632 jioLi.uscA. 



13. Cucullaea; 14. IsocarJia; 15. Hiatella; 16. Cypiicardia ; 17. Cardita; 

 18. Cardium; 19. Venericardia ; 20. Ostygis; 22. Venus; 23. Cytherea; 

 24. Exolita ; 25. Cyprina ; 26. Lassea ; 27. Galatliea ; 28. Cyrena ; 29. Cy- 

 olas; 30. Crassina; 31. Capsa; 32. Donax ; 33. Liicina ; 34. Mysia; 35. 

 Corbis ; .36. Arcopagia ; 37. Tellinides ; 38. Telliuse ; 39. Psammotsea ; 40. 

 Psammobia; 41. Tellimya; 42. Sanguinolaria ; 43. Veiierupis ; 44. Petricola; 

 45. Saxicava; 46. Pandora; 47. Corlmla; 48. Araphidesina ; 49. Soleraya; 

 50. Ungulina ; 51. Erycina ; 52. Crassatella ; 53. Mactra ; 54. Lutraria ; 

 55. Anatina ; 56. Mya ; 57. Ligiila ; 58. Gallioraa ; 59. Magdala ; 60. Spinea ; 

 61. Glycimeris; 62. Panopea; 6.S. Solen ; 64. Gastrochcena; 65. Pholas , 

 C6. Teredo ; 67. Teredina ; 68. Septaria ; 69. Fistulana ; 70. Clavagella ; 7 1 

 Aspergillunj. Of which we have represented the following species : — 



Etheria elliptica.— The Oyal Etheria. Plate Ixxvii. fig. 19. Oval, flat, 

 teued, dilated towards tlie umbones; the apices remote- Inhabits the 

 Indian ocean. 



Chama ia^-arMS.— Lazarus's Cliama. Plate Ixxvii. fig. 20. With im- 

 bricated, dilated, waved foliations, and obsoletely striated ; of a white, 

 orange, red, or yellow colour; white witliin. Two inches in diameter. 

 Inhabits the American seas. 



Disceras arietina. — The Rara.Horned Disceras. Plate Ixxviii. fig. 7. 

 Somewhat heart-shaped, with divergent beaks. Fossel. 



Iridina Kilotica. — The Nile Iridina. Plate Ixxvii. fig. 22. Shell trans, 

 versely, oblong ; dark olivaceous green on the outside, somewhat wrinkled, 

 concentrically; inside, fine pearly, with iridescent reflections. Five inches 

 long. Inhabits the Nile. 



A7iadonta Cygnea. — The Swan Anadonta. Plate Ixxviii. fig 1. Ovate, 

 thin, convex, somewhat compressed on the anterior side ; with concentric 

 wrinkles ; covered with a green epidermis, frequently brown towards the 

 umbo ; inside pearly white ; beak small and ventricose. Three inches long 

 and seven broad. Inhabits fresh water lakes in Europe. 



Hyriaaviculares. — The Little-Bird Hyria. Plate Ixxviii. fig. 2- Umbones 

 smooth and produced ; ears large, with pointed terminations ; a greenish, 

 brown epidermis, and finely striated ; inside pearly, and of a fine reddish 

 golden. yellow. Three inches broad. Inhabits the rivers of America. 



Unio pictorum. — The Painter's Unio. Plate Ixxviii. fig. 3. Oblong-ovate, 

 strong, anterior side rhomboid and attenuated ; the opposite side obtusely 

 acute ; the umbones, somewhat warted ; with a dusky-green epidermis, and 

 concentrically wrinkled. Nearly three inches broad. Inhabits the rivers of 

 Europe. 



Castalia ambigua.— The Ambiguous Castalia. Plate Ixxviii. fig. 4. 

 Ovate, oblique, the umbones truncated ; longitudinally ribbed, \rith distant 

 transverse striae ; epidermis pale chestnut-brown; inside pearly. 



Tngonia pectinata. — The Toothed Trigcjiiia. Plate Ixxviii. fig. 5. Sub. 

 orbicular, with radiated or divergent, prominent, and somewhat scaly ribs ; 

 inside pearly ; margin crenulated. One inch and three fourths broad. In- 

 habits Australian seas. 



Nucula margaritacea. — The Pearly Nucula. Plate Ixxxvii. fig. 6. Ob. 

 liquely ovate, trigonal striae, and almost obsolete minute ; covered »vith a 

 greenish epidermis ; inside silvery.pcarlaceous ; margin crenulated ; and 

 having regularly pectinated teeth. One half inch long. Inhabits the Bri. 

 tish seas. 



