FISHES OF THE PHILIPPINE ISLANDS AND ADJACENT SEAS 459 



All warm seas. Numerous fossils, mostly flat dental plates, known 

 from the Cretaceous and Tertiary. Ovoviparous. The following 

 imperfectly described nominal species not seen since originally 

 described : 



HOLORHINUS RHOMBUS (Basilewsky) 



Myliobatis rhomius Basilewsky, Nouv. Mem. Soc. Nat. Moscou, vol. 10, p. 250, 

 1855 (type locality: Pekin). — Gabman, Mem. Mus. Comp. ZooL, vol. 36, 

 p. 434, 1913 (copied). — Fowler, Proc. 4th (1929) Pacific Sci. Congr., Java, 

 p. 506, 1930 (reference) ; Hong Kong Nat, vol. 1, p. 185, 1930 (compiled). 



Head truncate ; mouth transverse ; teeth tetragonal, smooth, broad, 

 in pavement. No dorsal ; tail long, filiform, rough with sharp tuber- 

 cles; pectorals fleshy, acutely and prominently pointed, form rhom- 

 boidal disk ; ventrals 2, fleshy, broad, end behind disk. Above brown, 

 white below. Disk width, 535 mm., length, 508 mm., tail, 458 mm. 

 (Basilewsky.) 



ANALYSIS OF SPECIES 



a^. Snout short, broad, rounded. 



&'. Dorsal origin more than 2 lengths of base behind ventral bases. 

 c\ Median upper teeth 4 to 6 times broad as long above ; brown. 



d}. Orbital horn longer ; snout little pointed aquila 



d'. Orbital horn shorter ; snout more pointed cervus 



c^ Median upper teeth 1% to 2% times broad as long. 



e\ Purple above hamlyni 



e^ Yellowish olive-brown above, with 26 to 28 large irregular light- 

 blue spots australis 



b^ Dorsal origin 1 base length behind ventral bases; yellowish olive above, 



with blue transverse bars on head and across disk tenuicaudatus 



a'. Snout elongate, pointed; dorsal origin 1% lengths of base behind ventral 

 bases ; light brown, young with many lighter or reddish spots, most distinct 

 posteriorly tobijei 



HOLORHINUS AQUILA (Linnaeus) 



Raja aquila Linnaeus, Syst. Nat., ed. 10, vol. 1, p. 232, 1758 (type locality: Medi- 

 terranean Sea) ; ed. 12, vol. 1, p. 396, 1766. 



Myliobatis aquila Gray, List fish British Museum, p. 128, 1851 (reference). — 

 GuiCHENOT, Notes ile Reunion, vol. 2, p. 32, 1863. — Regan, Ann. Natal Gov. 

 Mus., vol. 1, pt. 3, p. 242, 1908 (Bird Island, Natal).— Fowler, Proc. Acad. 

 Nat. Sci. Philadelphia, 1910, p. 475 (Bonaparte material). — Gilchrist and 

 Thompson, Ann. Durban Mus., vol. 1, pt. 3, p. 288, 1916 (reference). — 

 Barnard, Ann. South African Mus., vol. 21, pt. 1, p. 82, pi. 4, fig. 7, 1925 

 (Walfish and Table Bays, Indian Ocean). 



Myliohates aquila Saxtvage, Hist. Nat. Madagascar, Poiss., p. 510, 1891 (refer- 

 ence). 



Mylioiatis noctula Bonaparte, Icon. Fauna Ital., Pesci, vol. 3, pt. 2, fasc. 2, 

 descr., pi., fig., 1833 (type locality: Italy). 



Snout 1% to 2 in head ; mouth width 2% to 2% ; internarial 2% 

 to 31/3 ; preoral length 1% to 2 ; front ventral edge 1 to 1% ; dorsal 

 length 3 to 41^4; ventral width li/io to 1%. Disk length, 125 to 225 

 mm., width, 219-347 mm., tail, 292-408 mm. 



