NORTHWEST COAST MARINE SHELRBEARING MOLLUSKS. 127 
PYRGISCUS ADUSTUS Dali and Bartsch, 1909. 
U. S. Nat. Mus., Bull. 68, p. 108, pi. 10, fig. 12. 
San Diego, California. 
Subgenus Mormula A. Adams, 1854. 
MORMULA LORDI E. A. Smith, 1880. 
Ann. Mag. Nat. Hist., ser. 5, vol. 6, p. 288 ; U. S. Nat. Mus., Bull. 68, pi. 11, 
fig. 4. 
Sitka, Alaska, to Puget Sound. 
MORMULA REGINA Dali and Bartsch, 1909. 
U. S. Nat. Mus., Bull. 68, p. 112, pi. 11, fig. 1. 
Santa Rosa Island to Catalina Island, California. 
MORMULA CATALINENSIS Dali and Bartsch, 1909. 
U. S. Nat. Mus., Bull. 68, p. 113, pi. 11, fig. 10. 
Catalina Island, California. 
MORMULA ESCHSCHOLTZI Dali and Bartsch, 1907. 
Proc. U. S. Nat. Mus., vol. 33, p. 513, pi. 45, fig. 10. 
Port Simpson to Vancouver Island, British Columbia. 
MORMULA TRIDENTATA Carpenter, 1865. 
Journ. de Conchyl., vol. 13, p. 147 ; U. S. Mus., Bull. 68, pi. 11, fig. 12. 
Monterey to San Diego, California. 
MORMULA AMBUSTA Dali and Bartsch, 1909. 
U. S. Nat. Mus., Bull. 68, p. 115, pi. 11, fig. 13. 
San Pedro to San Diego, California. 
MORMULA SANTOSANA Dali and Bartsch, 1909. 
U. S. Nat. Mus., Bull. 68, p. 117, pi. 11, fig. 7. 
San Diego ? Todos Santos Bay, Lower California. 
MORMULA PENTALOPHA Dali and Bartsch, 1903. 
Mem. Cal. Acad. Sci., vol. 3, p. 282, pi. 1, fig. 1. 
San Pedro to Todos Santos Bay, Lower California. 
MORMULA HETEROLOPHA Dali and Bartsch, 1909. 
U. S. Nat. Mus., Bull. 68, p. 118, pi. 11, fig. 9. 
San Diego, California, to San Hipolito Point, Lower California. 
MORMULA PERISCELIDA Dali and Bartsch, 1909. 
U. S. Nat. Mus., Bull. 68, p. 119, pi. 11, fig. 6. 
Santa Rosa Island, California. 
Subgenus Bartschella Iredale, 1917. 
BARTSCHELLA LAMINATA Carpenter, 1856. 
Ann. Mag. Nat. Hist., ser. 3, vol. 15, p. 396 ; U. S. Nat. Mus., Bull. 68, pi. 12', 
fig. 16. 
San Pedro, California, to Point Abreojos, Lower California. 
BARTSCHELLA ARATA Dali and Bartsch, 1909. 
U. S. Nat. Mus., Bull. 68, p. 125, pi. 12, fig. 12. 
Off Catalina Island, California. 
