of the Pacific Shores of North America. 509 
a short pubescence. Head and first three thoracic segments 
sculptured with impressed lines parallel to the margin. All 
the thoracic segments except the first are provided with 
large sculptured epimera; those of the first two pairs 
smaller in size, with two submarginal impressed lines ; 
those of the posterior five pairs projecting beyond their seg- 
ments, and marked with a diagonal median line as well as 
one parallel to the lower margin. 
The specimens to which the above description applies 
approximate somewhat, in the character of the anterior tho- 
racic feet, to the genus Cirolana, and, although probably only 
a variety of Æga microphthalma, may perhaps prove distinct, 
in which case I would propose for them the name Cirolana 
pubescens, 
JEGACYLLA LECONTII. Dana. 
JEgacylla LeContii, Dana; Proc. Acad. Nat. Sci. Philad. vii. 177. 
Hab. California, (Le Conte.) 
Mus. of Prof. Dana. 
SPHEROMA OREGONENSIS. Dana. 
Spheroma Oregonensis, Dana; U. S. Exploring Expedition, Crust. ii. 778. 
Pl LIL. f.4. Proc. Acad. Nat. Sci. Philad. vii. 177. 
This little crustacean is very common on the coasts of 
alifornia and Oregon, and congregates in large numbers 
Under stones near low-water mark in sheltered situations. 
It looks very much like an Oniscus, or pill-bug, rolling itself 
mio a ball when disturbed. It was found in Puget Sound, 
(Pickering ;) Shoalwater Bay, (Cooper;) and in San Fran- 
“seo Bay, (Expl. Exped.) 
Mus. Smithsonian; Bost. Soc.; Phil. Acad.; Paris; 
Acad, Petrop. 
