174 



throughout, which is characteristic of their habits, they present a great 

 variety of form and sculpture. Some, as in M. mhulata, are merely spirally 

 striated, and very sharply acicular ; others, like M. amarula, are conspi- 

 cuously coronated, and the modifications of growth between these extremes 

 are exceedingly numerous and well-defined. Two sections may be noticed 

 as having a stronger title to be distinguished as subgenera than the rest. 

 Those of a dwarfed, solid, globose form {Anculotus, Say), and those in 

 which the aperture is attenuated into a short canal (lo, Lea), as repre- 

 sented at Fig. 98. 



As this genus has never been monographed, the list of species which 

 follows is unavoidably very far from complete. Many more are known 

 than have been as yet described. 



1. acutocarinata, Lea. 



2. altilis, id. 



3. amarula, Lamarck. 



4. annulifera, Conrad. 



5. armigera, Say. 



6. asperata, Lamarck. 



7. aspirans, Hinds. 



8. aurita, Rang. 



9. Babylonica, Lea. 



10. batana, Gould. 



11. bellicosa, Hinds. 



12. blanda, Lea. 



13. Boykiniana, id. 



14. caliginosa, id. 



15. canaliculata, Say. 



16. carinifera, Lamarck. 



17. castanea, Lea. 



18. catenaria, Say. 



19. catenoidea, Lea. 



20. Celebensis, Quoy. 



21. Cmcinnatiensis, Lea. 



22. circinata, id. 



23. clavaeformis, id. 



24. coarctata, Lamarck. 



25. columella, Lea. 



26. comma, Conrad. 



27. concinna, Lea. 



28. conica, Say. 



29. coronata, Philippi. 



Species. 



30. corrugata, Lamarck. 



31. costata, Quoy. 



32. costulata, Lea. 



33. crassa, Philippi. 



34. crebristriata, Lea. 



35. crenulata, Deshayes. 



36. Curreyana, Lea. 



37. decollata, Lamarck. 



38. decora, Lea. 



39. depygis, Say. 



40. dubiosa, Lea. 



41. Duttoniana, id. 



42. ebenum, id. 



43. Edgariana, id. 



44. elevata, Say. 



45. erythrostoma, Quoy. 



46. exarata, Lea. 



47. fasciolata, Olivier. 



48. figurata, Hinds. 



49. flammulata, Philippi. 



50. florata, Hinds. 



51. Florentiana, Lea. 



52. fulgurans, Hinds. 



53. fuliginosa, Lea. 



54. fumosa, Hinds. 



55. funiculus, Qwoy. 



56. fuscata, Desliayes. 



57. fusiformis, iea. 



58. gaudiosa, Hinds. 



59. glaus, Philippi. 



60. globula, Zea. 



61. gracilis, id. 



62. granifera, Lamarck. 



63. granum, Philippi. 



64. Helvetica, Michaud. 



65. Hildrethiana, Ze«. 



66. Holstonia, zc?. 



67. Hydii, Conrad. 



68. inermis, Sowerby. 



69. inquinata, Def ranee. 



70. isogonia, /Say. 



71. Kirtlandiana, Zea. 



72. Ia3ta, Zay. 



73. laevigata, Lea. 



74. Isevissima, Soicerby. 



75. laqueata, /&?y. 



76. latebrosa, Hinds. 



77. Lecontiana, im. 



78. lima, Conrad. 



79. lineata, Say. 



80. lirata, Menke. 



81. luctuosa, Hinds. 



82. moesta, w?. 



83. mitra {Helix), Meusch. 



84. Moluccensis, Quoy. 



85. monozonalis, Zm. 



86. multilineata, Say. 



87. mutilata, id. 



