536 Memoir Sears Foundation for Marine Research 



8 a. Caudal filament at least as long as distance from tip 

 of snout to origin of caudal fin; jugular mucous 

 canal meets oral canal some distance downward 

 from orbital canal. 



9a. First dorsal fin with apex extending consider- 

 ably beyond tip of spine, its anterior margin 

 considerably longer than distance from tip of 

 snout to external gill opening; second dorsal 

 about half as high at midlength as at anterior 

 end. deani (Smith and Radcliffe) 1912."' 



Philippines. 

 9 b. First dorsal fin with apex about level with tip 

 of spine, its anterior margin not longer than 

 distance from tip of snout to external gill open- 

 ing; second dorsal only Vs— Vs as high at mid- 

 length as at anterior end. 



mirabilis (Collett) 1904.'" 



Northeastern Atlantic, Faroe Bank 



and Channel, Irish slope. 



8 b. Caudal filament not longer than distance from tip of 



snout to external gill opening; jugular mucous canal 



and oral canal meet orbital canal separately. 



barbouri (Garman) 1908.'^ 

 Japan. 

 6 b. Second dorsal fin with upper margin straight or only weakly 

 concave, its height nearly or quite as great at midlength as 

 at anterior end. 



loa. Dorsal spine attached to anterior edge of 

 first dorsal fin nearly or quite to its tip, 

 without marginal thornlets, its posterior 

 side not grooved; apex of first dorsal 

 rounded. purpurescens Gilbert 1905.'^ 

 Off Hawaiian Islands, 

 lob. At least outer half of dorsal spine free 



69. Proc. U. S. nat. Mus., 42, 1912: 232; Chimaera deani. 



70. Forh. VidenskSelsk. Krist., 9, 1904: 5; Rep. Norweg. Fish. Invest., 2 (2), 1905: 35, pi. i, fig. 4; Holt and Byrne, 

 Fish. Ireland Sci. Invest. (1908), 4, 1910: 11, pi. 2; Koefoed, Rep. Sars N. Atlantic Deep Sea Exped. (1910), 4 (i), 

 1932: 29, fig. 3. 



71. Bull. Mus. comp. Zool. Harv., 57, 1908: 255; Chimaera barbouri. On the type specimen (Harv. Mus. Comp. Zool., 

 No. 1 281), the second dorsal fin is about half as high at the midlength as at the anterior end. But Tanaka (Fish. 

 Japan, i, 1911 : 17, pi. 4, fig. 1) describes and pictures another Japanese specimen as barbouri with the second dorsal 

 so deeply concave that the fin is nearly subdivided. 



72. Bull. U. S. Bur. Fish., 23 (2), 1905: 582, fig. 231. Garman (Mem. Harv. Mus. comp. Zool., 40, 1911: 90) considered 

 purpurescens Gilbert 1905 preoccupied by C. purpurascem Jordan and Snyder 1904 (Smithson. misc. Coll., 45, 235), 

 and hence he proposed the specific name gilberti to replace the former. But this change is not needed according to 

 the International Rules of Zoological Nomenclature (see Proc. biol. Soc. Wash., J9, Art. 35, 1929: 87). 



