58 



103. parvus, Sow. 126. 



104. Patagonicus, King. 127. 



105. pes-anatis, Reeve. 128. 



106. pes-felis, Lin. 129. 



107. pica, Reeve. 130. 



108. pictus, Sow. 131. 



109. pleuronectes, Lin. 132. 



110. plica, id. 133. 



111. proteus, Solander. 134. 



112. prunum, iteeytf. 135. 



113. pseudamusium, Klein .136. 



114. pseudo-lima, Sow. 137. 



115. pulchella, Reeve. 138. 



116. purpuratus, Lam. 139. 



117. pusio, ////. 140. 



118. pyxidatus, Rom. 141. 



119. radula, Z?«. 142. 



120. Eeevei, Adams. 143. 



121. reticulatus, Reeve. 111. 



122. roseo-punctatus, «W. 145. 



123. rabidus, Hinds. 146. 



124. rufiradiatus, Reeve. 147. 



125. rugosus, £o?0. 148. 



russatus, Reeve. • 149. 

 sangiiinolentus,6r;??eZ. 150. 



saniosus, Reeve. 

 senatorius, Gmel. 

 sentio, Reeve. 

 sericeus, Hinds. 

 serratus, >SW. 

 Sinensis, ?c?. 

 Singaporinus, id. 

 solans, Rom. 

 solidulus, Reeve. 

 Sowerbyi, id. 

 speciosus, id. 

 spectabilis, id. 

 spectrum, id. 

 spiniferus, Sow. 

 splendidulus, id. 

 squamatus, Gmel. 

 squamosus, id. 

 stellatus, Reeve. 

 Strangei, id. 

 subnosus, Sow. 

 subplicatus, id. 



151. 



152. 

 153. 

 154. 

 155. 

 156. 

 157. 

 158. 

 159. 

 160. 

 161. 

 162. 

 163. 

 164. 

 165. 

 166. 

 167. 

 168. 

 169. 

 170. 

 171. 



subrufus, Turton. 

 sugillatus, Reeve. 

 sulcatus, Rom. 

 superbus. Sow. 

 tegula, Wood. 

 tenellus, Reeve. 

 tenuigranosus, id. 

 testudineus, id. 

 textilis, id. 

 tigrinus, Mull. 

 tigris, Lam. 

 tinctus, Reeve. 

 Tranquebaricus, Gmel. 

 triradiatus, Reeve. 

 undulatus, Sow. 

 unicolor, Lam. 

 ustidatus, Reeve. 

 varius, Lin. 

 vclntinus, Sow. 

 ventricosus, id. 

 vestalis, Reeve. 

 vexillum, id. 

 ziczac, Lin. 



Figure. 



Pecten bifrons. PL 27. Fig. 1G2. Shell, of an exotic species, showing 

 its auriculated hinge and symmetrically rayed growth. 



Genus 5. HEMIPECTEN, Adams and Reeve. 



Animal ; unknown. 



Shell ; orbicular, very thin, hyaline, concentrically lineated ; loioer 

 valve flat, auriculated posteriorly, with a deep byssal sinus, hav- 

 ing the opposite margin finely denticled ; upper valve convex, 

 scarcely auriculated ; hinge toothless, with a marginal ligament, 

 and a small central internal ligament in a somewhat superficial 

 pit. 



During the cruise of the 'Samarang' among the islands of the Eastern Ar- 

 chipelagoes in 1843-6, under the command of Capt. Sir Edward Belcher, 

 two semitransparent hyaline shells, about an inch and a quarter in dia- 

 meter, were dredged off the Island of Sooloo, partaking curiously of the 



