- DESCRIPTION'S OF NE W SPECIES OF MA RINE SHELLS, 513 



22. Turbonilla terebrina, n. sp, Pl.«Fig„20. 



T. testa gracillima, multum atteuuata, Candida, nitida, perlsevi, anfractibus 

 11, longitudinaliter leevissimi-costatis, interstitiis omnino kevibus, apertura 

 oblonga, peristomate simp lice. Long. 6, lat. 1*15 mm. 



About the same size as the preceding, but a more solid, shining shell 

 wjth smoothly rounded ribs, scarcely elevated, and the interstices also 

 quite smooth ; mouth oblong, lip simple. Five specimens. The superficial 

 likeness to a species of Terebra suggested the trivial name. It belongs 

 to the typical genus Turbonilla proper, and is nearly allied to some 

 European species. 



23. Turbonilla (Pyrgostelis) emille, n. sp. PI. Fig. 25. 



T. testa minuta, oblonga, cylindrica, Candida, apice mamillari heteros- 

 tropho, anfractibus 6, undique longitudinaliter recticostatis, interstitiis trans- 

 versim arete tenuissimi striatis, apertura ovata, peristomate, paullum incrassato, 

 margine columelkri simplice. Long. 1*75, lat. 75 mm. 



A very small, straightly-whorled, white, semipellucid species, of which 

 many specimens occurred in the last consignments of shell shingle, but which 

 was not noticed in previous sittings. I am not quite satisfied with the loca- 

 tion, though it seems to resemble in form such species as Pyrgostelis flexuosa> 

 Jeffreys, Had a columellar plaint been present, no doubt it would be rele- 

 gated to Pyrgulina, I venture to associate with this little shell the christian 

 name of Mr, Abercrombie, 



24. Oingulina archimedea, n. sp. PI. Fig. 2. 



C. testa pyramidato-f usiformi, Candida, concinna, solidiuscula, anfractibus 

 11, transversim spiraliter acute bicarinatis interstitiis oblique rudi-lineatis 

 ultimo anfractu apud basim lsevi, ad peripheriam angulato. apertura sub- 

 quadrata, labro simplice. Long. 5, lat. 1*75 mm. 



Three specimens all precisely similar, of a pure white shell, with a slight 

 bluish tinge in parts, spirally acutely twice keeled on the whorls, which would 

 be in a perfect specimen eleven in number, but none of those before us have 

 the apex complete ; the keels are sharp and projecting. At the base the shell 

 is smooth, the aperture is squarely angular, mouth simple. This species is 

 the most sharply carinate of any Cingulince we have examined. The 

 miniature screw-like appearance suggested the trivial name, after Archimedes, 

 the celebrated Syracusan mathematician, inventor of the screw, who is reported 

 to have taken for his model thereof the well-known Mediterranean shell 

 Turritella terebra, L. 



25. Phasianella minima, n. sp. PI. Fig. 11. 



P. testa minutissima, perforata, solidiuscula, alba, nitida, anfractibus 5, 

 tumescentibus, ventricosis lsevissimis, rubro-punctatis et Eammulatis, apud 

 medium anfractus ultimi squarrose rubro-maculatis, maculis transversis, 

 pauciS) apud basim multipunctatis, apertura ovatorotunda, labro simplice, 

 Long. 2 mm. sp. maj., lat. 1 mm. 



