184 
2754 Menetus opercularis Gld. 
See Planorbis. 
2755 Modiolus demissus Dillwyn. 
2756 .Parthenia quinquecincta Cpr. 
2757 Ischnochiton regularis 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 lLepidopleurus nexus Cpr. 
2761 lLepidopleurus Oldroydi Bartsch. 
2762 Liostraca varians Sby. 
2763 Liotia acuticostata Cpr. 
2764 Littorina grandis Midd. 
2765 Discinisca strigata Brod. 
2766 Donax leigata 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 mangeriz Mke. 
2769 EKulima 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’] Mus b. 68. 1909. 
This exhaustive contribution of 247 pages, and 3° pilates, 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 FP: achates. “Santa Barbara, Cal. *__Mazatlan. 
Genus Turbonilla Risso. 
2777 TT: Diegensis. San Diego. 
2778 TT: acra. Catalina Island. 
2779 T: Gabbiana. Monterey. 
2780 TT: Atpynota. 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 TT: asser. Redondo. 
2786 T: attrita. San Pedro. 
2787 TT: Lowei. San Pedro. 
2788 T: profundicola. La Jolla. 
2789 T: Galianoi. Cape San Lucas, Baja Cal. 
2790 T: humerosa. Catalina I. 
2791 TT: vexativa. San Pedro. 
