302 THE PLAGIOSTOMIA. 



Disk a broad ovate, narrowed anteriorly, broader than long. Tail equal 

 the distance between mouth and vent. Anterior nasal valves confluent in a 

 broad flap with angles rounded and a median prominence toward the teeth; 

 posterior valves with an obtuse lobed fold on the outer side of each nostril. 

 Mouth small, protractile; teeth bands narrow, angular on the outer margins; 

 each tooth with an acute point on the inward margin of the crown. Dorsals 

 subequal, tips rounded; origin of first dorsal above the ends of the ventrals. 

 Caudal longer than deep, angles rounded, hind margin obHque, convex. 



Reddish brown, sides of tail and lower front margins of disk yellowish; 

 lower surfaces and claspers white. 



Tasmania; Austraha. 



Narcine mollis. 



Narcine mollis Lloyd, 1907, Rec. Ind. mus., 1, p. 8; Annandale, 1909, Mem. Ind. mus., 2, p. 43, pi. 3A, 

 f. 3, 3''; Lloyd, 1909, Mem. Ind. mus., 2, p. 144; 1909, 111. zool. Investigator, Fishes, pi. 46, f. 1, 1". 



Especially distinguished by elongated nasal valves, the length of the anterior 

 being nearly equal to the width between the nostrils. Posterior valves well 

 developed, not reaching the mouth. Disk subcircular, length little less than 

 width. Length of snout less than twice the internarial width. Eyes small, 

 orbits equal spiracles. Spiracles without papillae, near the orbits. Nasal valves 

 meeting in a prominence in front of the symphysis at the mouth. Fins blunt. 

 First dorsal rather smaller than second, origin above ends of ventral bases. 

 Tail strong, little longer than the body; caudal fin deep, rounded on the angles, 

 convex on the hind margin. 



The type apparently was a very young specimen; it was taken in the Gulf 

 of Aden, at 130 fathoms. 



Brown, dark above, greyish below. 



DiSCOPYGE. 



Discopyge Tschudi, 1845, Fauna Peruana, Pisces, p. 32. 



Disk circular, about half the total length; preoral section short. A large 

 electric organ between head and each pectoral. Mouth protractile, small. 

 Teeth bands narrow; teeth small, numerous, inward angle acute. Nostrils 

 small, near the mouth; anterior valves confluent, reaching the mouth, free- 

 margined at sides and ends. Eyes small. Spiracles larger than the eyes, at a 

 short distance behind them, not fringed. Gill openings narrow. Tail distinct, 



