386 
ZOOLOGY, 
Family ANATINID^. 
MYTILIMERIA NUTTALLI. 
Mytilimeria nuUalli, Cone. Journ. Acad. Pliila. VII, p. 247. pi. 19, f, 5. — Cakp. Rep. p. 301. 
Hah.- -San Diego; Lieutenant W. P. Trowbridge. 
A small group of this curious shell, nestling in a white friable arenaceous substance, was 
received by the Smithsonian Institution through the kindness of Lieutenant Trowbridge. 
Family PHOLADIDAE. 
PHOLAS PENITA. 
Pholas peniia, Conr. Jour. Acad. Phila. VII, p. 237, pi. 18, f. 7, 1837. 
Pholus cmcamerata, Desuatks, Eev. Zool. p. 234, 1839. — Idem, Mag. de Zool. pi. 17, 1840. 
Parapholas pmita, Conr. Jour. Acad. Phila. 1849, p. 214, Carp. Rep. p. 290. 
Hah. — Shoalwater bay. Dr. Cooper ; Straits of Fuca, Dr. Suckley ; Oregon, mouth of Umpqua river. Dr. VoUum, TJ. S. A. 
"A specimen was obtained from a piece of worn rock which drifted into the bay attached 
to the roots of macrocysHs, the giant seaweed." — C. 
