628 CLASS XVII. 



GUER., Iconogr., Mammif. PI. 47, fig. I ; the common dolphin, dorsal fin 

 behind the middle of back ; from forty to forty-five teeth on each side in 

 both jaws. This species becomes 8' long, and occurs in the North Sea and 

 the Mediterranean Sea. It is the Delphinus of the ancients, of which they 

 have given many wonderful accounts, amongst which the myth of ARION 

 claims a distinguished place, HEROD. 1.241 . Delphinus Tursio FABR., Cuv., 

 HUNTER Phil. Trans. (1787), Vol. 77, PI. 18, SCHLEGEL Abhandl. aus dem 

 Oebiete der Zool. I. PI. 5, figs, i, 2, the 'bottle-nosed dolphin, about twenty- 

 four teeth on each side above and below ; the dorsal fin almost in the middle 

 of the back ; this species is usually from eight to eleven feet long, some- 

 times more. 



In other species the head is not prolonged into a snout, but is blunt 

 (sub-genus Phoccena Cuv.). Here belongs Delphinus Phoccena L., SCHREBER 

 Saugth. Tab. 342, CUVIER Menag. du Mus. national d'Hist. nat. Livraison 

 7, with a figure of MARECHAL, Cuv. R. Ani., ed. ill., Mammif. PI. 97, 

 fig. 3, GUE"R. Iconogr., Mammif. PI. 47, fig. 2 ; the common porpes&e, le 

 marsouin; this species is rarely more than 4' long, and is the smallest and 

 most common of this family. It frequents the North Sea and also occurs 

 in the Zuider-Zee; usually it keeps near the shore, and swims in company 

 in large or small packs. There are from twenty to twenty-four small teeth 

 on each side in both jaws ; the dorsal fin stands on almost the middle of the 

 back, nearer however to the tail than to the head. Compare on the anatomy 

 of this species PAULSON Skrivter of naturh. Selskabet, n. 2, 1 793, pp. 1 1 1 

 121, ALBERS Icones ad ill. Anat. comp. fasc. n. Tab. v vn., V. BAER in 

 OKEN'S Isis 1826, s. 807 u. ff., STANNIUS in MUELLER'S Archiv, 1849, s. 

 i 41 (description of the muscles), c. Delphinus globiceps Cuv. Ann. du 

 Mus. Tome 19, PI. I. figs. 2, 3 ; this species with a blunt head belongs to 

 those to which the name of Bidzkopf has been assigned; it is called by 

 English writers the round-headed grampus; it has a fin standing on the 

 anterior part of the back, and only few teeth (nine or ten on each side of 

 both jaws). This dolphin may attain a considerable length, more than 

 20'. In some species there is no dorsal fin. Of such LACEPEDE forms 

 the unnecessary sub-genus Delphinapterus. Sp. Delphinus leucas PALLAS 

 Zoogr. Rosso- Asiat. Tab. i. SCHREB. Saugth. 349, SCORESBY Arctic Reg. 11. 

 PI. 4 ; the Beluga; a large species from the high North ; a very rare visitant 

 of the British seas, JENYNS Brit. Vert. Ani. p. 43. 



Family IX. Sirenia ILLIO. s. Cetacea herbtvora. Nostrils 

 opening in the upper lip at the anterior part of head. Molar teeth 

 with flat crowns, or a horny lamina in place of teeth in both jaws. 

 Two pectoral mammas. Setae in the lips ; body furnished with 

 scattered hairs, especially in younger individuals. 



The herbivorous cetaceans were formerly placed in the neighbour- 

 hood of the seals ; the lamantin was united with the walrus in the 

 same genus (Trichechus). They are distinguished, however, like the 

 true cetaceans, by the absence of hind limbs. CAMPER had shewn 

 the resemblance of these animals to the whales ((Euvres, n. pp. 



