. Terr. Terz. Piem., pt. xviii, p. 22. 



1901. Rissoa parva, Brpgger, Norges geol. Unders,dgeke, No. 31, pp. 380, 513, 6()0, pi. xviii, fig. 11. 

 1901. Rissoa jyarva. Couch. Soc. List, Journ. of Conch., vol x, p. 17, uo. 332. 



1913. Rissoa {Turbella) parva, Dautzenberg et Durouchoux, Feuille des Jeuues Natur., vol. xliv, 

 p. 29, pi. ii, fig. 3. 



1914. Rissoia {TurheUa) parva, CeruUi-Irelli, Palaeout. Ital., vol. xx, p. 191, pi. xv, figs. 32—34. 



Specific Characters. — Shell small, oval, rather solid ; whorls 6 — 7, decidedly 

 convex, the last nearly two-thirds the total length, tlie lower ones ornamented hy 

 strong cnrved ribs which hardly reach the base, their termination defined more or 

 less distinctly by spiral strise, the upper whorls Avithont sculpture; spire short, 

 regularly diminishing to a slightly compressed apex ; suture distinct ; mouth 

 oval, expanded below ; outer lip incurved and contracted above ; inner lip reflected, 

 without umbilicus. 



Blmeimojis. — L. 4 mm. B. 2 mm, 



Distribiifion. — Recent : British seas, widely distributed. Norwegian coast, 

 Sweden, Denmark, Holland. Atlantic coasts of France, Spain and Portugal to the 

 Canaries. Mediterranean, Adriatic, ^gean. 



Fossil: St. Erth. Coralline Crag;': Sutton. 



Pleistocene: Bridlington, Kelsey Hill, Portland, Selsey, Largo Bay, Irish 

 estuarine clays and Scottish drift (passim). Holocene : Portrush. 



Pliocene : Biot, Monte Mario, Altavilla. 



Pleistocene : Reggio, Christiania fiord — Ostrea-, Isocardia- and Tapes-hanks. 



llemarhs. — This species, which is a common and widely spread British form, 

 ranging both to the north and south of our shores, has been doubtfully reported 

 from the Coralline Crag of Sutton ; there is an imperfect specimen, however, from 

 St. Erth in the British Museum which was obtained some years ago by Mr. Bell. 

 He informs me it is very common in many of our Pleistocene deposits. The 

 perfect example liei-e figured is from the estuarine clays of Belfast. 



It has been reported from a few localities in the Pliocene and Pleistocene of 

 Italy and Sicily and from the post-glacial beds of the Christiania fiord. 



Var. interrupta (A. Adams). Plate LI, fig. 13. 



1799. Turbo interrupt us, A. Adams, Traus. Liuu. Soc, vol. v, p. 3, pi. i, figs. 16, 17. 

 1803. Turbo interrujitus, Moutagu, Test. Brit., p. 329, pi. xx, fig. 8. 



