1871.] F. Day — Monograph of Indian Cyprinidce 279 



Genus. Semiplotus, Bleeker. PI. xxi, fig. 1. 



Abdomen rounded : mouth wide, transverse, slightly curved, inferior, 

 with a knob at the symphysis. Snout thick and prominent. Inter- 

 maxillaries more or less adherent to the maxilla, and but slight powers 

 of motion exist in the upper jaw. No barbels. Pharyngeal teeth (in 

 S. modestus) 4, 3, 2/2, 3, 4. Dorsal fin long, its last undivided ray 

 being strong, osseous, and either serrated or entire. Anal rather short. 

 Scales large. Lateral line passing to the centre of the base of the cau- 

 dal fin. 



Geographical distribution* Assam and Hill ranges on the Tenas- 

 serim coast. 



Synopsis of species. 



A. Serrated dorsal ray. 



1. Semiplotus modestus, D. 4/20 j A. 3/6 j L. 1. 32 — 34. Last undivided 

 dorsal ray osseous and serrated. Ahyab. 



B. Smooth dorsal ray. 



2. Semiplotus M'Clellandi, D. 3/25 ; A. 2/7 ; L. 1. 27. Last undivided dor- 

 sal ray osseous and entire ; silvery. Assam. 



A. Serrated dorsal ray. 

 1. Semiplotus modestus. PI. xxi, fig. 1. 



Day, Proc. Zool. Soc, 1870, p. 101. 



B. III. D. 4/20 ; P. 15 ; Y. 9 ; A. 3/6 ; C. 19 ; L 1. 32—34 ; 

 L. tr. 7J/7*. 



Length of head 2/9 : of caudal 2/9 : height of body nearly 1/3 

 of the total length. 



Eyes. Diameter 1/3 of length of head : 1 diameter from end 

 of snout : 1£ diameters apart. 



Snout broad, obtuse, with several open pores on either side. 

 Mouth inferior, transverse : no horny substance on the jaws, 

 mandible not covered by the lip, a knob at the symphysis. 

 Slight motion between the maxillary and intermaxillary bones. 

 The posterior extremity of the maxilla extends to beneath the 

 middle of the orbit. Barbels absent. 



Teeth, pharyngeal, 4, 3, 2/2, 3, 4, 



Fins.— Dorsal fin commences anterior to the origin of the ventral 

 and extends to above the anal, its last undivided ray is osseous and 

 serrated. 



