164 



103. pyramis, Reeve. 115. 



104. pyriforruis, Recluz. 116. 



105. rapulum, Reeve. 117. 



106. ravida, Souleyet. 118. 



107. Raynaudiana, Recluz. 119. 



108. Eecluziana, Desk. 120. 



109. rufa, Rom. 121. 



110. rufilabris, Reeve. 122. 



111. Sagraina, D'Orbigny.WS. 



112. Seba?, Souleyet. 124. 



113. semisulcata, Gray. 125. 



114. Simise, Chemnitz. 126. 



septentrionalis, Reck. 127 



solida, Rlainville. 128. 



spadicea, Gmelin. 129. 



Strangei, Reeve. 130, 



Succinioides, *g?. 131, 



suifusa, «W. 132, 



sulcata, Rom. 133, 



textilis, Reeve. 134, 



Traillii, w*. 135, 



triseriata, Say. 136, 



uber, Valenciennes. 137 

 umbilicata, Qwoy. 



unifasciata, Lamarck. 

 unimaculata, Reeve. 

 variabilis, Recluz. 

 Vavaosi, Le Guillou. 

 venustula, Philippi. 

 vestalis, id. 

 violacea, Sowerhy. 

 vitellus, Lamarck. 

 Zanzibarica, Recluz. 

 zebra, Lamarck. 

 Zelandica, Quoy. 



Figure. 



Natica Cumingiana. PI. 16. Pig. 84. Shell, showing its solid, polished, 

 sculptureless surface, and large, open umbilicus, with in-growing 

 callosity. 



Genus 5. SIGARETUS, Adanson. 



Animal ; oval-oblong, acuminated in front, rounded behind, fur- 

 nished at both ends with a capacious lobe which envelopes a 

 large portion of the shell; head very large, depressed, furnished 

 with two long conical tentacles ; operculum small, oblong, horny, 

 concealed within a fold of the posterior lobe. 



Shell; suborbicular , somewhat ear-shaped, globose or depressly 

 globose, striated, never umbilicated ; spire short, but little 

 raised ; aperture dilated, disjoined, lip simple. 



The soft parts of Sigaretus, though closely allied to Natica, are larger, 

 and they are furnished with more capacious lobes, both in front and 

 behind more largely enveloping the shell. In most of the Naticce the 

 animal is able to draw itself entirely within the shell and cover itself in 

 by a tight-fitting operculum, mostly calcareous. In Sigaretus the animal 

 is more bulky than can be contained in the shell, and the operculum is 

 merely rudimentary, a small, useless, horny appendage concealed within a 

 fold of the hind lobe. 



The shell is of a brownish-white, fawn, or sand colour, never highly 

 painted or marked with any pattern. The outer surface is striated and 

 mostly linearly grooved, the spire small, the aperture large and shining. 

 The Sigareti are not very numerous. They inhabit the western coast 



