13. CAUCUAKODON. 391 



Oxyrliina, Ayossiz, Pom. Foss. iii. p. 2715, pi. G. tigs. 2, '2a-2d. 



goiiipliodoii, Mail. lS- llenle, p. 08, pi. 28; liocayc Sf Cupdlu, 



Pei.v. l'l(t(/iust. p. lo. 

 Lamna, Oiceii, Odu/ituf/r. pi. 5. fijj. ]. 



Lsuropsis tlekayi, Giif, Ann. Lye. 2\at. Hist. New Yorl<, vii. p. 400. 

 Oxyrliina punctata, Duimril, Elasnwbr. p. 409. 



I'raeoral j)ortion of the snout as long as tile longitudinal axis of 

 the cleft of the mouth, tctrahedral, pointed. Angle of the mouth 

 midway between the gill-opening and nostril. Teeth J-| on each 

 side, long, lanceolate, with sharp lateral edges, without basal cusps. 

 Tlie tbird tootli on each side of the upper jaw is much smaller than 

 tliose next to it. Gill-openings extremely wide, the width of the 

 first being rather more than its distance from the last. Origin of 

 the dorsal tin at a very short distance from the base of the pectorals, 

 which arc fidciform, the length of their lower margin being one- 

 fourth of that of the upper. 



j\Iediterranean and Atlantic. 



f(. Fine young specimen, 33 inches long. Madeira. Presented by 



J. Y. Johnson, Esq. 

 h-d. Jaws of very huge examples. 



3. Lanma glauca. 



Oxyrliina glauca, MHll. il^- Hcnle, p. GO, pi. 20 ; Schhy. Faun. Jajmti. 

 Poiss. p. 303 ; JDumcnl, Elasmobr. p. 409. 



Scarcely distinct from L. spallanzanii, from which it has been 

 separated on account of the more backward position of the dorsal 

 tin, which is opposite to the middle of the interspace between pec- 

 toral and ventral. 



Japan ; Cajjc seas. 



a. Stuffed, 36 inches long. Cape seas. 



b. Stuffed, 29 inches long. 



c. Jaws. St. Helena. Presented by J. C. Melliss, Esq. 



13. CARCHARODON. 



Carcharodon, {A. Smith*) Miiller 8,- Henle, p. 70. 



The first dorsal fin opposite to the space between the pectoral 

 and ventral, without spine ; the second and the anal vciy small. A 

 pit at the root of the caudal, which has the lower lobe wcU de- 

 veloped. Side of the tail with a keel. No membrana nictitans. 

 Spiracles minute (and probably frequently absent). Mouth crescent- 

 shaped, wide. Teeth large, flat, erect, regularly triangular, ser- 

 rated. Gill-openings wide. 



Temperate and tropical seas. 



* Tlio author of the fii'st volume of the ' Tchthyologic Generate ' will be glad 

 to hear Ihat^lSir Antlrtw Siiiitli c-oiilinues to take interest in the progress ol' his 

 tavourilc seieuee (187<l). See JJumeril, Elasmobr. p. J Id, Iboluote 1. 



