Catillus. 



CONCH I FEU A. 



1G7 



Inoceramia sulcatum. Sowcrby, III. p. 181, pi. 30G. 



Oblong, inequivalve, boaks promincut, that of one valvo in- 

 curved and acute ; surface with about nine large longitudinal 

 plaits. 



The Chalk Slarl, Cambridge and Beerhead ; and the Gault, 

 Folkstone, Ringmer, JIaiJstouo, and Vale of AVardour. 



14. Catillus oBLiQUATUs. — Tho Obliijuo Catiilus, pi. 

 LXVII. fig. 23. 



C. obliipiatus. Brown, Trans. Manch. Geo. Soc. I. p. 22G, 

 pL 7, fig. (.'.0. 



Ovate, smooth ; umbonos rather large, and placed consider- 

 ably to one side ; surface with several distinct linos of growth; 

 sides unequal, one considerably produced, the other short and 

 nearly straight. 



Carboniferous Limestone Shale, High-Green Wood, Vale of 

 Todraorden. 

 15. Catillus l^vis.— The Smooth Catillus, pi. LXVII. f. 22. 



C. /(pcis. Brown, Trans. jNIanch. Geo. Soc. Trans. I. p. 

 226, pi. 7, fig. 67. 



Oblong-ovate, smooth ; with numerous concentric, nearly 

 obsolete wrinkles ; umbones small, rounded, and but slightly 

 produced. Length nearly three-fourths of an inch ; breadth 

 half an inch. 



The Carboniferous Limestone Shale, High-Green Wood, 

 Vale of Todmorden. 



16. Catillos Kirkmani. — Kirkman's Catillus, pi. LXVII. 

 fig. 24.. 



C. Kirkmani. Brown, Trans. Manch. Geo. Soc. I. p. 225, 

 pi. 7, fig. Gfi. 



Oblong-ovate, convex, smooth ; sides nearly equal, marked 

 with four concentric lines of growth ; umbones prominent, 

 central, and rounded, with several inequidistant, concentric 

 lines of growth ; margins sharp and even. 



The Carboniferous Shale, High-Green Wood, Vale of Tod- 

 morden. 



17. Catillus costatus. — ^The Ribbed Catillus, pi. LXVII. 

 fig. 25. 



C. coslatus. Brown, Trans. Manch. Geo. Soc. I. p. 226, 

 pi. 7, fig. 68. 



Oblong-ovate ; with numerous very flat, longitudinal, diver- 

 gent small ribs emanating from the umbones and termiuating 

 on the margins ; these are crossed by numerous distinct lines 

 of growth. Leugth half an inch ; breadth, three-eighths. 



18. Catillcs Kellyii. — Kelly's Catillus, pi. LXVIII. 

 % 17. 



C. Kellyii. Brown, Trans. Manch. Geo. Soc. I. p. 226, pL 

 7, fig. 73. 



Mytilliforni, elongated, smooth, with concentric lines of 

 growth ; umbiines small, rounded, and considerably turned to 

 one side ; valves narrow above, wide and rounded towards the 

 base. 



The Carboniferous Limestone Shale, High-Green Wood, 

 Vale of Toilmordcn. 



19. Catillus minctus. — The Minute Catillus, pi. LXVIII. 

 figs. 18, VJ. 



C. tninulus. Brown, Trans. Manch. Geo. Soc. p. 226, pi. 7, 

 figs. 71, 72. 



Modiolifomi, much elongated, smooth, with distinct, con- 

 centric lines of growth ; umbones small, rouudcd, and placed 



to one side. Length about one lino ; breadth two-thirds its 

 length. 



The Carboniferous Limestone Shale, High-Green Woodi 

 Vale of Todmorden. 



20. Catillu.s Crispii. — Crisp's Catillus, pi. LXI. *** f. 8, 9. 



C. Crispii. Mantell, Geo. Sus. I. p. 133, pi. 27, fig. 11. 



Obovate, greatly compressed, with numerous transverse 

 ridges ; beaks acuminated ; posterior side email, depressed ; 

 anterior side expanded ; hinge-lino oblique. 



In the Red Chalk, lluustautou, and the Gault, Folkstone 

 and Ilamsey. 



21. Catillus Lamarckii. — Lamarck's Catillus, pi. LXI.*** 



Inoceramiu- Lamarckii. Mantell, Geo. Suss. p. 21 4, pi. 27, 

 fig. 1. 



Valves equal, very convex, with a few obscure longitudinal 

 undulations, and distant transverse ridges; surface covered 

 with numerous concentric stria; ; posterior side sub-com- 

 pressed or slightly concave ; anterior side lobatc and expanded, 

 separated from the body of the valve by a deep furrow ; hinge- 

 line nearly transverse. 



In the Chalk, Lewes and Norfolkshire. 



22. Catillus tri«onus. — The Trigonal Catillus. 



Inoceramns Irigonns. Portlock, Geo. Sur. p. 422, pi. 33, f. 4. 



Much elongated, nearly throe-sided, compressed ; the flat- 

 tened arch strongest at the beak ; beaks rather shai-p, and re- 

 flected towards the hinge-line ; surface with irregular, concen- 

 tric wrinkles, between each a series of fine stria> ; hinge-liue 

 greatly oblique and extending downwards, being equal to 

 nearly half the length of the shell, and broadest at the end of 

 the hinge-line. 



Silurian Limestone, Tyrone, Ireland. 



23. Catillus contortus. — The Contorted Catillus. 

 Inoceramus contortus. Portlock, Geo. Sur. p. 422, pi. 3-3, 



fig. 5. 



Elongated; hinge-liue short; beaks incurved; the entire 

 shell much arcuated, giving it a twisted appearance; surface 

 with fine concentric wrinkles and striie. 



Silurian Limestone, Tyrone, Ireland. 



24. Catillus tenuis. — The Thin Catillus. 

 Inoceramus tenuis. Mantell, Geo. Suss. p. 132. 



Both valves regularly convex and deepest in the middle : 

 beaks convex, incurved ; hinge-line short, rallier oblique ; pos- 

 terior side small and lunulate ; surface with numerous lamel- 

 lated, concentric wrinkles, generally about four inches long, 

 and three wide ; substance of the shell thin. 



25. Catillus transversus. — The Transverse Catillus. 

 Inoceramus transversus. Portlock, Geo. Sur. p. 423, pi. 33, 



fig. 11. 



Transversely elongated, considerably flattened, but more 

 inflateil towards the beaks; hinge-line long, straight, horizon- 

 tal ; beaks placed towards the on-1, and rather indistinct ; sur- 

 face with shallow concentric undulations. 



Siluri.-in Limestone, Tyrone, Ireland. 



26. Catillus pernoides.— The Pcma-liko Catillus. 

 Jnoccramu-s /lenioiJc!. Portlock, Geo. Sur. p. 567, pi. 38, f. 5. 

 Elongated; hinge-line considerably oblique, forming an 



angle of thirty degrees ; beaks acute, and slightly curved, 

 smooth. 



The Carboniferous Limestone, Derryloran, Ireland. 



