161 



10. aurantia, Recluz. 



11. balteata, Reeve. 



12. Beaniana, Recluz. 



13. Bernhardi, id. 



14. bisecta, Reeve. 



15. bullula, id. 



16. chlorostoraa, LamJc. 



17. chrysostoma, Recluz. 



18. comma-notata, Reeve. 



19. costata, Chemnitz. 



20. Deshayesii, Recluz. 



21. Douibeyi, «'<?. 



22. electrina, Reeve. 



23. erubescens, iof. 



24. Essingtoni, Recluz. 



25. exuvia, Linnaeus. 



26. filosa, Reeve. 



27. fragum, z'^. 



28. fulgurans, G-melin. 



29. fuliginata, Reeve. 



30. funiculata, zrf. 



31. geramulata, «^. 



32. genuana, ^. 



33. Georgina, Recluz. 



34. granulata, Reeve. 



35. Grayana, Recluz. 



36. grisea, Reeve. 



37. grossa, Linnaeus. 



38. haustrum, Reeve. 



39. Helicinoides, iteewe. 



40. Hindsii, Recluz. 



41. histrio, Linnaeus. 



42. Le Guillo liana, 5ec^. 



43. lineata, Cliernnitz. 



44. Listeri, Recluz. 



45. Longii, e^. 



46. marmorata, Reeve. 



47. Maura, Recluz. 



48. maxima, Chemnitz. 



49. Neritinoides, Reeve. 



50. Neritopsoides, z'<#. 



51. nigerrima, Chemnitz. 



52. nivosa, Reeve. 



53. Novae-Guineas, Zesa. 



54. oleagina, Reeve. 



55. Orbignyana, Recluz. 



56. ornata, Sowerly. 



57. oryzarum, Recluz. 



58. patula, Recluz. 



59. pellis-serpentis, Reeve. 



60. peloronta, Linnaeus. 



61. picea, Recluz. 



62. plexa, Chemnitz. 



63. plicata, Linnaeus. 



64. polita, z'e?. 



65. prsecognita, C. 5. ^s. 



66. quadricolor, Gmelin. 



67. ringens, Reeve. 



68. Rumphii, Recluz. 



69. Savieana, i'c?. 



70. scalpta, Reeve. 



71. semirugosa, Recluz. 



72. Senegalensis, Gmelin. 



73. signata, Macleay. 



74. Spengleriana, Recluz. 



7 5 . squamulata, Ze Guillou. 



76. stella, Chemnitz. 



77. tessellata, Gmelin. 



78. versicolor, Lamarck. 



79. vexillum, Reeve. 



80. Yoldii, ifec/os. 



Nerita costata. PI. 16. Pig. 86. Shell, showing its solid, globose 

 growth, and toothed columella. 



Genus 4. NATICA, Adanson. 



Animal ; owz/, wry /«?ye #?£</ expanded, rounded at each end ; 

 mantle largely developed, enclosing a thick circular ridge, hold- 

 ing the shell. Head furnished with a long trunk and sur- 

 rounded by a tentacular veil, from which are exserted two 

 widely separated lanceolate tentacles. Hind lobe of the disk 

 carrying the operculum partially spread over the shell. 



Shell; globose or Neritoid, sometimes openly inflated; spire short, 

 very often scarcely exserted ; ivhorls few, forming a large um- 

 bilicus, which is sometimes filed tvith a dense callosity, some- 

 times with a columnar callosity entering spirally ; aperture 



