Melanopsis. 



MOLLUSCA. 



95 



3. Melanopsis Deptfordensis. — The Deptford Mela- S. Melanopsis ? attenuata. — The Attenuated Melanop- 

 nopsis, pi. XLV. fig. 22, 23. sis, pi. XXXIII.* fig. 27. 



Melanopsis fusiformis. Sowerby, IV. p. 36, pi. 332, fig. 5. Melanopsis attenuata. Sowerby, Geo. Trans. IV. 2nd series. 



Shell smooth, oblong-ovate, fusiform, acuminated both above P- 346, pi. 22, fig. 5. 

 and below ; body considerably ventricose in the middle ; spire Subulate, attenuated; with seven or eight somewhat inflated, 



short, with three flat-sided volutions, and acutely pointed; aper- deeply divided volutions, with several carina) on each, the upper 

 turc elongated, sharp and contracted above, and also narrowed o'"' 'l'^ strongest; crossed by undulating, irregular stria>, or 

 below ; outer lip slightly undulated ; inner lip broadly reflected 1'"^* "f growth ; aperture subovato, short, and not occupying 

 on the columella above, and gradually becoming narrower as it more than a fourth of the length of the shell, 

 descends. Found in the Blue Clay of Punfield, Dorsetshire, and in the 



This differs from the preceding, in being much shorter in proportion Hastings Sand at HoUington and Pounceford, Sussex, 

 to its breadth, in being more ventricose, and tapering more abruptly to 

 both extremities. 



Found in the Marine formation. Isle of Wight. 



4. Melanopsis fusiformis. — The Spindle-shaped l\Iela- 

 nopsis, pi. XLV. fig. 20, 21. 



Melanopsis fiuiifoiinis. Sowerby, IV. p. 35, pi. 332, fig. 2, 

 3, 6, and 7. Fleming, p. 359. 



Smooth, subcylindrical, fusiform, acuminated at both extre- 

 mities ; spire with four flat-siiled volutions, defined by a very 

 narrow sutural line, and ending in an obtuse apex ; aperture 

 oblong, half the length of the shell, contracted both above and 

 below ; inner lip very glossy, broadly spread over the columella 

 above, becoming narrower as it descends, and ending in a mere 

 point at the base. 



Found at Hordwell and New Charlton, in the Upper Marino 

 formation. 



5. Melanopsis subulatus The Awl-shaped Melanopsis, 



pi. XLV. fig. 16, 17. 



Melanopsis subulatus. Sowerby, 1\'. p. 36, pi. 332, fig. S. 

 Fleming, p. 35i). 



Genus L — INIELANIA Lamarck. 



Shell turreted, or subturreted ; spire for the most part 

 elono^ated, with the volutions divided bv a doop suture, 

 and generally terminating in an acute apox ; aperture 

 entire, oval or oblong, in most species acuminated at the 

 superior extremi^-, and rounded below : with an indis- 

 tinct canal at the base of the columella; outer lip simple, 

 and somewhat sharp ; columella smooth, incurved ; out- 

 side covered with a strong, horny, olivacious, brown, or 

 black epidermis ; operculum horny, oblong, spiral, with 

 two or three volutions. 



I. Melania scalarioidea. — The Scalariform Melania, pi. 

 XLV. fig. 46. 



Melania scalarioidea. Phillips, II. p. 22*), pi. 16, fig. 3. 

 Somewhat scalariform, elongated ; volutions broad, rather 



Melania sulculosa. Phillips, II. p. 22S, pi. 16, tig. 1 a. 

 Elongated ; with conve.\, deeply divided volutions, which arc 

 thioklv invested with longitudinal, arcuated sulci, which deepen 



Smooth, subulate, and conical ; spire rather elongated, with convex on the sides, with longitudinal, equal, thread-like striic. 



six or seven nearly flat-siiied volutions; aperture ovate, short, Found in the Mountain Limestone, Holland, 



being only one-third the length of the shell. 2. Melania sulculosa. — The Sulcated Melania, pi. XLV. 



Found in the Upper Marine formation. Isle of Wight. fii,'. 26. 



6. Melanopsis Sedgvickii Sedgwick's Melanopsis, pi. 



XLV. fig. 6. 



Melanopsis fusiformis. Sowerby, IV. pi. 332, fig. 1. 



Smooth, oblong, fusiform, tapering to both extremities; body towards the lower portion of the volutions. 



very large ; spire very short, consisting of three flat-sided volu- Mountain Limestone, Kildare and BoUand. 



tions; aperture oblong, occupying nearly half the length of the 3. Melania truncata.— The Truncated Melani.i, pi. 



shell; outer lip slightly inflected; pillar lip a little spread over •^»-'' • ''S- -"' '-^• 



the columella. " Melania ti-uttcata. Sowerby, III. p. 72, pi. 211, fig. 4. 



This sliell ililTiM-s from 3f. D<'i>ltordeiisis, in boini,' less fusiform, uiul rlemiug, p. 31 /. 



in the uppor luutioii of the lioily heini,' more inllalod. Smooth, polished, elongated, conical ; body short; spiro long, 



Found ill the Upper Marine formation. Isle of Wight. consisting of eight or nine flat-sided volutions, which are some- 



7. Melanopsis? tricarinata The Three-keeled Mela- what angular below; aperture ovate, contracted above, and 



nopsis, pi. XXXIII.* fii'. "Jt). truncated below; outer lip somewhat thickened. Not a line in 



Melanopsis tricarinata. Sowerby, Geo. Trans. IV. 2nd length, 



series, p. 346, pi. 22, fig. 4. Melania tricarinata, Ann. Phil. Loudon Clay, Brakeuhurst. 



VIII. N. series, p. 376. 4. Melania minima. — The Least Melania, pi. XL\'. tig. 



Turreted, subulate, conical ; spire consisting of six carinated, 29, 31). 



deeply divided volutions; three carina' occupy the exposed Melania minima. Sowerby, IIL p. 72, pi. 241, lij 



portion of the volutions, the central one considerably more ming, p. 317- 



elevated than the others; these are crossed by strong, distinct Smooth, subulate; body short; spire long, with eight or nine 

 lines of growth ; aperture suborbicular, slightly contracted both flat-sided volutions, the apicial one acute ; aperture ovate, con- 

 above and below. traded above, and rounded below. Length ecpial to four times 



Founil in the Blue Ciav of Puiilield, Oorselshire, ami in the its diameter; very minute, not a hue in length. 



Hastings Sand at I'ounceford, near Burl'ord, Sussex. London Clay, Brakeuhurst. 



Fie- 



