184 



2754 Menetus opercularis Gld. 

 See Planorbis. 



2755 Modiolus demissus Dillwyn. 



2756 Parthenia quinquecincta Cpr. 



2757 Ischnochiton l'egularis Cpr. 



Shell 35 mm. long, half that in width, ends both semicircular; 

 valves sharply arched, marked with fine sculpturing; outside olive, 

 inside light blue. 



2758 Ischnochiton magdalensis Hds. 



2759 Ischnochiton Mertensii Midd. 



Shell oval, elevated, with angular dorsal ridges and straight 

 slope on sides; color from orange to dark red-brown, sometimes 

 blotched with white; valves richly sculptured; 30 mm. or more 

 long. Sitka to Monterey, Cal. 



2760 Lepidopleurus nexus Cpr. 



2761 Lepidopleurus Oldroydi Bartsch. 



2762 Liostraca varians Sby. 



2763 Liotia acuticostata Cpr. 



2764 Littorina grandis Midd. 



2765 Discinisca strigata Brod. 



2766 Donax laeigata Desh. 



Formerly well known as Donax Californicus — a name now 

 used for a very different shell. 



2767 Epitonium 



Formerly called Scalaria, later named Scala. The species 

 bellastriatum, borealis, crebriscostatum, hindsii, indianorum, etc., 

 may be looked for under either of the three generic names in the 

 literature extant. 



2768 Erato mangeria? Mke. 



2769 Eulima Randolphi Van. 



2770 Eulima solitaria C. B. Ad. 



2771 Gibbula optabilis Cpr. 



2772 Helicella ventricosa Drap. 



2773 Dall, W. H. and Paul Bartsch: 



A monograph of West American Pyramidellid mollusks. U S. 

 Nat'l Mus b. 68. 1909. 



This exhaustive contribution of 247 pages, and 30 plates, de- 

 scribes an immense number of mostly minute shells of our fauna. 

 We shall venture to give nothing more here than name and type 

 locality of the species credited to California. See Nos. 2774-2882. 

 Genus Pyramidella Lamarck 



2774 P: Mexicana. Scammon Lagoon, Baja Cal. 



2775 P: Mazatlanica. Cape Tepoca, Mexico. 



2776 P: achates. "Santa Barbara, Cal." — Mazatlan. 



Genus Turbonilla Risso. 



2777 T: Diegensis. San Diego. 



2778 T: acra. Catalina Island. 



2779 T: Gabbiana. Monterey. 



2780 T: .Epynota. Off San Martin I., Baja Cal. 



2781 T: Santarosana. Santa Rosa I. 



2782 T: Kelseyi. San Diego. 



2783 T: Raymondi. Catalina Isl. 



2784 T: Carpenteri. San Pedro. 



2785 T: asser. Redondo. 



2786 T: attrita. San Pedro. 



2787 T: Lowei. San Pedro. 



2788 T: profundicola. La Jolla. 



2789 T: Galianoi. Cape San Lucas, Baja Cal. 



2790 T: humerosa. Catalina I. 



2791 T: vexativa. San Pedro. 



