Pleurotomaria. 



MOLLUSCA. 



87 



umbilicated, with its edges spirally striated; aperture lunate; 

 surface covered with faint lines of growth, which are retrollexed 

 in the middle. 



Found in the Mountain Limestone, Holland. 



17. P. viTTATA — The Banded Pleurotomaria, pi. XL. 

 fig. 21. 



Pleurotomaria vittata. Phillips, Geo. of Yorkshire, IL p. 

 228, pi. 15, fig. 24. 



Shell conical, subturreted ; spire and body of nearly equal 

 length ; volutions vcntricose ; a broad, flat, spiral, mesial band 

 invests the body, somewhat lower than the centre ; surface 

 covered with longitudinal, slightly oblique strisp. 



Found in the Mountain Limestone, Ottcrburn and Bolland. 



18. P. scuLPTA — The Carved Pleurotomaria, pi. XL. fig. 

 22. 



Pleurotomaria sculpta. Phillips, Geo. of Yorkshire, IL p. 

 227, pi. 15, fig. 12. 



Shell conical, elongated ; body largo ; spire small, consisting 

 of three slightly inflated, tabulated volutions, each furnished 

 with three caringe, the spaces between which are provided with 

 very delicate stria; ; upper and under surfaces longitudinally 

 plaited. 



Found in the Mountain Limestone, Bolland. 



19. P. INTERSTRIALIS The Intcrstriated Pleurotomaria, 



pi. XL. fig. 23. 



Pleurotomaria interstrialis. Phillips, Geo. of Yorkshire, 

 IL p. 227, pi. 15, fig. 10. 



Shell oblong-ovate, pyramidal ; spire conical, of medium 

 length, consisting of four volutions, terminating in an acute 

 apex ; body invested by three rather prominent, spiral carinae, 

 each with two or three strong, spiral stria; between them ; base 

 convex, concentrically striate; aperture nearly orbicular; whole 

 surface covered with fine, longitudinal, fimbriated stria?. 



Found in the Mountain Limestone, Bolland. 



20. P. CARINATA. — The Keeled Pleurotomaria, pi. XL. fig. 

 24, 25. 



Pleurotomaria carinata. Phillips, Geo. of Yorkshire, IL p. 

 226, pi. 15, fig. 1. Helix carinatus, Sowerby, Min. Conch. I. 

 p. 34, pi. 10, upper and lower figures. 



Shell pyramidal ; body large ; spire small, consisting of four 

 flat-sided volutions, terminating in a rather acute apex; body 

 invested by a broad, flat, elevated, spiral, mesial band, emanat- 

 ing from the superior edge of the outer lip, winding along the 

 centre of the body, and continued at the base of each volution, 

 until it loses itself in the apical one; portion of the body below 

 the band smooth, as well as the base, which is furnished with a 

 pretty large, open umbilicus ; superior portion of tne body and 

 spire, as well as the band, covered by oblique stria?; aperture 

 large, and expanded laterally. 



Found in the Mountain Limestone at Settle, Yorkshire. 



21. P. TUMiDA The Tumid Pleurotomaria, pi. XL. fig. 



26. 



Pleurotomaria tumida. Phillips, Geo. of Yorkshire, IL p. 

 226, pi. 15, fig. 3. 



Shell subdepressed ; body large, tumid ; spire short, consist- 



Found in the Mountain Limestone at Bolland. 

 22. P. DUBIA — The Doubtful Pleurotomaria, pi 



XL. fiy 



27. 



Cirrus, probably C. rolundatus. Phillips, Geo. of York- 

 shire, p. 250, pi. 15, fig. 31. 



Shell cirriform, depressed, smooth ; spire small, consisting of 

 two flat volutions. 



Found in the Mountain Limestone at Bolland. 



23. P. GEMMUi.iFERA — The Gemmed Pleurotomaria, pi. 

 XL. fig. 28, 29. 



Pleurotomaria gemmulifera. Phillip-;, Geo. of Yorkshire, 

 II. p. 227, pi. 15, fig. 19. 



Shell subcouic, subdepressed; body large; spire small; volu- 

 tions convex above, and flat beneath ; edge nodular ; aperture 

 very large, transversely expanded ; the whole upper surface 

 covered by gemmuliferous, spiral strin'. 



Found in the Mountain Limestone, Bolland. 



24. P. MONiLiFERA — Tlic Nccklacc-striate Pleurotomaria, 

 pi. XL. fig. 30 and 34. 



Pleurotomaria monilifera. Phillips, Geo. of Yorkshire, IL 

 p. 227, pi. 15, fig. 10, a. 



Shell oblong-ovate ; superior portion of the body and spire 

 conical ; body with a large, prominent, spiral, mesial band on 

 its extreme edge, with a smaller one below, these extend to the 

 spire; aperture of moderate size; whole snrface covered with 

 moniliform, spiral stria?. 



Found in the Mountain Limestone at Bofland. 



25. P. coNCENTRiCA. — The Concentric Pleurotomaria, pi. 

 XL. fig. 31. 



Pleurotomaria concentrica. Phillips, Geo. of Yorkshire, II. 

 p. 228, pi. 15, fig. 23. 



Shell turreted ; vfith quadrate, subtabulate volutions above, 

 convex below ; umbilicus closed ; whole surface covered by 

 numerous, strong, spiral sulci, the basal furrows being the 

 largest. 



Found in the Mountain Limestone, Bolland. 



26. P. coNiCA The Conical Pleurotomaria, pi. XL. fig. 



32. 



Pleurotomaria conica. Phillips, Geo. of Yorkshire, II. p- 

 228, pi. 15, fig. 22. 



Shell conical; body vcntricose; spire consisting of five nearly 

 flat -sided volutions, ending in an acute apex; base umbilicated; 

 aperture large, subovate, laterally expanded; a bicarinate, spiral, 

 mesial band invests the lower portion of the body, and, ascend- 

 ing, winds round the base of the volutions of the spire, covered 

 with oblique, acutely elevated stria?. 



Ill some varieties the biiiul is tricarinate, with a sukiis separating the 

 two superior ones. 



Found in the Mountain Limestone of Derbyshire, and at 



Bolland. 



27. P. LiMBATA. — The Bordered Pleurotomaria, pi. XL. 



fig. 33. 



Pleurotomaria limhata. Phillips, Geo. of 'iorkshne, II. p. 



227, pi. 15, fig. 18. 



Shell conical, subdepressed; spire consisting of five rather 



ing of three rounded volutions, excavated above, as well as the flat-sided volutions ; base of the volutions, as well as the body, 



body; a broad, flat, spiral, mesial band invests the centre of the provided with numerous, oblique ribs; the superior margui of 



body ; whole surface covered with nearly obsolete, spiral strise, all the volutions nodular ; base flat, 

 and with longitudinal arcuated striae. Found in the Mountain Limestone at Bolland. 



