162 Miss H. Richardson on the Isopods of the 



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



p. 734. 

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



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

 Limnoria califurnica, Howston, 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 calif ornica, Hewston," are in the 

 National Museum, 



Family III. Cii'olanidce. 



Analytical Key to the Genera o/ Cirolanidae *. 



Pedimcle of second antennae five-jointed. Plate of 

 second joint of maxilliped.s furnished with hooks. 

 First and second pleopods alike, with at least inner 

 branch submembranaceoua. Uropoda with inner angle 

 of peduncle produced 3. Cirolana. 



Peduncle of second antennre four-jointed. Plate of 

 second joint of maxillipeds without hooks. Pleopoda 

 with both branches submembranaceous. Uropoda 

 with inner angle of peduncle verj^ 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. Eurydice. 



3. Cirolana, Leach. 



Analytical Key to the Species o/ Cirolana. 



Headwithont median process. P'irstpair 

 of anteunjie reach apex of peduncle of 

 second pair of antennae. Terminal 

 abdominal segment subtriangular, 

 armed on its posterior margin with 

 twenty-six spines. Both brandies of 

 the uropoda rounded posteriorly and 



armed with spines 4. C. Harfordi (Lockinp^ton). 



. 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 



fiosterior margin, and fringed with 

 ong hairs. Inner branch of the uro- 

 poda obliquely truncate posteriorly . . 5. C. Unguifrons^ sp. n. 



• The characters in this key on the Cirolanidse are taken from Stebbinff, 

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



