386 
ZOOLOGY. 
Family ANATINIDJE- 
MYTILIMERIA NUTTALLI. 
Mytilimeria nuttalli, Conr. Journ. Acad Phila. Vil, p. 247, pi. 19, f. 5.— Carp. Rep. p. 301. 
Bab. —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 P HOLADIDAE* 
PHOLAS PENITA. 
Pholas penita, Conr. Jour. Acad. Phila. VII, p. 237, pi. 18, f. 7,1837. 
Pkolus concamerata, Deshayes, Rev. Zool. p. 234, 1839.— Idem, Mag. de Zool. pi. 17, 1840. 
Parapholaspenita, Conr. Jour. Acad. Phila. 1849, p. 214.— Carp. Rep. p. 290. 
Bab. —Shoalwater bay, Dr. Cooper; Straits of Fuca, Dr. Suckley; Oregon, mouth of Umpqua river, Dr. Yollum, U. S. A. 
“A specimen was obtained from a piece of worn rock which drifted into the bay attached to 
the roots of macrocystis, the giant sea-weed.”—C. 
