ISOPODS OF NORTH AMERICA. 577 



Bureau of Fisheries steamer Albatross at Station 4236, vicinity of Yes 

 Bay, Behm Canal, and Station 4257, vicinity of Funter Bay, Lynn 

 Canal. Depth, 147 to 350 fathoms. 



The host is unknown. 



The type of the species is in the U. S. National Museum, Cat. No. 

 29250. 



Another specimen has been collected by the U. S. Bureau of Fish- 

 eries steamer Albatross from southern California. 



Family XXII. CRYPTONISCHXE. 



Body of female forming a sac filled with eggs, with sometimes only 

 slight traces of segmentation. No true legs present, all or most of the 

 appendages of the body lost. 



Male not different from female larva of the last larval stage and 

 does not pass beyond this stage. In the last larval stage the first pair 

 of antennae have two flagella and the basal article is expanded behind, 

 with the expansion generally pectinate. Epimera usually pectinate. 

 First two pairs of legs shorter and thicker than others. Both branches 

 of pleopoda well developed. Outer branch of uropoda generally much 

 shorter than inner branch. 



1OO. Genus CLYPEONISCUS Giard and Bonnier. & 



Body of adult female flattened, oval, without any traces of segmenta- 

 tion. Lateral parts lobular; anterior and posterior extremities incised. 

 Dorsal surface convex, with an opaque area in front of the middle. 

 Ventral surface flattened with a longitudinal slit leading to the inner 

 cavity, and having on either side a number of small valvular lamellae. 

 At the base of the posterior incision is a small projection. There is 

 no distinct apparatus for fixing the parasite. 



Male short and thick. Basal expansion of the first pair of antennas 

 broad and pectinate. Epimera distinctly pectinate. Second pair of 

 antennae short. Uropoda with the outer branch much smaller than 

 the inner. 



First larval stage having a broad operculiform plate covering the 

 ventral side of the terminal part of the body. Parasitic in the incu- 

 batory pouch of Isopods of the family Idotheidae. 



CLYPEONISCUS MEINERTI Giard and Bonnier. 



Clypeoniscus meinerti GIARD and BONNIER, Bull. Scientifique de la France et de la 

 Belgique (4), XXV, 1893, pp. 421-436, 444. 



Localities. Greenland (Godhavn); Nova Zembla (Jugor Schar) 

 (Giard and Bonnier). 

 Depth. 6 to 10 fathoms. 



a For characters of family see Sars, Crust, of Norway, II, 1899, pp. 231-232. 

 & For characters of genus, see Sars, Crust, of Norway, II, 1899, p. 239. 

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