26 NOTIDANID^. 



A specimen had been also taken in the preceding year 

 by Captain Swinburne, and presented to the British 

 Museum, which likewise possesses a portion of the jaw 

 from Dr. Mantell's collection. The origin of the latter 

 is not stated, and the other two are the only instances 

 known of this Shark being taken in the British seas. 



The nostril is nearer to the tip of the rounded snout than 

 to the angle of the mouth, and the spout-hole nearer to the 

 first gill-opening than to the eye. The hooked upper front 

 teeth rise from a broad base, and the succeeding seven or 

 eight large teeth are serrated on the distal edge, the first 

 denticle being decidedly the tallest. The front man- 

 dibular tooth has lateral serratures, but no middle cusp, 

 and the following five or six broad teeth on each side are 

 equally serrated on the exterior and longer border by 

 from nine to eleven denticles : their thinner inner borders 

 are finely serrated. Dorsal notched on the edge, so placed 

 that the anal commences before the middle of its base, and 

 half-way between the vent and the caudal fin. Pectoral 

 quadrangular, with rounded corners. Anal rounded ante- 

 riorly, pointed posteriorly. A distinct under lobe to the 



