CuCULL^A. 



CONCHIFERA. 



193 



Obliquely wedgo-shaped ; length and breadth nearly equal ; 

 anterior side pointed, with a ridge running from the beaks to 

 the margins ; surface very smooth. 



Greensand, Blackdown. 



6. CrcrLL.F.A FIBROSA. — Tiio Fibrous Cuculloea, pi. 

 LXXVII. fig. in. 



C. fibrosa. Sowerby, III. p. 9, pi. 207, fig. 2. 



Gibboso, ovate ; width somewhat more than the length ; an- 

 terior margin straight, and prominent near the hinge ; surface 

 with numerous elevated, longitudinal strioe, crossed by lines of 

 growth. 



Greensand, Blackdown. 



7. CucuLL.EA ELON'GATA. — The Elongated CuculhTa, pi. 

 LXXVIII. 6g. 19. 



C. dongata. Sowerby, V. p. fi*, pi. 447, fig. 1 . 



Elongated, its widtii nearly thrice its length, sub-cylindrical ; 

 anterior side pointed ; posterior side very short ; beaks small, 

 incurved, and remote from the anterior side ; whole surface 

 covered with very fine longitudinal strim. 



The Coral Rag, Malton and Cove ; the Inferior Oolite, 

 Crosshands, Yorksiiire ; and the Lias, Vale of Gloucester. 



8. CrcuLL.EA cosTELLATA. — The Small-ribbed CucullsBa, 

 pi. LXXVIII. fig. 7. 



C. costellata. Sowerby, V. p. 67, pi. 447, fig. 2. 



Gibbose, transversely oblong, breadth being about twice 

 its length ; the general outline being an oblique parallelogram ; 

 anterior lobe wing-shaped and strongly ribbed, with interrae- 

 iliate striic between them, and with a carinated division se])a- 

 rating it from the disk ; posterior side roumled and ribbed ; 

 l>eaks distinct from each other, and sharp-pointed ; whole sur- 

 face covered with longitudinal strire, distant in some specimens, 

 and numerous in others, slightly decussated by lines of growth. 



The Lower Greensand, Seabrook, Kent. 



9. CrccLL.EA .Mi.vuTA. — The Minute Cucullasa, pi. 

 LXXVII. fig. 37. 



C. minuta. Sowerby, V. p. 68, pi. 447, fig. 3. 



Convex, ovate, elongated, its width being more than double 

 its length, and smallest at the extremities, the ridge which 

 divides the anterior lobe forming a projecting angle upon the 

 margin ; anterior side rather small, very obliquely truncated ; 

 beaks nearly close ; surface longitudinally striated. 



The Great Oolite, Andiff, AViltshire. 



10. CucclljEa radis. — The Rough CucuUaja, pi. LXXVIL 

 tig. 22. 



C. radis. Sowerby, V. p. 68, pi. 447, fig- 4. 



Convex, transversely oblong ; beaks incurved, and nearly 

 meeting ; surface nigged, and longitudinally ribbed ; anterior 

 lobe ill-defined ; disk deeply .striated. 



The Great Oolite, Anclifi*, Wiltshire. 



11. CncuLLiEA OBLONGA. — The Oblong CucuUica, pi. 

 LXXVII. fig. 2.5. 



C. ohlonga. Sowerby, III. p. 7, pi. 206, figs. 1,2; Phillips, 

 Geo. York, I. pi. 3, fig. 34. 



Gibbose, transversely oblong, its width about twice its 

 length ; anterior side wedge-shaped ; front inclining slightly 

 to the posterior side, which is small ; beaks elegantly iu- 

 curved ; hinge area rhomboidal, with from nine to twelve 

 parallel lozenges ; surface with numerous longitudinal, irre- 

 gular, elevated strio!. 



Coral Rag, Malton, Yorkshire, and Inferior Oolite, Dundry. 



12. Cccnn,.EA CANCELLATA. — The Cancellated Cuculkea, 

 pi. LXXVII. fig. 18, and pi. LXXVIII. fig. 16. 



C. cancellata. Phillips, Geo. York, I. pi. 19, fig. 24, and 

 pi. 11, fig. 44. 



Obliquely sub-ovate; hinge-line straight and oblique, and 

 acute at both extremities ; ligamcntal area narrow ; beaks 

 small, approximating ; anterior side gently curving ; posterior 

 side depressed, and nearly^obliquely straight ; a ridge, emana- 

 ting from the beak, diverges to the base, which is arcuated ; 

 surface decussated with transverse and lougitudinal stri;c. 



The Great Oolite, Cloughton, and Inferior Oolite, Blue 

 Wick. 



13. CucuLL^A CRASSATi.xA. — The Thickened Cucullaea, pi. 

 LXXVII. fig. 39. 



C. crassatina. Lamarck, An. du Mus. 6, p. 338. C. de- 

 eussata. Sowerby, III. pi. 206, figs. 3, 4. 



Gibbose, transversely ovate, about one-fifth wider than long, 

 anterior side angular ; surface with somewhat flattened longi- 

 tudinal ridges, and decussated by fine close lines of growth ; 

 interior margin crenated ; teeth of the hinge striated on their 

 sides ; lines beneath the cartilage few. 



The London Clay, Feversham and Heme Bay. 



14. CiicuLLJEA co.NTRACTA. — The Contracted Cuculhea, 

 pi. LXXVII. fig. 21, 



C. coiilracla. Phillips, Geo. York, I. pi. 3, fig. 30. 



Obliquely sub-quadrangular, inflated ; hinge area of moderate 

 width ; beaks large, rather obtuse ; base rather straight ; 

 surface smooth. 



The Coral Rag, Malton, Yorkshire. 



1.5. CncuLL.EA RETICULATA. — The Reticulated Cuculhea, 

 pi. LXXVIII. fig. 13. 



C. reticulata. Phillips, Geo. York, I. pi. II, fig. IS. 



Transversely elongated ; rather inflated ; anterior side 

 large and rounded ; posterior side narrowed ; straight and 

 oblique above, and obliquely truncated, with a produced angle 

 below ; beaks very large and obtuse ; base slightly hollowed ; 

 surface with longitudinal radiating striiu on the anterior side 

 and middle, crossed by transverse shallow ridges, producing 

 a reticulated appearance. 



The Inferior Oolite, Yorkshire. 



16. CncuLL,«A oviFORMis. — The Egg-shaped Cuculla;a, 

 pi. LXXVIII. fig. 3. 



a Sowerby, Sil. Syst. pi. 3, fig. 1. 



Transversely oviform, hinge-line curved ; anterior .side 

 rounded, posterior side narrowed ; base and back a little ar- 

 cuated ; surface smooth. 



Old Red Sandstone, Ludlow. 



17. CucuLLJj.*. PECTIN ATA. — Thc Pcctiuated Cuculla.'a, jd. 

 LXXVIII. fig. .5. 



C. jicclinata. Phillips, Geo. York, I. pi. 3, fig. 32. 



Transversely elongated ; beaks obtuse, placed near the an- 

 terior side, which is somewhat rouudcd ; posteror side a little 

 produced below ; back and base gently curved ; surface " itli 

 numerous radiating stria) crossed by remote equidistant lines 

 of growth. 



The Coral Rag, Malton, Yorkshire. 



18. CucuLL.EA TRIANGULARIS. — The Triangular Cuculhea, 

 pi. LXXVIII. fig. 6. 



2 T 



