DELPHINUS.] MAMMALIA CETACEA. 41 



somewhat pointed at the extremity : jaws nearly equal, the upper being 

 slightly shorter than the lower: teeth very numerous, Jfs to ^ = 168 

 to 188, slender, somewhat bent inwards, sharp-pointed ; placed at equal 

 distances from each other, and locking in between each other when the 

 jaws are closed: eyes small, almost in a line with the mouth: blow-hole 

 situate on the top of the head a little above the eyes : pectoral fins placed 

 very low, in form somewhat falcate : dorsal fin pointed, taking its origin 

 from a little beyond the middle of the back ; rather elevated, and when 

 measured along the line of flexure, equalling one-sixth of the entire 

 length of the body : tail crescent-shaped. Skin smooth ; of a dusky 

 colour above, white beneath, and grayish on the sides. 



Met with occasionally on the British shores, but not of very frequent 

 occurrence. Feeds on animal substances. Period of gestation said to 

 be ten months. Produces one or two at a birth. 



64. D. Tursio, Fab. (Blunt-toothed Dolphin.) Jaws 

 moderately produced ; the lower longer than the upper : 

 teeth rather more than twenty on each side above and 

 below ; straight, with obtuse summits. 



D. Tursio, Desm. Mammal, p. 514. Flem. Brit. An. p. 37. D. trun- 

 catus, Mont, in Wern. Mem. vol. in. p. 75. pi. 3. Bottle-nose 

 Whale, Hunter in Phil. Trans, for 1787. pi. 18. 



DIMENS. Entire length eleven feet: girth seven feet four inches: 

 length of the mouth fourteen inches ; from the snout to the eye sixteen 

 inches ; from the same to the pectoral fin two feet ; from the same to the 

 dorsal four feet eight inches ; from the same to the vent seven feet three 

 inches; length of the dorsal twenty-three inches; height of the same 

 ten inches. 



DESCRIPT. Larger than the last species : lower jaw projecting further 

 beyond the upper : teeth less numerous, H^li to HiH = 84 to 92, straight, 

 somewhat conical, but blunt and truncated at the extremity. 



But little known as a British species. Hunter's specimen was caught 

 upon the sea-coast near Berkeley, and is now in the Museum of the 

 College of Surgeons. In the same collection is a second individual from 

 the Thames. The one described by Montagu, which appears to have 

 been large and aged, with the summits of the teeth more than usually 

 truncated, was taken in the river Dart, in 1814. The measurements 

 given above are those of a fourth individual which occurred a few years 

 since in the river at Preston. They were obligingly sent me by Mr 

 Gilbertson of that place. 



(2. PHOCCENA, Cuv.) . 



65. D. Phoccena^ Linn. (Porpesse.) Under jaw slightly 

 projecting beyond the upper : teeth twenty-two to twenty- 

 five on each side above and below ; straight, compressed, and 

 rounded at the summits. 



D. Phoccena, Desm. Mammal, p. 516. Flem. Brit. An. p. 33. Por- 

 pesse, Penn. Brit. Zool. vol. in. p. 69. Shaw, Gen. Zool. vol. n. 

 p. 504. pi. 229. 



DIMENS. Entire length from four feet to five feet and a half. 

 DESCRIPT. Body elongated, gradually tapering towards the tail: 

 snout short, rather obtuse at the extremity : under jaw somewhat longer 



