254 



MOLLUSC A. 



SCALARIA. 



Conical; spire abruptly tapering, with about five rounded 

 volutions; aperture orbicular; umbilicus closed; length one 

 inch, width four lines. 



The Upper Ludlow Rocks, Larden, near Ludlow, &c. &c. 



3. TuEBO EXPANSA. — The Expanded Turbo, pi. XXXIII. 

 figs. 54, 55. 



T. expansa. Brown, Wern. Mem. VIII. pi. 1, figs. 12, 13. 



Body very large , spire small, with an acute apex ; aperture 

 sub-orbicular ; inner lip thickened and slightly concave ; surface 

 minutely striated spirally, alternately larger and smaller. 



The Pleistocene Marine Formation, Dalmuir, on the Clyde. 



Genus PYRAMIS.— B/wk. 



Shell generally subulate, gradually tapering to a point ; body 

 usually short, and the spire long ; volutions but slightly divided 

 by the suture in most species, and seldom inflated ; aperture 

 mostly oblong-ovate, placed nearly perpendicular, with its upper 

 angle contracted for the most part ; outer lip rarely continuous. 



1. Pyramis reticulatus. — The Reticulated Pyramis, pi. 

 XXL* figs. 4-2, 43. 



P. reticulatus. Brown, Tr. Man. Geo. Soc. p. 229, pi. 7, 

 figs. 42, 43. 



Shell subulate ; body shorter than the spire, which consists 

 of si.x; inflated, rapidly decreasing volutions, well defined by a 

 deep suture, and terminathig in an acute apex ; aperture slightly 

 ovate, contracted above, and rounded below ; pillar lip not 

 reflected on the columella ; outer lip thin, plain, and sharp on 

 the margin ; whole shell decussated with fine distinct, spiral, 

 and longitudinal stris. Length five-eighths of an inch, diameter 

 nearly three-eighths. 



In the Coal Shale, Crimsworth Dean, near Hebden Bridge, 

 and is in the Manchester Museum. 



3. Pyramis Oweki. — Owen's Pyramis, pi. XXL* f. 44, 45. 



P. Oweni. Brown, Tr. Man. Geo. Soc. I. p. 223, pi. 7, 

 figs. 44, 45. 



Shell subulate, smooth ; body short, about a third of the 

 length of the shell ; spire long, and consisting of six well 

 defined, moderately inflated, and slightly oblique volutions, 

 terminating in an obtuse apex ; aperture sub-rotund, a little 

 contracted above, rounded beneath ; outer lip strong, and even. 

 Length a quarter of an inch, diameter a tenth of an inch. 



In the Coal Shale, Crimsworth Dean, near Hebden Bridge, 

 and is in the Manchester Museum. 



Conical, with three or four much-inflated volutions ; base 

 convex ; smface with fine longitudinal lines of growth, 



The Lower Silurian Rocks, Horderly and Wistantow, Wales. 



2. LiTTOEiNA PUNCTURA. — The Puncturod Littorina, plate 

 XXXIIL* fig. 57. 



L.punctura. Bean, Mag. Nat. Hist. 1839, p. 62, fig. 23. 



Sub-conic, ventricose ; body and spire nearly of equal length, 

 the latter with five inflated volutions ; surface with numerous 

 regular longitudinal lines of small punctures. 



In the Cornbrash, Scarborough. 



3. Littorina breve. — The Short Littorina, pi. XXXII. 

 fig. 14. 



Buccinum breve. Sowerby, VI. p. 128, pi. 566, fig. 3. 



Nearly globular ; spire short, consisting of three moderately 

 rounded volutions, scalloped on their upper edges as they pass 

 over a row of obtuse tubercles ; body with three or four trans- 

 verse remote rows of blunt tubercles ; aperture sub-orbicular, 

 with a slight hollow at its upper angle. 



In the Carboniferous Limestone, Bradley, near Newton 

 Bushel, Devonshire. 



1. Thochus Tathami. — Tatham's Trochus, pi. XXXIIL* 

 figs. 50, 51, 52. 



Sub-conic, with five slightly inflated volutions, terminating 

 in a rather obtuse apex ; aperture transversely ovate ; outer lip 

 blunt ; surface smooth, with a few slight lines of growth, and 

 a hollow zone around the body. 



The Carboniferous Limestone, near Settle, Yorkshire. 



2. Trochus inflatus. — The Inflated Trochus, pi. XXXIIL 

 figs. 60, 61. 



T. inflatus. Brown, Wern. Mem. VIII. pi. 1, figs. 10, 11. 



Sub-conic, with five tumid volutions, deeply defined by the 

 suture ; base largely umbilicate ; aperture somewhat quadran- 

 gular, pearly witliin surface covered with strong spiral striae, 

 and intermediate smaller ones, crossed by extremely minute 

 longitudinal strise ; the superior edge of each volution with a 

 series of indistinct tubercles. 



The Pleistocene Marine Formation, Dalmuir, on the Clyde. 



3. Trochus helicites. — The Helix-like Trochus, plate 

 XXXIIL* figs. 59 and 64. 



T. helicites. Sowerby, Sil. Syst. p. 603, pi. 3, figs, le and 5. 



Depressed above, convex beneath ; smooth, with four volu- 

 tions, which are rather flattened above, obtusely angular at the 

 margin of the base ; umbilicus small and deep. 



In the Old Red Limestone, Horeb Chapel, Felindre. 



1. Littorina steiatella. — The Fine-Striated Littorina, 

 pi. XXXIIL* fig. 79. 

 L. striatella. Sowerby, Sil. Syst. p. 642, pi. 19, fig. 12. 



1. Scalaria pulchea. — The 

 XXXIIL* fii?. 63. 



Handsome Scalaria, plate 



