MELVILL : NEW MARINE SHELLS FROM BOMBAY. 115 



all showing' the mammillate hetcrostrophe apex so distinguishing 

 a trait of this family. In form resembling T. acuticostata, Jeffreys. 

 The trivial name now imposed suggests such affinity. 



22. TURBONILLA TEREBRINA, n.Sp. PI. VIII, Pig. 20. 



T. testa graeillima, multum attenuata, Candida, nitida, peiia3vi, 

 anfractibus 11, longitudinaliter lasvissimi-costatis, interstitiis omnino 

 Isevibus, apcrtura oblonga, peristomate simplice. Long. 6, lat. M5 mm. 



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

 shell, with smoothly rounded ribs, scarcely elevated, and the inter- 

 stices also quite smooth ; mouth oblong, lip simple. Five specimens. 

 The superficial likeness to a species of Terehra suggested the trivial 

 name. It belongs to the typical genus Turbonilla proper, and is nearly 

 allied to some European species. 



23. Turbonilla (Ptrgostelis) Emilia, n.sp. PI. VIII, Fig. 25. 



T. testa minuta, oblonga, cylindiica, Candida, apice mamillai'i 

 heterostropho, anfractibus 6, undique longitudinaliter recticostatis, 

 interstitiis transversim arete tenuissimi striatis, apertura ovata, 

 peristomate, paullum inerassato, margine columellari simplice. 

 Long. 1-75, lat. 75 mm. 



A very small, straightly-'whorled, white, semipcllucid species, of 

 which many specimens occurred in the last consignments of shell- 

 shingle, but -which was not noticed in previous siftings. I am not 

 quite satisfied with the location, though it seems to resemble in form 

 such species as Pi/rgostelis flexuosa, Jeffreys. Had a columellar plait 

 been present, no doubt it would be relegated to Pi/rgulina. I venture to 

 associate with this little shell the christian name of Mrs. Abercrombie. 



24. CiNGULiNA Archijiedea, n.sp. PI. VIII, Fig. 2. 



C. testa pyramidato-fusiformi, Candida, concinna, solidiuscula, 

 anfi'actibus 11, transversim spiraliter acute bicarinatis, interstitiis 

 oblique rudi-lineatis, ultimo anfractu apud basim lajvi, ad peripheriam 

 angulato, apertura subquadi-ata, 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 Cingulinte 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 terehra, L. 



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



P. testa miuutissima, perforata, solidiuscula, alba, nitida, an- 

 fractibus 5, tumescentibus, ventricosis, loevissimis, rubro-punctatis et 

 flammulatis, apud medium anfractus ultimi squarrose rubro-maculatis. 



