OF NEW SOUTH WALES. 263 



two Australian Turritellas with a sinus in the outer lip (T. 

 sinuata, &c), but the sinus is broad and shallow, while in this 

 case it is a narrow deep cut of equal width extending some 4 

 or 6 millim. into the shell. 



ClNGULINA TORCULARIS. 



This singular species is distinguished by its very prominent 

 spiral keel on the centre of each whorl, which makes the shell 

 appear like a small screw. The nucleus is smooth, white, and 

 shining, not reversed but subvertical ; the base has three rounded 

 keels, and the aperture is somewhat produced. It is larger than 

 Cingulina australis nobis, has only one keel, while that shell has 

 two. 



T. parva, subdiaphana, sordide alba, subnitente, pyramidata; anf. 

 (nucleo excluso)4i } in medio valde unicarinatis, carina acuta elevata, 

 sutura pro/wide impressa, nucleo Icevi, nitenie, subverticaliter sito ; 

 basi conspicue tricarinata, periplieria altimi anfr. acuta, apertura 

 circulari integra, extus conspicue quadricostata, labio tenui, leviter 

 reflexo, labro antice producto. Long. 3^, lat. 1^ mil. 



Natica subcostata. 



T. parva, oblique elliptica, nitente, polita, alba auguste umbilicata, 

 anf. 3, rapide decrescentibus, ultimo Icevi, striis tantum incrementi 

 sparsim munito ; penultimo costis parvis regularibus radiatim ornato ; 

 apertura semilunari, magna, labro acuto, labio recto ; umbilico callo 

 parvo, spiraliter costiformi insignito. Major diam. 5, min. 3| mil. 



A small, smooth-shining Natica of oblique elliptical form, 

 mainly distinguished by small, fine radiating ribs on the 

 penultimate whorl. 



The next shell which I have to describe is of so rare and re- 

 markable a genus that a few words concerning its generic history 

 may not be unnecessary. The genus Raulinia to which it 

 belongs was erected by Mons. C. Mayer (Jour, de Conch. 1864, 

 p. 180) for small turbinated, oblong, oval, thin shells, with spiral 

 grooves. Whorls rapidly increasing, convex ; the last very 

 large. Aperture large, slightly oblique, oval oblong, entire, 



