526 Memoir Sears Foundation for Marine Research 



in the eastern North Atlantic from Morocco, the Azores, and the Iberian peninsula 

 (including the Mediterranean) to northern Norway, Iceland, and the Skagerrak; in the 

 western Atlantic^* from Cuban waters; from Japan; from northern China; also from 

 South Africa (p. 526). The range of one of the species, C. monstrosa, includes the north- 

 eastern Atlantic northward from the Azores and Morocco and also South Africa, but 

 not the intervening belt. Thus its distribution parallels that of certain Sharks and 

 batoids. 



Species. Six described species fall in the genus Chimaera. The two known from the 

 North Atlantic, C. monstrosa of the eastern side and C. cubana from Cuban waters in the 

 west, differ one from the other in the courses followed by the mucous canals on the head, 

 in the height of the caudal fin relative to the second dorsal, and in other less obvious 

 characters (p. 527). C.jordani of Japan and C. pseudomonstrosa of northern China are 

 closely allied to C. monstrosa^ but according to published accounts they appear to be 

 separable from it by the differences given in the following Key.*' The Japanese C. phan- 

 tasma more closely resembles C. cubana.^^ C. owstoni, also from Japan, is marked off 

 from all other members of the genus by its relatively larger anal fin and by the absence 

 of a caudal filament. 



Key to Species 



I a. Tip of anal fin falling considerably short of rear end of base of second dorsal 

 (Fig. 118C). cubana Howell-Rivero 1936, p. 527. 



I b. Tip of anal fin extending at least as far as rear end of base of second dorsal (Fig. 

 1 1 8 F). 



2 a. Caudal fin not prolonged as a filament. owstoni Tanaka 1905.*^ 



Japan. 



2 b. Caudal fin prolonged beyond rayed portion as a narrow filament. 



3 a. Rayed portion of upper side of caudal nearly or quite as high as posterior 

 part of second dorsal above fleshy base. 



4 a. Anterior part of each anterior upper dental plate with 5—6 radial 

 ridges. 



5 a. Horny rays of anterior part of first dorsal fin about 66 "/o as 

 long as distance from tip of snout to external gill opening; 

 ground tint on sides of trunk silvery. 



monstrosa Linnaeus 1758. 

 Eastern North Atlantic from Morocco, the 

 Azores and Mediterranean to northern Nor- 

 way and Iceland, and the Skagerrak; also 

 South African waters.^" 



46. It is probable that all reports of Chimaera from the fishing banks off New England and Nova Scotia were actually 

 based on Hydrolagus affinis (p. 539). 



47. We have seen neither C.jordani nor C. pseudomonstrosa. 



48. We have at hand an excellent female of C.pkantasma. 



49. J. Coll. Sci. Tokyo, 20 (11), 1905: 10, pi. i, figs. 2, 3; Fish. Japan, j, 1911: 18, pi. 5, figs. 17, 18. 



50. This species has been credited repeatedly to the western North Atlantic also. But the Chimaera reported many 

 years ago from Cuba as C. monstrosa has recently been found to be a separate species, cubana Howell-Rivero 1936 



