466 GASTROPODA. [Pectinibranctiia. 



13. Marginella turbinata, Sowerby, 1846. Plate 20, fig. 20. 



Man/inella turbinata, Sow., Thes. Conch., i, 1846, 385, pi. 75, f. 70, 71 ; 



Conch. Icon., xv, pi. 22, f. 122 ; Kuster, Conch. Cab., 1879, 86, pi. 16, 



f. 9 ; Man. Conch. (1), v, 23, pi. 7, f. 4 ; Chall. Rep., xv, 265 ; Harris, 



C. Tert. M.B.M., i, 87 ; Pritchard and Gatliff, P.R.S. Vic., xi (n.s.), 191 ; 



Tate and May, P.L.S. N.S.W., 1901, 362 ; Index, 74. 



Shell small, volutiform, solid and polished, slightly plicate on the 

 shoulder of the body-whorl, with a short spire. Sculpture consisting 

 of regularly spaced ronnded riblets on the shoulder of the body-whorl, 

 not extending over the base, sometimes obsolete. Colour faintly 

 yellowish-white, the lips pure-white. Spire short, conoidal. Proto- 

 concli broadly rounded. Whorls 3| to 4. the last large, subangulate 

 on the shoulder, much narrowed below. Suture very indistinct. Aper- 

 ture nearly as high as the shell, narrow, but slightly widening below, 

 lightly channelled above, the outer lip very little incised, broadly trun- 

 'cated and but little emarginate below. Outer Up much thickened, 

 smooth and reflected inside, the varix extending over the basal margin 

 to the inner lip, above close to the apex. Columella oblique, straight, 

 with 4 distinct plaits, the three lower ones oblique and close together, 

 the remaining one transverse. Inner lip spreading over the faintly 

 convex parietal wall and broadly over the body. 



Diameter. 5 mm. ; height, 9 mm. 



Animal unknown. 



Type in the British Museum. 



Hab. Cape Maria van Diemen (Miss Robison) ; Spirits Bay (C. 

 Cooper) : in deep water. Also Tasmania and Australia. The type 

 is from Port Jackson. 



Genus 2. CRYPTOSPIRA, Hinds, 1844. 



Cryptospira, Hinds, Voy. "Sulphur," 1844, ii, 46. Type: Marginettn 

 qitinqueplicatd, Lam. 



Shell oval, sometimes ventricose above ; spire hardly raised ; 

 basal limb callous and well limited ; aperture narrow, with a basal 

 sinus ; outer lip more or less thickened, smooth or plicated inside ; 

 columella with 5 plaits, and very often a few additional ridges on the 

 parietal wall. 



Subgen. 1. GIBBERULA, Swainson, 1840. 



Gibberula, Swains., " Malacology," 1840, 323. Type : Valuta miliaria, L. 

 Microspira, Conrad, 1862. Granula, Jousseaume, 1875. 



Shell small and vitreous, thin ; spire hardly prominent, the last 

 whorl forming nearly the whole of the shell ; basal limb large and 

 callous, limited by an obtuse ridge ; aperture very narrow above, 

 deeply notched at the base ; outer lip not very thick, retrocurrent 

 towards the suture, without an outer varix, smooth or crenate inside ; 

 columella with 2, 3, or 4 plaits below, and a number of parietal ridges 

 in addition ; inner lip distinct and extending the whole length of the 

 aperture. 



