222 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Eusphyra Mochii Whitley, Mem. Queensland Mus., vol. 10, pt. 4, p. 139, 1934 



(reference). 

 Squalus zygaena (not Linnaeus) Bloch, Naturg. auslJind. Fische, vol. 1, pi. 117, 



1785 (probably India).— Schneidee, Syst. Ichth. Bloch, p. 131, 1801 (Indian 



Ocean). 

 Zygaena platycephala Van Hasselt, Algemein Konst. Letterbode, May 1823, 



P- — (type locality: Java) ; Bull. Sci. Nat. F^russac, vol. 2, p. 90, 1824 



(Java). 

 Zygaena laticeps Cantor, Quart. Med. Journ. Calcutta, p. 315, pis. 1-3, 1837 



(young) (type locality: Calcutta). 

 Zygana laticeps Swainson, Nat. Hist. Animals, vol. 1, p. 134, fig. 11, 1838 



(head) ; vol. 2, p. 318, fig. 97, 1839 (dorsal view). 



Depth 5% to 5% to subcaudal origin; head 3i/^ to 4^4:7 2% to 3 in 

 its width. Snout length in profile 5% in head; eye about 7^^ to 

 10, 6 to nostril; mouth width 2 to 2i^ in head, length II/2 to 2 in its 

 width, no labial folds ; about 28 rows of upper teeth, 24 rows, broadly- 

 triangular, inclined, each with outer notch; nostrils much nearer 

 mouth than eyes, internarial 2% in head width; snout tip to mouth 

 subequal with oculonarial expansion and front edge or between nos- 

 trils broadly rounded as seen from above. Last 2 gill openings 

 over pectoral. 



First dorsal inserted over pectoral base posteriorly, front edge 

 Sy^ to 314 to subcaudal origin ; second dorsal length 1% to 2 in head, 

 origin opposite first third in anal base ; anal length 1% to 1% in head ; 

 least depth of caudal peduncle 314 to 3%; pectoral II/5 in head to 

 second gill opening with age, width lyg to 21/^ its length; ventral 

 1% to 2l^ in head to first gill opening; caudal 2 in rest of body, 

 subcaudal 2% to 2% in caudal. 



Dusky or gray brown above, below whitish. In young edges 

 above of oculonarial expansion, anal, caudal and paired fins all 

 narrowly paler. 



India, Ceylon, Pinang, Singapore, East Indies, Indochina, Queens- 

 land. 

 1 example. A.N.S.P. Pondicherry, India. June 9, 1840. Thomas Ryan. Dry 



skin, 1,284 mm. 

 1 example. A.N.S.P. Bombay. Dr. F. Hallberg. Length, 347 mm. 



Order Cyclospondyli 



Eyes without nictitating membranes. Gill openings before pectorals. 

 Spiracle present. Vertebrae with calcareous lamellae arranged in 

 a ring about central axis. Two dorsal fins, with or without spines. 

 No anal. Caudal bent upward, lower lobe little developed. Pectoral 

 normal, not expanded or deeply notclied. 



ANALYSIS OF FAMILIES 



a'. Each of 2 dorsals with spine; snout moderate to long Squalidae 



a'. Each of 2 dorsals spineless ; snout short , Dalatiidae 



