112 



MOLLUSCA. 



Spirifer. 



45. Spirifer t^iniata The Filleted Spirifer, pi. LI. 



fig. 19. 



Spirifera tcBuiata. Phillips, 11. p. 219, pi. 10, fig. 17- Sjn- 

 rifera lineata, Phillips, p. 219. 



Nearly orbicular, smooth ; cardinal area narrow, transversely 

 filleted ; mesial fold obsolete. 



Mountain Limestone, BoUand and Queen's County. 



46. Spirifer oblatus. — The Raised Spirifer, pi. LL 

 fig. 20. 



Spirifer oblatus. Sowerby, III. p. 123, pi. 268. 



Gibbose, transversely obovate, its width somewhat more than 

 its length, very smooth ; mesial rib rather depressed ; the cor- 

 responding furrow in the other valve flattened in the middle ; 

 beaks approximate ; foramen of the cardinal area triangular. 



Mountain Limestone, Westmoreland, Derbyshire, and Flint- 

 shire. 



47. Spirifer elliptica The Elliptical Spirifer, pi. LI. 



fig. 21. 



Sjdrifera elliptica. Phillips, H. p. 219, pi. 10, fig. 16. 



Transversely oval ; beaks not much produced ; mesial fold 

 obtuse, and broad ; surface with wide, somewhat irregular rays, 

 and concentrically striated ; cardinal area ilat, smooth. 



Mountain Limestone, BoUand ; Queen's County, Ireland. 



48. Spirifer obtusa The Obtuse Spirifer, pi. LI. 



fig. 22. 



Spirifer obtusus. Sowerby, III. p. 124, pi. 269, two lower 

 figures. Fleming, p. 375. 



Gibbous, transversely ovate; with nearly obsolete, longitudi- 

 nal stria? ; central elevation obtuse, and rounded ; beaks blunt, 

 and distant. Width nearly double its length. 



Differs from S. glabra, in the central elevation not being flattened 

 along the middle, with a deeper sinus at its edge; the umbo in the lower 

 valve also considerably more produced. 



Mountain Limestone at Scaliber, near Settle, Yorkshire. 



49. Spirifer symmetrica The Symmetrical Spirifer, 



pi. LI. fig. 23. 



Spirifera symmetrica. Phillips, 11. p. 219, pi. 10, fig. 13. 



Subquadrate, very gibbous, smooth ; with a wide mesial fold, 

 which is sometimes divided in the middle ; beaks pointed, in- 

 curved, and remote; the umbo of the lower valve greatly larger 

 than the other. 



Mountain Limestone, Bolland. 



50. Spirifer lata. — The Broad Spirifer, pi. LI. fig. 24. 

 Spirifera glabra. Phillips, 11. p. 219, pi- 10, fig. 12. 

 Gibbous, considerably elongated transversely, its breadth 



being more than double its length, smooth ; mesial fold ele- 

 vated, round, and subdepressed ; with obscure, lateral radia- 

 tion ; umbones blunt, and short. 



Mountain Limestone, Arran and Derbyshire. 



51. Spirifer glabra. — The Smooth Spirifer, pi. LI. fig. 

 27, 28, 29. 



Spirifer glabra. Sowerby, III. p. 123, pi. 269, two upper 

 figures. Fleming, p. 375. Phillips, IL p. 219, pi. 10, fig. 10, 

 11. Anomites glaber, Martin, Pet. Derb. pi. 28, fig. 9, 10. 



Gibbous, rounded, smooth ; umbones subacute, approxima- 

 ting ; mesial fold rounded, depressed in the middle ; margins 

 sharp ; indistinct lines of growth. 



This species is subject to variety in its form. 



Mountain Limestone, Bolland, Derbyshire, Arran, Ireland, 

 and Isle of Man. 



52. Spirifer imbricata. — The Imbricated Spirifer, pi. 

 LI. fig. 25. 



Spirifera imbricata. Phillips, 11. p. 220, pi. 10, fig. 20. 



A short, transverse ellipsis ; mesial fold obsolete ; umbones 

 approximate ; surface with strong, radiating stria;, crossed by 

 concentric, imbricated laminse, which interrupt the striaj. 



Mountain Limestone, Derbyshire, Northumberland, and 

 Bolland. 



53. Spirifer decora. — The Adorned Spirifer, pi. LI. 

 fig. 26. 



Spirifera decora. Phillips, 11. p. 219, pi. 10, fig. 9. 



Almost orbicular, convex; umbones prominent; beaks rather 

 acute ; cardinal area triangular, wide ; mesial fold rather indis- 

 tinct, and slightly divided below ; surface with obscure, nearly 

 obsolete radiations. 



Mountain Limestone, Bolland. 



54. Spirifer linguifera. — The Tongue-shaped Spirifer, 

 pi. LI. fig. 14. 



Spirifera linguifera. Phillips, 11. p. 219, pi. 10, fig. 4. 



Slightly oblong longitudinally, convex, destitute of angles . 

 mesial fold rounded, prominent ; umbones produced, approxi- 

 mating, and with rather obtuse beaks; lateral radiations ob- 

 scure ; lines of growth indistinct. 



Mountain Limestone, Bolland. 



Section V. — Terebratulifokmes. — Destitute of a 

 cardinal area. 



55. Spirifer squamosa — The Scaly Spirifer, pi. LII. 

 fig. 1. 



Spirifera squamosa. Phillips, 11. p. 220, pi. 10, fig. 21. 

 Depressed, transversely oblong-ovate ; mesial fold small ; 

 smooth, with transverse imbrications ; umbones approximating. 

 Mountain Limestone, Kendal and Florence Court. 



56. Spirifer fimbriata -The Fringed Spirifer. 



Spirifera Jimbriata. Phillips, 11. p. 220. 



" Orbicular, depressed ; beak of the lower valve prominent, 

 but small ; surface strongly radiated, and concentrically imbri- 

 cated." 



Mountain Limestone, Florence Court. 



57. Spirifer planosulcata The Flat-furrowed Spirifer, 



pi. LIL fig. 4. 



Spirifera planosulcata. Phillips, 11. p. 220, pi. 10, fig. 15. 

 Somewhat pentaedral, depressed ; the central furrows in each 

 valve flattened ; umbones approximate. 



Mountain Limestone, Bolland and Queen's County. 



58. Spirifer espansa. — The Expanded Spirifer, pi. LII. 

 fig. 5. 



Spirifera e.rpayisa. Phillips, 11. p. 220, pi. 10, fig. 18. 



Transversely subovate, compressed ; destitute of a mesial 

 fold; with fine, longitudinal radiations, crossed by concentric 

 stria;. 



Mountain Limestone, Bolland. 



59- Spirifer globularis The Globular Spirifer, pi. 



LIL fig. 12. 



Spirifera globularis. Phillips, II. p. 220, pi. 10, fig. 22. 



Subglobose, smooth ; umbones obtuse, approximating; mesial 

 fold broad. 



Mountain Limestone, Bolland. 



