26 CHONDROPTEBTOII. SELACITOIDEI. 



1. Genus LAMNA, Cuvier. 

 Syn. O.ryrhina, Agassiz. 



Spiracles, if present, minute. No nictitating membrane. Mouth 

 wide. Gill-openings large. Teeth large, awl-shaped, smooth or 

 sometimes with a small lateral basal cusp on either side. The first 

 dorsal fin spineless, placed opposite the interspace between the 

 bases of the pectoral and ventral fins. Lower caudal lobe large. 

 A keel along the side of the tail. A pit at the base of the caudal 

 fin*. 



27. (1.) Lamna spallanzanii. (Fig. 7.) 



Oxyrrhina spallanzanii, lionap. Faun. Itnl., Peso. t. cxxxvi, fig. 1. 

 Lamna spallanzanii, Day, Fish. India, p. 722, pi. clxxxvS, fig. 2 (see 



synon.). 

 Ganumu sorrah, Tarn. 



Fig. 7. Lamna spallanzanii. 



Snout pointed, angle of the mouth about midway between the 

 nostril and the first gill-opening. Gill-openings very wide. Teeth 

 j| on each side, awl-shaped, with sharp but entire lateral edges, 

 and destitute of basal cusps ; the third on each side of the synv 

 physis of the upper jaw smaller than those on either side of it. 

 Fins the base of the first dorsal rather nearer the pectoral than 

 the ventral fin. Pectoral falciform, its inner being one fourth of 

 the length of its outer margin. Second dorsal and anal small, 

 situated opposite one another; the keel on the side of the tail 

 commences in front of the bases of these fins. Colour grey, 

 becoming lighter beneath. 



Lamna yuntheri, Murray (Ann. & Mag. Nat. Hist (5) xiii. p. 349), 

 obtained at Kurracb.ee, is said to differ, having ^| teeth on either 



* In a specimen of this genus, Lamna comulnca, Pennant, in Wales, observed 

 two embryos, and Neill, in 1804, remarked of one six feet long, at Newhaven, 

 that "no fewer than thirty young ones appeared, fifteen in each of two bags. 

 These were all from 12 to 14 inches in length, fully formed, and apparently 

 ready for exclusion." 



