146 



epidermis of a dull dingy light yellowish tinge, finely wrinkled in 

 old specimens, and inclined to be deciduous and slightly flaky or 

 ragged; in young shells, translucent, shiny, and nearly colorless. 

 Valves transversely ovate, being broader than high; the posterior 

 side is abruptly squarish, and the dorsal line slants gradually 

 from the umbones; on the anterior side the dorsal outline is mod- 

 erately concavely curved away from the beaks, and in young and 

 perfect specimens a very slight angulated pinch may be seen ex- 

 tending from the lunule to the anterior edge of the valves. The 

 beaks or umbones are small, inclined toward the lunule; the 

 lunule is quite narrow, alternately lanceolate and elongatea. 

 Surface of valves transversed with fine concentric growth lines, 

 and prominent rather regularly spaced thread-like ridges. Hinge 

 line curved and showing 2 diverging cardinal teeth in each valve; 

 the anterior one in the left valve, and the posterior one in the 

 right valve, notched or partially cloven. Elongated, tuberculoid 

 lateral teeth in both valves at extreme limit of dorsal or hinge 

 line. Dimensions: from beaks to ventral margin 37.5, from an- 

 terior to posterior edges of valves 46.25 mm. Individuals other- 

 wise of same dimensions vary much in rotundity; two examples 

 measure, 21.75 and 17.75 mm. diameter or thickness." — Stearns, 

 U. S. Natl Mus pr 13:220 t 17 f 3, 4. 



Type locality:— off Santa Barbara Islands, Cal., in 276 fms. 



2098 Periploma planiuscula Sby. 



Synonymy: — Periploma argentaria Conr., which see. — P: 



lenticularis Sby. — P: alta C. B. Ad. — P: excurva and excurvata 

 Cpr. 



2099 Stearns, R. E. C. 



Report on the mollusk-fauna of the Galapagos Islands with de- 

 scriptions of new species. U. S. Nat. Mus. pr. 16:353-450 t 51-2. 



On rare or little known mollusks from the west coast of North 

 and South America, with descriptions of new species. 1. c. 341- 

 352, t 50. 



Mentions Nos. 2100-2106. 



2101 Onchidella Binneyi 



Erroneously referred to O: Carpenteri. Gulf of Cal. (W. J. 

 Fisher). 



Stearns, U S Natl Mus pr 16:342 t 20 f 1-2. 



2102 Fusus ? polygonoides Lamarck. 

 Catalina Island, Cal. (W. J. Fisher). 



2103 Murex palnia-rosae Mexicana 

 Gulf of California.. 



2104 Ocinebra lugubris 



Synonymy (fide Stearns): — Murex lugubris Sby. — M: erin- 

 aceoides Val.- — M: californicus Hds. — M: californicus Reeve. 

 La Paz, Baja California, etc. 



2105 Purpura hippocastanuni L. 



Mulege bay, Baja Cal. — Viti, Samson and Pelew Isl. 



2106 Ranella cruentata Sby. 



Near Cape San Lucas, Baja Cal. — Utilla Isl., Honduras (C. T. 

 Simpson). — Viti Islands. 



2107 Stearns, R. E. C. 



Notes on recent collections of North American land, fresh- 

 water, and marine shells, received from the U. S. Department of 

 Agriculture. U. S. Natl Mus pr 16:743-755. Mentions Nos. 2108- 

 2109, from Ft. Huachuca, Arizona. 



