145 



2091 Helix (Arionta) Magdalenensis 



Type locality: — Magdalena, Son., Mexico (V. Bailey), among 

 rocks on top of a mountain 1000 ft. above the sea. 



2092 Holospira seittisculpta 



Type locality: — San Carlos, Chin., Mexico (T. W. Stanton). 



2093 Melania acutifilosa 



'"Shell slender, elongated; whorls rounded, convex; sutures 

 much impressed. Spire eroded above the 4th whorl. Surface 

 sculptured with strong thread-like revolving keels alternating 

 with broad channels; of these keels there are usually 6 on the 

 body whorl, sometimes more, and generally 3 only on the pre- 

 ceding whorls, of which the upper 2 are rather the most promi- 

 nent and are usually interrupted and regularly broken up, pro- 

 ducing an evenly crenulated chain. Following the wind of the 

 shell and just below the sutures, the whorls broadly slope to the 

 succeeding keel, which gives the shell a turrited outline. Sur- 

 face of shell a very dark horn color, blackish; aperture small, 

 ovate, inside lighter colored than the surface, the substance of 

 the shell being thin and partially translucent, the keels showing 

 through on the inside of the mouth, when held up to the light. 

 Dimensions of the largest: longitudinal 16.5, latitudinal 7.5 mm." 

 — Stearns, U. S. Natl Mus pr 13:211, t 15 f 9. 



Type locality: — Eagle Lake, Cal. (Henry W. Henshaw). 



2094 Mitra nodocancellata 



Type locality: — Gulf of Cal. (W. J. Fisher). 



2095 Venericardia barbarensis 



"Shell rounded, inequilateral, variable in outline, more or 

 less oblique, moderately convex. Beaks small, slightly elevated 

 and turned forward. Surface ornamented with 19-20 radiating 

 ribs usually somewhat granulose, and generally obscure on the 

 extreme anterior and posterior margins of the valves. Epidermis 

 a dingy yellowish brown, thicker towards the ventral margin and 

 sides of the valves; thin and commonly eroded at or towards the 

 umbos. Lunule small, slightly sunken, faintly denned. Hinge 

 line small, not thick; hinge composed of, in the left valve, a sin- 

 gle strong cardinal sloping posteriorly and a smaller tooth often 

 obscure, slanting anteriorly; a 3d tooth-like process is generally 

 present, situated under and apparently a projection of the edge 

 of the lunule. This latter varies much in prominence in different 

 specimens, and is often but barely perceptible. The hinge in the 

 right valve is characterized by a single strong cardinal tooth with 

 a slanting, somewhat sinuous groove above, and a slight notch 

 and tooth-like point below the upper part of the lunule; this latter 

 character is frequently inconspicuous and feeble. The valves are 

 rather thin and somewhat translucent, bluish white on the inside 

 and showing the ribs when held up to the light. Dimensions, from 

 umbones or beaks to opposite edge 15, from anterior to posterior 

 edges 15 mm, varying the fraction of a millimeter in either or 

 both of these dimensions in different individuals." — Stearns, U. S. 

 Nat. Mus pr 13:214, t 16 f 3, 4. 



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



2096 Venericardia borealis 



Stearns, 1. c, t 16 f 8, which see for range and synonymy. 



2097 Lucina requizonata 



"Shell moderately convex, dull white chalky where eroded; 



