RISSOA INCONSPICUA. 633 



Rissoa inconspicua (Akler). Plate Til, fig. 30. 



1844. Iii)^s(ia liiernixjiicKc, Aider, Ann. Mag. Nat. Hist. []J, vol. xiii, p. 82-3, [il. viii, figs. 0, 7. 

 1853. A'/.v'.s-'/rt iiiconspiciiii, Forbes and Hanley, Brit. Moll., vol. iii, p. 118, pi. l.xxxii, figs. 5 — 9. 

 1859. Rksoa incoiisjiicita, G. B. Sowerby, 111. lud. Brit. Shells, pi. xiii, fig. 22. 

 1867 — 84. Rissoa inronspicua, Jeffreys, Brit. Conch., vol. iv, p. 26, 1867; vol. v, p. 207, pi. l.wii, 



fig. 5, 1869; Proc. Zool. Soc. Loudon, p. 120, 1884 

 1872. Rissoa inconspicua, A. and R. Bell, Proc. Geol. Assoc, vol. ii, p. 204. 

 1874 — 7Q. Rissoa inconspicua, Seguenza, Ball. R. Com. Geol. Ital., vol. v, p. 4, no. 3(J2, 1874; 



vol. vii, p. 102, no. 661, 1876. 

 1878. Rissoa inconspicua, Reeve, Concli. Icon., vol. xx, pi. iv, fig. 34. 

 1878. Rissoa iiiconspicua and vars., G. O. Sars, Moll. Reg. Arct. Norv , pp. 182, 359, pi. x, fig. 11 ; 



pi. xxii, figs. 5, 6. 

 1884. Sahanea inconspicua, Monterosato, Nom. Gen. e Spec. Conch. Medit , p. 55. 

 1890. Rissoa {Turhella) inconspicua, Carus, Prod. Faun. Medit., vol. ii, p. 324. 

 1892. Rissoa inconspicua, Locard, Coq. mar. Cotes de France, p. 173. 

 1892 — 98. Rissoa inconspicua, A. Bell, Rep. Yorks. Phil. Soc, p. 63, 1892; Trans. Roy. Geol. Soc. 



Cornwall, vol. xii, p. 152, 1898. 

 1898. Rissoa inconsjncua, Bucquoy, Dautzenberg et Dollfus, Moll. mar. Ronss., vol. ii, p. 797. 

 1901. Rissoa inconsjncua, Br.dgger, Norges geol. Under.';,dgelsc, No. 31, pp. 513, 660, pi. xvii, fig. 11. 

 1901. Rissoa inconspicua, Couch. Soc. List, Journ. of Conch., vol. x, p. 18, no. 333. 

 1910. Rissoa inconspicua, 0yeu, Kongl. Norske Vid. Selsk. Skrift., No. 9, pp. 34 et seq. 



1912. Rissoa (Turbella) inconspicua, Cerulli-Irelli, Palaeout. Ital., vol. xx, p. 192, pi. xv, 

 figs. 35—42. 



1913. Rissoa^ (Turbella) incons2)icua, Dautzenberg et Durouclioux, Feuille des Jeunes Natur., 

 vol. xliv, p. 29, pi. ii, fig. 5. 



Specific GJtaracfers. — Shell iiiinute, conical, rather solid ; whorls (3—7, convex 

 but not tumid ; ornamented by curved fine and inconspicuous longitudinal ribs 

 which do not extend to the base, and by delicate spiral lines, stronger where they 

 define the termination of the ribs ; spire short ; suture w^ell marked but not deep ; 

 mouth oval ; outer lip contracted above ; inner lip thickened, expanded and 

 reflected below with a small umbilicus. 



Dimensions. — L. 2 mm. B. 1 mm. 



Distribution. — Recent: British seas, coralline zone {passim). Lofoten islands, 

 Finmark, Cattegat, Sweden, Norwegian coast, French coast to Canaries and 

 Madeira, Mediterranean, .^Egean, Tangier. 



Fos.nl : St. Ertli, Coralline Crag (Bell), Selsey, Irish estuarine 

 clays, Jordan Hill, Largo Bay. 



Pliocene : Monte Mario, Farnesina, Altavilla. 



Pleistocene : Ficarazzi, Monte Pellegrino, Reggio, Taranto, Livorno, Christiania 

 fiord — Isocardia- and Tr7^x'6'-banks (Br^gger), Trondhjem (0yen). 



Bemarl's. — This njinute British shell, which ranges also from Finmark and the 

 Lofoten Islands in one direction to the Mediterranean and the Canaries in another, 

 has been reported by Mr. Bell from St. Erth, Selsey, and the Coralline Crag. 



