MOLLUSCA. 47 



This is the largest species hitherto described, but is not otherwise very pro- 

 minently distinguished. It possesses the peculiar livid colour common to most of 

 the species, varying to white near the sutures and at the back of the lip ; the latter 

 is of a horny-green colour. 



Ringicula. Deshayes. 



191. Ringicula caron, Hinds, Proceed. Zool. Soc. 1844, (Plate XVI, fig. 15, 16.) Testa, 

 ovata, acuminata, striata, nitida ; anfractibus rotundatis, ultimo subtransverso, rotundato, distanter 

 striato ; spira exserta. ; apertura subabbreviata ; labro corrugato. 



Inhab. Straits of Malacca ; in seventeen fathoms, among mud. 



The species of Ringicula are not readily identified by description, but the 

 above may be distinguished from a few others which I have described in the Pro- 

 ceedings of the Zoological Society, by its proportionately lengthened spire, the 

 shortening of the last whorl, whereby its greatest breadth is probably in the 

 transverse direction, and by being grooved with striae situated at regular distances 

 from each other. 



Ovulum. Lamarck. 



192. Ovulum dorsuosum, (Plate XVI, fig. 3, 4.) Testa elongato-ovata, lgevissime striata, 

 utrinque subacuminata ; dorso supra mediam rotundato, interne attenuato ; labro antice planulato, 

 sulcato ; columella interne subexcavati, intus plica longitudinali munita.. 



Inhab. Straits of Malacca ; in nine fathoms, among mud. 



193. Ovulum gallinaceum, (Plate XVI, fig. 1, 2.) Testa solida, retusa, ovata, albida, nitida, 

 dorso superne angulata fascia transversa picta, inferne angustata; spiral minutissime granulata ; 

 labro sulcato ; columella ad dimidium inferiorem sulcata ; apertura angusta, lineari. 



Inhab. New Guinea ; Straits of Macassar ; in from five to seventeen 

 fathoms. 



A small species adorned on the angle at its back with a single transverse 

 brown band. The aperture is very contracted, and the outer lip, together with 

 the inferior half of the columella, is delicately sulcated. Minute granulations 

 cover the spire, but they are scarcely visible to the naked eye. 



194. Ovulum corrugatum, (Plate XVI, fig. 5, 6.) Testa parva, pallide virente, dorso cor- 

 rugata, linea. mediana conspicua ; apertura angusta, ad basin fusco picta. 



Inhab. New Guinea; in from five to twenty-one fathoms, among soft mud. 



