24 



THE NAUTILUS. 



Strombina solid iila Reeve. 



Strombus gracilior Sowerby. 



Strombus graiuilatus Wood. 



Cypraea annettae Dall. 



Trivia radians Lamarck. 



Cerithium gemmatum Hinds. 



Turritella nodulosa King. 



Neverita recluziana Deahayes, 

 small variety. 



Polinices uber Valenciennes. 



Crepidula excavata Broderip. 



Crucibulum imbricatiim Sow- 

 erby. 



Crucibulum spiuosum Sow- 

 erby. 



Fissurella volcano Reeve. 



Fissuridea murina Carpenter. 



Astraea undosa Wood. 



Ostrea veatchi Gabb. 

 Pecten circularis Sowerby. 

 Cardium biangulatum Sow- 

 erby. 

 Cardium procerum Sowerby. 

 Metis alta Conrad. 

 Tagelus violaceus Carpenter. 



Parvilucina approximataDall. 



Phacoides lampms Dall. 



Phacoides lingualis Carpenter. 



Diplodonta (Felaniella) seri- 

 cata Reeve. 



Diplodonta orbella Gould. 



Divaricella ebumea Reeve. 



Aligena cerittensis Arnold. 



Dosinia ponderosa Gray. 



Macrocallista squalida Sow- 

 erby. 



Macrocallista orcutti n. sp. 



Chione succincta Valenci- 

 ennes. 



Chione undateUa Sowerby. 



Anomalocardia rugosa Sow- 

 erby. 



Cyathodonta undulata Con- 

 rad. 



Cryptomya califomica Con- 

 rad. 



Schizothaerus nuttallii Con- 

 rad, var. capax Gould. 



Panope generosa var. taeniata 

 n. var. 



Macrocallista orcutti n. sp. 

 Shell ovate-triangular, convex, inequilateral, solid and very 

 heavy, six inches long, the beaks two and one-half inches be- 

 hind the anterior end, incurved, prosocoelous, ha\'ing neither 

 lunule nor escutcheon ; the surface smooth except for slight 

 incremental undulations, irregular, but stronger toward the 

 ends and near the base, where they are sometimes supple- 

 mented by fine striations; anterior slope more abrupt than 

 the posterior, both ends rounded, the posterior moderately 

 attenuated, the base roundly arcuate ; hinge of the type of 

 that of M. squalid^, but more concentrated, the posterior car- 



