58. hiemalis, Courth. 



59. hirundanina, Quog. 



60. hordacea, Adams. 



61. hydatis, Linn. 



62. insculpta, Totten. 



63. involuta, Adams. 



64. lignaria, Linn. 



65. lineata. Wood. 



66. lineolata, Courth. 



67. lutea, Q«oy. 



68. mamillata, i7/*7. 



69. marmorata, Ad. 



70. media, i7«7. 



71. minor, Adams. 



72. monodonta, n't?. 



73. Natalensis, Krauss. 



74. naucum, Linn. 



75. nebulosa, Gould. 



76. nitida, Adams. 



77. nitidula, Zis^. 



78. nonseripta, ^A/. 



79. oblonga, id. 



80. obstructa, Gould. 



81. obtusa, Turton. 



82. occidentalis, ,4<7. 

 S3, occulta, Migh. 



84. olivacca, Ehreii. 



85. olivula, Adams. 



86. oryza, To^. 



87. ovoidea, Q«oy. 115. 



88. ovulata, Proc/*. 116. 



89. papyrus, Adams. 117. 



90. parvula, id. 118. 



91. pectinata, Mull. 119. 



92. pellucida, Brown. 120. 



93. pemphis, I7m7. 121. 



94. pertenuis, MigTi. 122. 



95. Philippii, Krohn. 123. 



96. physis, Linn. 124. 



97. plauospira, .^?. 125. 



98. polita, id. 126. 



99. pruinosa, Clark. 127. 



100. punctulata, Ad. 12S. 



101. punctata, id. 129. 



102. puncto-striata, lf/j/#. 130. 



103. pusilla, Pfeiff. 131. 



104. pyginsea, Adams. 132. 



105. pyramidata, id. 133. 



106. pyriformis, id. 134. 



107. quadripartita, y/sc. 135. 



108. Quoyii, Gray. 136. 



109. rostrata, Adams. 137. 



110. rotundata, id. 138. 



111. rufolabris, id. 139. 



112. Sarsii, PA& 140. 



113. scabra, Chemn. 141. 



114. Schrceteri, Phil. 142. 



scutulum, Loven. 

 simplex, Adams. 

 Sinensis, id. 

 solida, B'aiff. 

 soluta, Che i, ,11. 

 speciosa, Adam*. 

 striatella, id. 

 shigella, Love a. 

 subangulata, Mull. 

 succinea, Conrad. 

 succisa, Ehren. 

 teuella, Adams. 

 tenera, id. 

 tenuis, id. 

 thalassiarchi, Mart. 

 tortuosa, Ad. 

 triticea, Courth. 

 truncata, Ad. 

 truncatula, Brut/. 

 tmuida, Adams. 

 turrita, Mull. 

 umbibcata, Mont. 

 vestita, Phil. 

 vexillum, Chemn. 

 virescens, Sow. 

 viridis, Rang. 

 vitrsea, Adams. 

 volnta, Quog. 



Figures. 



Bulla physis. PL M. Fig. 3. Animal, showing the shell partially in- 

 vested by the lateral lobes proceeding from the very ample disc. 

 From the Voyage de l' Astrolabe. 



Bulla albocincta. PL 22. Fig. 123. Shell of a large tropical species 

 of richly banded inflated growth. 



Family 2. APLYSIANA. 



Shell ; horny or shelly, not convoluted, internal. 



In this family the branchiae or gills are contained within a cavity, and 

 the only development of shell proceeding from the animal, which is of 



