536 Memoir Sears Foundation for Marine Research 



Species. Recent estimates of the number of species actually represented by the named 

 representatives of this curious genus range from only one" to eight or nine," a list to 

 which two more have subsequently been added." Our own examination of specimens from 

 widely separated seas" has convinced us that the latter opinion is more nearly correct., i.e., 

 that most of the supposed species are separable from one another by characters that seem 

 precise enough to be accepted as specific, although they all resemble one another so closely 

 in general apearance that identification requires close inspection. The conformation of the 

 nasal margins and barbels (Fig. 103) proves a reliable diagnostic character, but the degree 

 to which the mid-dorsal line of denticles is enlarged is far less so, since this may vary widely 

 with age. 



Key to Species 



I a. Inner nasal barbel strongly ramose at tip 5 margin of nostril between barbels deeply 

 fringed (Fig. 103 A, B). 



2a. Outer nasal lobe strongly fringed. oculata Bonaparte, 1 840. 



Eastern Atlantic, Mediterra- 



nean. 



2b. Outer nasal lobe smooth or only weakly fringed (Fig. 103 A, B). 



3a. Outer corner of pectoral little if any more obtuse than a right angle, its inner 

 corner subangular j upper surface with small white and gray spots only. 



australis^^ Regan, 1906. 



Southern Australia, Tasmania. 



3b. Outer corner of pectoral much more obtuse than a right angle, its inner corner 



broadly rounded} upper surface with conspicuous brown ocelli as well as 



small spots. tergocellata^'' McCuUoch, 19 14. 



Western and southern Australia. 

 lb. Inner nasal barbel simple, or at least not strongly ramose j margin of nostril between 

 barbels smooth, or at most feebly fringed (Fig. 103 C-H). 

 4a. Fold along front of head with 2 lobes opposite and in front of corner of mouth. 



nebulosa Regan, 1906. 



Japan.^° 

 4b. Fold in front of head with i lobe only, or none. 



5a. Fold along front of head expanded as a noticeable triangular lobe outside 

 corner of mouth (Fig. 103 C). squatina Linnaeus, 1758. 



Eastern North Atlantic; Medi- 

 terranean. 



14. Ribeiro, Fauna brasil. Peixes, 2 (i) Fasc. i, 1923: 27. 



15. Regan, Ann. Natal Mus., r, 1908 : 2+8; Garman, Mem. Harv. Mus. comp. Zool., 36, 1913 : 251. 



16. Tergocellata from Australia (McCulloch, Biol. Res. "Endeavor," 2, 1914: 84) and argentina from Argentina 

 (Marini, Pliysis B. Aires, ,0, 1930: 0. 



17. From off the east coast of United States; Mediterranean; coast of northwestern Europe; Uruguay; S. Peruj 

 California; Japan; Australia. 



18. We question whether tergocellata is actually distinct from australis. 



19. This form is known only from the original description (without illustration) of the type specimen; it may prove 

 identical with jafonica. 



