640 



REPORT 18G3. 



synonymic name may be revived in restricted sense. Sv)ecies=bian(julata ) 

 P. Z. S. 1855, p. 230. 



59. Semele decisa, Com*, auct. Large, rough, like Peruvian corntaata, but truncated. 



60. Semele rupium, Sby. Smaller, rough, swollen; with smaller mantle-bend. 



Galapagos. Not r. Cp. 



61. Semele rubrolineata, (? Conr.). Flattened, same shape, with faint sculpture each 



way, and pink rays. [Conrad's lost shell may be young decisa.^ 



62. Semele pulchra, Sby. Transverse, crowded concentric sculpture, with radiating 



lines at sides. Southern fauna. 



63. Semele incongma, n. s. Like pulchra, with concentric sculpture differing in r. 



and 1. valves : fine radiating striae all over. 40-69 fm. c. Cp. 



64. Cumingia Californica, Conr. auct. Maz. Cat. no. 44. 



65. Donax Calif ornicus, Conr. (non Desh.) = obesus, Gld. (non Desh.). Smooth, 



stumpy : outline and colour variable. 



66. Donax flexuosus, Gld. Like punctostriata jun. with stronger keel, and no 



punctures. 



67. Donax navicula, Sby. Maz. Cat. no. 77. From Southern fauna. 



68. Heterodonax bimaculatus. Broad var., generally violet, = Psammobia Pacifica, 



Conr.= Tellina vicina, C. B. Ad. Cape St. Lucas, Acapulco, W. Indies. 



Family Mactrida. 



69. Standella Californica, Conr. (non Desh.). Large, shaped like Schiz. Nuttalli, but 



beaks narrow. Mantle-bend separate from ventral line. 



696. Standella ? var. nasuta, Gld. (suppressed). Revived for young shells between 

 Californica and planulata, till more is known./ 



70. Standella planulata, Conr. Nearly as large ; shape approaching Mactrella exoleta. 



71. Standella falcata, Gld. Otia. Shape like planulata, but flatter. 



72. llaeta undulata, Gld. Otia. Like the Atlantic R. canaliculata, but reversed. 



Rare at S. Pedro, Cp. 



Family Veneridce. 



73. ? Clementia subdiaphana, n. s. Plinge normal, verv thin, ashy. 



74. Amiantis callosa, Conr. (not auct.). Subgenus of Callista: hinge-plate rough- 



ened as in Mercenaria : mantle-bend as in Dosinia. L. w. com. Cp. 

 76. Pachydesma crassatelloides, Conr. auct. Subgenus of Trigona, with fewer teeth : 



jun. = stultorum, Gray. 

 76. Pscphis tantilla, Gld. Otia. Subgenus of Vmus : animal ovoviviparous. Teeth 



elongate, approaching Pachydesma. Small, with purple spot. 12-20 fin. c. Cp, 



126 



