11. LAMNID^: - LAMNA. 29 



pectorals, nearly midway between them and the ventrals. This position 

 is represented in DeKay's figure (Nat. Hist. N. Y. Fishes, pi. 63, fig. 

 206). Atlantic Ocean ; Cuba (Poey). 



(Oxyrhina ijlauca Miiller & Henle, 69: Lamna punctata DeKuy (not of Mitchill), 

 352: Isuropsin dekayi Gill, Aun. Lye. N. Y. viii, 153: Lamna glauca Giiutlier, viii, 391.) 



** Dorsal tin inserted close behind the root of the pectorals, ninch nearer pectorals 



than ventrals. (Isurus.) 







36. I. oxyrhyiiclius Raf. SJiarp-nosed SharJc ; Mackerel Shark. 



"Praeoral portion of -the snoiit as long as the longitudinal axis of the 

 cleft of the mouth, tetrahedral, pointed. Angle of the mouth midway 

 between the gill-opening and nostril. Teeth on each side ; long, lan- 

 ceolate, with sharp lateral edges, without basal cusps. The third tooth 

 on each side of the upper jaw is much smaller than those 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 dis- 

 tance from the base of the pectorals, which are falciform, the length of 

 their lower margin being one-fourth of that of the upper." (Gimther.) 



(Storer's figure of "Jjamna. punctata" (Fish. Mass. pi. 37, f. 1) repre- 

 sents, so far as the position of the dorsal is concerned, the present 

 European species, instead of the preceding. Xo mention is made of the 

 presence of lateral cusps on the teeth. The occurrence of a true Isurus 

 on our coast does not seem, however, to have been verified, although it 

 is not improbable.) 



(Lamna punctata Storer, Fish. Mass. 225: Lamna spallanzanii Giiuther, viii, 390: 

 ^ oxyrkyncliiis Raf. Caratteri, etc.) 



27. LAMNA Cuvier, 1817. 



Pt.rbeagles. 



(Cuvier, Regue Animal, ii : type Xt/mil/i* corniibicHK Gmrliu.) 



Body short and stout, the bade considerably elevated ; snout promi- 

 nent, pointed ; teeth triangular, pointed, entire, each one with a small 

 cusp on each side at base ; (one or both of these sometimes obsolete iu 

 the young on some of the teeth ;) gill-openings wide ; dorsal and pectoral 

 lius somewhat falcate ; second dorsal and anal iins very small, nearly 

 opposite each other ; first dorsal close behind the root of the pectorals. 

 (Aa/jiva, a kind of shark, from ///:, a horrible anthropophagous monster, 

 into which a daughter of Belus was changed by Juno, because she was 

 beloved by Jupiter ; a bugbear used by the Greeks to frighten refractory 

 children.) 



