460 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



A.N.S.P. Nos. 410^13. Italy. C. L. Bonaparte (No. 217). All females. Cotypes 

 of Myliohatis noctula. 



HOLORHINUS CERVUS (J. L. B. Smith) 



Myliohatis cermis J. L. B. Smith, Rec. Albany Mus., vol. 4, p. 169, fig. 1, 1935 

 ( type locality : Knysna ; Cape Agulhas ; Bushman River ; Port Alfred ; 

 Great Fish Point). 



Disk 1% times wide as long. Pectoral tips moderately pointed, 

 subfalcate. Snout not very blunt, rounded, with apical point. 

 Flanges on side of head, connecting rostrals with pectorals, very 

 narrow. Circular flap of iris projecting over most of pupil from 

 above. Males with small conical horn above orbit. Central series 

 of teeth 4 to 5 times wide as long. 



Skin smooth, no tubercles. 



Dorsal small, projects beyond hind edge of base, originates 3 to 

 3I/2 lengths of base behind posterior part to margin of ventral base, 

 1 to 1% lengths of base behind end of ventral. Males with 2 serrated 

 caudal spines, posterior longer, females with 1 or 2 spines. Caudal 

 11/2 to 2 times long as disk. 



Color uniform brown. 



Length of female up to 4 feet (1,220 mm.) across disk, male usually 

 much smaller. (J. L. B. Smith.) 



South Africa. Females differ from Holorhinus aquila in the shape 

 of the snout, somewhat more pointed in H. cervus^ and this the only 

 apparent difference in the female. Orbital horn of H. cervus very 

 slight. "Full specific distinction of cervus from aquila is perhaps of 

 doubtful validity, since the females of these species cannot easily be 

 distinguished one from another." 



Holorhinus cervus differs from the related H. toMjei in the wider 

 disk and in the more posterior insertion of the dorsal. 



HOLORHINUS HAMLYNI (Ogilby) 



Myliohatis hamlyni OcrLBT, Ann. Queensland Mus., No. 10, p. 40, 1911 (type lo- 

 cality: Moreton Bay, Queensland) ; Mem. Queensland Mus., vol. 5, p. 89, 1916 

 (Moreton Bay; note). — McCtjlloch and Whitley, Mem. Queensland Mus., 

 vol. 8, pt. 2, p. 130, 1925 (reference).— Fowleb, Proc. 4th (1929) Pacific 

 Sci. Congr., Java, p. 506, 1930 (compiled). 



Head length 2% in disk length from snout tip to hind angle of 

 vent. Snout 4% in disk length, tip broadly rounded; eye 2% in 

 snout length, 2% in firm interorbital, 41/10 in interocular; mouth 

 width li/o in snout length, upper jaw with 6 and lower 9 series of 

 dental plates, each of 7 teeth, as wide transverse median which 

 gradually increases in width from front and 3 small laterals directed 

 outward and backward and of equal size throughout; in upper jaw 

 with first median wide as and last 2^/^ times 3 lateral teeth; in 

 lower jaw first half wide as, third wide as, and last twice wide as 



