Fishes of the Western North Atlantic 179 



Carpet or Zebra Sharks), or are ornamented with fleshy flaps on the head. The majority 

 are small, but a few grow to a considerable size. Their diet is chiefly bottom dwelling in- 

 vertebrates and fishes. 



Key to Genera 



la. Sides of head fringed with fleshy lobes. 



2a. A continuous series of branching dermal lobes around lower jaw close to mouth. 



Eucrossorhinus Regan, 1908. 

 East Indies. 

 2b. No dermal lobes on lower jaw, or at most only a few small ones below chin. 



3a. Back smooth, without papillae or tubercles. Or^c/o/o^«j Bonaparte, 1834. 



Eastern Pacific, Australia. 



3b. Back with rows of papillae or tubercles. 5w/or^f/«j Whitley, 1940. 



Australia. 



lb. Sides of head without fleshy lobes. 



4a. Second dorsal originating posterior to origin of anal. 

 5a. Throat with a pair of thread-like barbels. 



Cirrhoscyllium Smith and Radcliffe, 19 13. 



China Sea.' 



5b. Throat without barbels. Parascyllium G\\\j i^Gl. 



Australia, Tasmania. 



4b. Second dorsal originating anterior to origin of anal. 

 6a. Spiracle minute. 



7a. Teeth with central cusp largest and several rows functional. 



Ginglymostoma Miiller and Henle, 1837, p. 180. 

 7b. Teeth with all cusps about equal, only i or 2 rows functional. 



A^^^mw Riippell, 1835. 



Australasia, Malay Peninsula, 

 Indian Ocean, Red Sea.* 



6b. Spiracle nearly or quite as large as eye. 



8a. Caudal more than Ys of total length j ist dorsal originating in front of 

 pelvics and terminating over latter. 



Stegostoma Miiller and Henle, 1837. 



Western Pacific, Australasia, Indian Ocean. 



3. Whitley (Rec. Aust. Mus., 15, 1927: 289) proposes to substitute a new name, Zev, on the ground that Cirrho- 

 scyllium Smith and Radcliffe, 191 3, was preoccupied by Cirriscyll'tum Ogilby, 1908, which in turn is a synonym 

 of Brachaelurus Ogilby, 1907, as pointed out below (footnote 5, p. 180). According to the International Rules 

 on Zoological Nomenclature, however, this substitution is not required; see recommendation under Article 36 

 (Proc. bid. Soc. Wash., 39, 1926: 87). 



4. Garman's (Mem. Harv. Mus. comp. Zool., 56, 191 3: 56) substitution of Nebrodes for Nebrius Riippell, because 

 of the earlier use of Nebria by Latreille (1802) for insects and of Nebris by Cuvier and Valenciennes (1830) 

 for bony fishes, was not necessary, according to the recommendations under Article 36, International Code of 

 Zoological Nomenclature (Proc. biol. Soc. Wash., jp, 1926: 87). 



