1849.] Catalogue of Malayan Fishes. 1381 



not denticulated. The external part of the base forms a blunt protu- 

 berance, without or with a slight notch. Posterior dorsal fin placed 

 either immediately opposite the anal, or above the posterior extremity 

 of the latter. A distinct caudal groove above and beneath. Scales 

 minute, tricarinate. Oviduct of the embryo flocculent. 



Carcharias (Scoliodon) acutus, Ruppell. 



Carcharias acutus, Ruppell : Chondropt. 5, Tab. 18, Fig. 4. 



Carcharias (Scoliodon) acutus, M. u. H. 29. 



Carcharias (Scoliodon) acutus, Richardson: Rep. 1845, 194. 



Yu of the Malays. 



Head above, back, sides and fins lead-grey, or light bluish grey ; 

 beneath white. Iris light blue silvery, with a narrow silvery line bor- 

 dering the black linear pupil. 



Habit : — Sea of Pinang, Singapore, Malayan Peninsula. 

 Indian Ocean, Red Sea, Java, China Seas. 



Total length : 3 ft. 



The anterior dorsal fin is situated a little nearer the pectorals than 

 the ventrals ; the upper and posterior margin join in a narrow elongat- 

 ed point. The posterior dorsal commences opposite the posterior half 

 of the base of the anal ; both terminate in elongated points. The dis- 

 tance between the commencement of the ventrals and that of the ante- 

 rior dorsal equals the distance from the commencement of the ventrals 

 to that of the posterior dorsal fin. The fifth gill-opening is situated 

 above the commencement of the pectorals. The scales are minute 

 rounded, and with five, four or three keels. In young individuals the 

 odd central tooth is considerably smaller than the rest. Single indivi- 

 duals occur during all seasons in the Straits of Malacca. 



Sub Gen. Prionace,* Cantor. 



(Equivalent to Prionodon, Muller und Henle } 1841.) 

 Teeth of either upper jaw, or of both jaws, finely denticulated on 

 both sides, oblique or straight, trigonal, or with a small apex on a 

 broad base. In the upper jaw almost invariably an odd central tooth. 

 Oviduct of the embryo smooth, not flocculent. 



* Upiuu, saw, d/c7/, edge. — Substituted for Prionodon, pre-occupied by Prionodon, 

 Horsfield, 1823, (Mam.) The characters given are those of M. M. Muller and 

 Henle. 



