1396 Catalogue of Malayan Fishes. [Dec. 



little behind the occiput, on each side, appears a short backwards diverg- 

 ing line of spines. Each shoulder carries a second, a little longer, also 

 directed backwards. In large individuals there is another line beneath 

 the scapular. It consists but of two or three spines. 



The following dimensions were taken from a female 4 ft. If inch in 

 length. 



From the snout to the mouth, . . . , , s ft. 8f inch. 



From the mouth to the anus, 1 3 



From the anus to the caudal, 1 6 



Length of the caudal, 8 



Distance between the anterior angles of the pectorals, 1 3\ 



From the snout to the eyes, 7-f 



Distance between the orbits, 2\ 



„ between the internal angles of the nostrils, 1| 



Breadth of the mouth, 3 



From the point of the snout to the end of the base 



of the pectorals, 1 6f 



Greatest breadth of the keel of the snout If 



Distance between the dorsals 9 



„ between the posterior dorsal and caudal 5J- 



„ between the pectorals and ventrals, 3 



Single individuals occur at all seasons in the Straits of Malacca. 

 Gen. Rhinobatus, (Bloch-Schn. 1801) Milller und Henle, 1841. 

 Skull elongated in a keel, the interval between which and the inter- 

 nal margin of the pectorals is membranous ; snout more or less pointed. 

 The upper nasal valve consists, as in Rhynchobatus, of an external 

 narrow elongated lobule, and an internal which is broader and shorter. 

 The external lobule is narrow, but its rounded apex extends to the lower 

 margin of the nostril, and does not project at an angle from the inner 

 lobule. The external lobule is situated nearly in the middle of the 

 upper margin of the nostril ; the internal lobule extends more or less 

 inwards. The lower nasal valve extends from the external angle more 

 or less inwards. Spiracle and eye surrounded by a common fleshy 

 wall. The upper eyelid carries in the centre a projection. The valve 

 of the upper jaw has a fringed margin and is notched in the centre. 

 The anterior part of the lateral margin of the disk has two slight un- 

 dulations. 



