TOEPEDINIDjE. 45 



1. Genus NARCINE, Henle. 



Disk distinct from the tail, which has a lateral fold on each side 

 and is longer than the disk. Spiracles close behind the eyes : 

 nasal valves confluent, forming a quadrangular flap. Teeth nearly 

 flat, with a central point. Two dorsal fins, the anterior behind 

 the ventrals and usually smaller than the posterior. An electric 

 apparatus present. 



It must be noted that an apparatus exists in fishes of the genus 

 Raia which presents the anatomical characters of electric organs, 

 and has been known for a long period. 



Geographical Distribution. Tropical and subtropical seas. 



48. (1.) Narcine timlei. (Fig. 18.) 



Kaja timlei, Bl. Schn. Syst. Ich. p. 359. 



Narcine timlei, Day, Fish. India, p. 733, pi. cxcii, fig. 3 (see synou.). 

 Temeree and Nalla Temeree, Tel. 



Outline of disk somewhat rounded, broader than long ; along the 

 side of the tail is a broad skinny keel reaching the base of the 

 caudal fin. Caudal portion of fish rather longer than the body. 

 Nasal valves confluent, forming a quadrangular skinny flap which 

 is rather elongated in the middle. Spiracle just behind the orbit 

 and not tuberculated on the edge. Teeth flattened anteriorly, 

 the internal ones with a small median cusp ; the dental plate only 

 embraces the central half of each jaw, the lips being thickened and 

 continuous at the angles. The*form of the dental plate varies, 

 being either angular in the mandible, the angle pointing downward 



& 



Fig. \9>.Xarcine timlei. 



or similar to what obtains in the upper ja\v. F'uis the first dorsal 

 usually commences just behind the ventrals, but occasionally over 

 their posterior extremity, it is somewhat smaller than the second ; 

 in the young its apex forms an angle, which in the adult becomes 

 rounded. The distance between the two dorsals equals that 

 between the posterior dorsal and the caudal. The size and shape 

 of the two dorsals is similar. Caudal with its hinder edge rounded 



