640 



REPORT 18G3. 



synonvmic name may be revived in restricted sense. STpecies=bia)2(/vJafa, 



P. Z. S. 18.15, p. 230. 

 r>9. Scntele decisa, Conr. auct. Large, rough, like Peruvian corrvfjaia, but truncated. 

 GO. Semele mpivm, Sby. Smaller, rough, swollen ; with smaller mantle-bend. 



Galapagos. Not r. Cp. 

 61. Semele nibrolineata. (? Conr.). Flattened, same shape, with faint sculpture eacli 



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



02. Semele ptdchra, Sby. Transverse, crowded concentric sculpture, with radiating 



lines at sides. Southern fauna, 



03. Semele mcongrua, n. s. Like ptdchra, with concentric sculpture differing in r, 



and 1. valves: fine radiating strias all over. 40-00 fm. c. C^a 



64. Cirminf/ia Californica, Conr. auct. JMaz. Cat. no. 44. 



65. Doiiax Californiciis, Conr. (non Desh.) = t<6cs«s, Gld. (non Desh.). Smooth, 



stumpy : outline and colour variable. 

 00. Donax Jiexiiosus, Gld. Like jJimctostriata jun. with stronger keel, and no 



punctures. 

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



68. Heterudonax himacidatus. Broad var., generally \\o\Bi, = Psanimohia Paeifica, 



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



Family Mactridce, 



69. Standella Californica, Conr. (non Desh.). I^arge, shaped like Schiz. Nuttalli, but 



beaks narrow. Mantle-bend separate from ventral line. 

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

 Californica and plannlaia, till more is known. 



70. Standella plamdata, Conr. Nearly as large ; shape approaching 3IactreUa exoleta. 



71. Statidella falcata, Gld. Otia. Shape like pkmidata, but flatter. 



72. Haeta tmdvlata, Gld. Otia. Like the Atlantic H. canalicidata, but reversed. 



Rare at S. Pedro, Cp. 



Family Veiteridce. 



73. ? dementia stihdiaphana, n, s. Hinge normal, very 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. 



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



jun. = stultor urn, Gray. 



76. Psephis tantilla, Gld. Otia. Subgenus of Venvs : animal ovoviviparous. Teeth 



elongate; approaching Pflc/iJ/f/eswia. SmaU, with purple spot. 12-20 fin, c. Cp. 



126 



