194 



CONCHIFERA. 



AxiNus. 



C. triangularis. Phillips, Geo. York, I. pi. 3, fig. 31. 



Sub-triangular, wedge-sliape J, anteriorsiile obliquely straight; 

 beaks pointed, surface smooth, with a few remote lines of 

 growth. 



The Coral Rag, Malton, Yorkshire. 



19. CucuLL^A CYLINDRICA. — The Cylindrical Cucullaea, pi. 

 LXXVIII. fig. 17. 



C. cylindrica. Phillips, Geo. York, I. pi. 9, fig. 20. 



Transversely elongated, cylindrical, and ventricose ; beaks 

 prominent, approximating, and situate towards the anterior 

 side ; posterior side with a ridge emanating from the beaks» 

 and terminating on the basal margin ; surface with many 

 elevated, concentric ridges. 



Great Oolite, White Nab, Yorkshire. 



20. CucdlLjEA concinna. — Neat Cucullaea, pi. LXXVIII. 

 fig. 18. 



C. concinna. Phillips, Geo. York, I. pi. 5, figs. 9 and 

 31. 



Transversely elongated ; short ; moderately inflated, beaks 

 rather large ; anterior side rounded ; posterior side obliquely 

 truncated and flattened, with a ridge from the beak to the 

 margin, and longitudinally striated ; anterior side obscurely 

 ribbed ; hinge-line lengthened ; base gently curved. 



The Oxford Clay, Scarborough, and the Kelloways Rock, 

 Cove. 



21. CucuLL^A iMPERiALis. — The Imperial Cucullwa, pi. 

 LXXVIII. fig. 20. 



C. imperialis. Phillips, Geo. York, I. pi. 9, fig. 19. 



Transversely lengthened ; inflated ; anterior side rather 

 short ; posterior side hollow, considerably elongated ; beaks 

 very large, prominent, incurved, and approximate ; superior 

 portion of the surface with wide-set radiating stria;, extending 

 downwards for more than half the length of the valve ; crossed 

 by remote concentric lines of growth ; basal line nearly 

 straight, with a slight hollow near the centre. 



The Great Oolite, Cloughton Wyke. 



22. CucuLL^A ARGDTA — The Sharp Cucullasa. 



C. arr/uta. Phillips, Geo. York, II. p. 210, pi. 5, fig. 20. 



Transversely lengthened ; posterior side angulated ; beaks 

 situate near the anterior side ; surface with deep regular fur- 

 rows parallel to the margin. 



The Carboniferous Limestone, Bolland, Yorkshire. 



23. CucuLL^A OBTUSA. — The Obtuse Cucullasa. 



C. ohtusa. Phillips, Geo. York, II. p. 210, pi. 5, fig. 19. 



Transversely leugthened ; oblong-oval ; anterior side short, 

 a little inflexed ; posterior side obliquely sub-truncated and 

 reticulated ; hinge-line and base nearly parallel ; beaks rather 

 large and obtuse. 



24. CucULL^A DEPRESSA. — The Depressed Cucultea. 

 C. depressa. Phillips, Pal. Fos. p. 42, pi. 17, fig. 71. 

 Oblique ; sub-triangular ; its breadth and length nearly 



equal ; cardinal area narrow ; surface smooth. 



The Devonian Strata, Marwood. 



2.5. CucuLLvEA AMYGDALiNA. — The Almond-shapod Cucul- 

 l;ea. 



C. araygdalina. Phillips, Pal. Fos. p. 40, pi. 18, fig. 66. 



Transversely elongated ; width double its length ; anterior 

 ^de short and rounded ; posterior side much acuminated and 

 somewhat depressed, with a ridge extending from the beaks to 



the extreme point below ; surface with concentric lines of 

 growth ; beaks obtuse. 



The Devonian Shales, Marwood, North Devonshire. 



26. CucntLjEA Hardingii. — Harding's CucullcBa. 



C Hardingii. Sowerby, Geo. Tr. 2d Ser. V. pi. 53, figs. 

 26, 27. Phillips, Pal. Fos. p. 40, pi. 18 and 19, fig. 67. 



Transversely oblong-oval ; posterior side large and obliquely 

 sub-truncated ; anterior short and rounded ; beaks rather large 

 and rounded, and obtuse ; surface smooth. 



Devonian Shales, Marwood, North Devon. 



27. CucuLLJJA ANGUSTA. — The Narrow Cucultea. 



C. angusta. Sowerby, Geo. Tr. V. pi. 53, fig. 25. Phil- 

 lips, Pal. Fos. p. 41, pi. 19, fig. 68. 



Sub-quadrangular, length exceeding the width ; convex ; 

 anterior side rounded ; posterior side truncated, angular above 

 and a little so below; beaks small, nearly central; surface 

 smooth. 



The Devonian Rocks, Marwood. 



28. CucuLL.a:A sulcata. — The Furrowed Cucullasa. 

 C. sulcata. Sowerby, Geo. Tr. 2d Ser. III. p. 119. 



29. Cdcull/EA trapeziform. — The Trapeziform Cuculljea. 

 C. trapezium. Sowerby, Geo. Tr. 2d Ser. V. pi. 53, fig. 



23. Phillips, Pal. Fos. pi. 19, fig. 70. 



Nearly quadrangular, or trapezoidal ; convex ; anterior side 

 rounded ; posteriorly truncated and large ; surface smooth ; 

 hiuge-line sub-triangular ; beaks rather prominent. 



The Devonian Shales, Marwood, North Devon. 



30. Cucull^a unilateralis. — 



C unilateralis. Sowerby, Geo. Tr. 2d Ser. V. pi. 53, fig- 



24. Phillips, Pal. Fos. p. 41, pi. 19, fig. 69. 



Obliquely ovate ; inflated; posterior side oblique, flattened ; 

 beaks nearest the anterior side, which is short and slightly 

 rounded. 



The Devonian Shales, Marwood, North Devon. 



Genus XIIL— AXINUS.— ,%?«%. 



Shell equivalve, transverse, free, posterior side very short, 

 rounded ; hinge provided with a long, oblique ligament, situate 

 iu a furrow, stretching along the whole edge ; anterior side 

 considerably produced, angulated, and somewhat obliquely 

 truncated, with a flattish lunette near the beaks. 



1. AxiNus (?) LATUS. — The Broad Axinus, pi. LXXIX. 

 fig. 4. 



Transversely elongated ; beaks blunt, placed much to the 

 anterior side, which is short, and gently rounded ; posterior 

 side much lengthened, and .somewhat acuminated ; breadth 

 double its length ; basal line very little curved ; surface 

 smooth. 



In the Sandstone, Vale of Todmorden Yorkshire. 



2. AxiNus DUBius. — The Doubtful Axinus, pi. LXXIX. 

 fig. 8. 



Transversely elongated, slightly curved ; anterior side short, 

 and somewhat narrowed ; posterior side lengthened and broad ; 

 basal line moderately arcuated. 



Sandstone, Vale of Todmorden. 



3. AxiNos OBSCDRUS. — The Obscure Axinus, pi. LXXIX. 

 figs. 5, 6, 7. 



