MARINE SHELLS OF LOWER CALIFORNIA. 4I 



50. Latirus gracilis Reeve, 2, beach-worn examples. 



51. L,KFiBOPL,K\jiLUs{pvohah\y I., pech'nu/ahis Carp.) i. 



52. LiTTORiNA ASPERA Philippi. Abundant; several 



varieties. 



53. Malea ringens Swainson. 20, eaten by natives. 



54. Melampus olivaceus Carpenter. 2, beach shells. 



55. Melongena ( Solenosteira) modificata Reeve. 



6. This much discussed shell seems to belong 

 chiefly to this region. 



56. MiTRA MAURA Swainson. i, a wide-spread species. 



57. MiTRA TRiSTis Sowcrby. i, a finely colored exam- 



ple. 



58. Modulus cerodes A. Adams. Half -pint of good 



specimens. 



59. MuRiciDEA DUBiA Sowerby. 8, chiefly beach shells. 



60. MuREX BicoLOR Valcnciennes. 5, perhaps brassica 



lamarck. 



61. MuREX PLicATUS Sowcrby. 4, in good condition. 



62. MuREX RADIX Gmelin. 4. This and bicolor are 



eaten. 



63. Nassa tegula Reeve. 2, more common northward. 



64. Nassa versicolor C. B. Adams. 70, also Mazat- 



lan (Reigen). 



65. Natica bifasciata Recluz. 45, common beach 



shells. 



66. Natica glauca Humboldt. 2, also Mazatlan 



(Reigen). 



67. Natica maro.chiensis Gmelin. i, at La Paz only. 



68. Natica uber Valenciennes. 13, common beach 



shells. 



69. Nerita bernhardi Gmelin. 25, common at low 



water. 



70. Nerita scabricosta Lamarck. 50, common at 



low water. 



