640 



REPOKT 18G3. 



synonyTnic name may be revived in restricted sense. S^ecies=bian.ffvlata, 



P. Z. S. 185.5, p. 230. 

 69. Semele decisa, Conr. auct. Large, roiigli, like Peruvian corrvgata, but truncated. 

 GO. Semele rupium, Sby. Smaller, rough, swollen; with smaller mantle-hend. 



Galapagos. Not r. Cp. 



61. Semele rwbrolineata, (? Conr.). Flattened, same shape, with faint sculptm-e eacb 



way, and pinli rays. [Conrad's lost shell may be young decisa.'] 



62. Semele pulchra, Sby. Transverse, crowded concentric sculptiu-e, with radiating 



lines at sides. Southern fauna. 



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



and 1. valves: fine radiating striaB all over. 40-60 foi. c. Cp. 



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



65. Lonax Calif ornicus, Conr. (non Desh.) = o6esMS, Gld. (non Desh.). Smooth, 



stumpy : outline and colour variable. 



66. Donax flexuosus, Gld. Like pimctostriata jun. vdth stronger keel, and no 



punctures. 



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



G8. Hetei-udonax himaculatus. Broad var., generally violet, = Psammo5M Pacifica, 

 Oom',= Tellina viciiia, C. B. Ad. Cape St. Lucas, Acapulco, W. Indies. 



Family Mactridce. 



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



beaks narrow. Mantle-bend separate from ventral line. 

 69 5. 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 Jfffefo-c??a ea-ofeia, 



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



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



Rare at S. Pedro, Cp. 



Family Veneridce. 



73. ? dementia subdiaphana, n. s. Hinge normal, very thin, ashy. 



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



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



75. Pachydesma crassateUoides, Conr. auct. Subgenus of Trigcma, with fewer teeth : 



jun.= stoKorwm, Gray. 



76. Psephis tantilla, Gld. Otia. Subgenus of Venus : animal ovoviviparoua. Teetli 



elongate, approaching Pac/fyrfes/^a. Small,with purple spot. 12-20fm. c. Cp. 



126 



