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 JEga microphthalma, may perhaps prove distinct, 

 in which case I would propose for them the name Cirolana 

 pubescens. 



.EGACYLLA LECONTII. Dana. 

 iEgacylla LeContii, Dana ; Proc. Acad. Nat. Sci. Philad. vii. 177. 



Hab. California, (Le Conte.) 

 Mas. of Prof. Dana. 



SPELEROMA OREGONENSIS. Dana. 



Sphaeroma Oregonensis, Dana ; U. S. Exploring Expedition, Crust, ii. 778. 

 PI. LII. f. 4. Proc. Acad. Nat. Sci. Philad. vii. 177. 



This little crustacean is very common on the coasts of 

 California 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 

 into a ball when disturbed. It was found in Puget Sound, 

 (Pickering;) Shoalwater Bay, (Cooper;) and in San Fran- 

 cisco Bay, (Expl. Exped.) 



Mus. Smithsonian ; Bost. Soc. ; Phil. Acad. ; Paris ; 

 Acad. Petrop. 



