162 Miss H. Richardson on the Isopods of the 



Liinnoria uncinata, Heller, Verb. k. k. zool.-bot. Ges. Wien, xvi. 1866, 



p. 734. 

 Limnoria lignorum, Harger, Report U.S. Commissioner of Fish and 



Fisheries, 1878, pt.iv.pp.373,376. (See Harger for further synonymy.) 

 Limnoria cahfornica, Hewston, Proc. Cal. Acad. Sci. v. 1874, p. 24 



(nomen nudum). 



Hah. Pacific Ocean ; Bering Island. Also found on east 

 coast of North America from Florida to Halifax, on the coast 

 of Great Britain, and in the North Sea. Specimens from 

 San Diego, California, collected by Mr. Henry Hemphill and 

 labelled " Limnoria californica, Hewston," are in the 

 Rational Museum, 



Family III. Cirolanidae. 



Analytical Key to the Genera o/ Cirolanidse *. 



«. Peduncle of second antennae five-jointed. Plate of 

 second joint of maxillipeds furnished with hooks. 

 First and second pleopods alike, with at least inner 

 branch submembranaceous, Uropoda with inner angle 

 of peduncle produced 3, Cirolana. 



tt' . Peduncle of second antennfe four-jointed. Plate of 

 second joint of maxillipeds without hooks. Pleopoda 

 with both branches submembranaceous. Uropoda 

 with inner angle of peduncle very little produced. 

 Superior antennae with fir.>t joint of peduncle quite 

 short, and extended straight in front at a right angle 

 to remaining part of the antenna 4. Enrydiee. 



3. Cirolana, Leach. 



Analytical Key to the Species o/" Cirolana. 



e. Head without median process. P'irst pair 



of antennae reach apex of peduncle of 



second pair of antennae. Terminal 



abdominal segment subtriangular, 



armed on its posterior margin with 



twenty-six spiues. Both branches of 



the uropoda rounded posteriorly and 



armed with spines 4. C. Harfordi (Lockington). 



a'. Head with long, straight, median pro- 

 jection. First pair of antennae reach 



the posterior margin of the third tho^ 



racic segment. Terminal abdominal 



segment rounded and crenulate on its 



posterior margin, and fringed with 



long hairs. Inner branch of the uro- 

 poda obliquely truncate posteriorly . . 5. C. linguifronsy sp. n. 



* The characters in this key on the Cirolanidae are taken from Stebbing, 

 'History of Crustacea ' (1893), p, 342. 



