Platanista, _Gray_, _l. c._ p. 221; _Synops. Whales & Dolph._ p. 4. Vertebræ 51: cervical 7, all separate; dorsal 11; lumbar 8; caudal 25. 1. Platanista gangetica. Platanista gangetica, _Gray_, _l. c._ p. 223; _Synops. Whales & Dolph._ p 4. Inhab. India, Ganges. 2. Platanista Indi. Platanista Indi, _Gray_, _l. c._ p. 224; _Synops. Whales & Dolph._ p. 4. Inhab. India, Indus. Division II. _Nostrils both united into a single central transverse or crescent-shaped blower on the back of the crown_ (cf. p. 57). Suborder V. DELPHINOIDEA. Delphinoidea, _Gray_, _Synops. Whales & Dolph._ p. 4. Nostrils two, united into a single central transverse or crescentic blower on the back of the crown. Teeth in both jaws, permanent, or rarely deciduous by age. Pectoral fin lanceolate, ovate, or truncated. Head generally beaked. Dorsal fin falcate or wanting. Skull beaked; maxillary bone spread out over the orbit. I. _Pectoral fin elongate, obliquely truncated on the inner side. Fingers elongate, longer than the arm-bones, unequal; the second and third much the longest; the rest short. Forearm-bones close together, only separated by a straight line. Carpal bones moderate, 5 or 7_ (cf. p. 85). A. _Pectoral fin on the side of the body. Second and third fingers of six or eight phalanges_ (cf. p. 82). Family 9. INIIDÆ. Iniidæ, _Gray_, _l. c._ pp. 62, 226; _Synops. Whales & Dolph._ p. 4. Platanistidæ (Iniinæ), _Flower_, _Trans. Zool. Soc._ vol. vi. p. 114. Fluviatile. Head beaked; beak bristly. Teeth in the jaws, rugulose, crowns with an internal lobe; permanent. Pectoral fin large, elongate, subfalcate. Back keeled behind, without any dorsal fin. Skull—jaw compressed; symphysis of lower jaw elongate, extending for more than half its length. Overlooking the form of the blower, Mr. Flower places this genus with Platanistidæ. Vertebræ 41. C. 7. D. 13. L. 3. C. 18. The smallest number of any Cetacean known. “Costal cartilages not ossified. The tubercular and capitular articulations of the ribs blending together posteriorly. Cervical vertebræ all free. Pterygoid bones thin, not conforming in their mode of arrangement with either of the other sections. Jaws very long and narrow, both with numerous teeth having compressed fangs. Symphysis of mandible very long, exceeding half the length of the entire ramus. Orbit very small. Lachrymal bones not distinct from the jugal. Pectoral limbs large. Dorsal fin rudimentary.”—_Flower._ “Maxillary crests absent, or very slightly developed. Many of the teeth with a complete cingulum or a distinct tubercle at the base of the crown. Pectoral fin ovate, obtusely pointed.”—_Flower._ 1. INIA. Inia, _Gray_, _l. c._ p. 226; _Synops. Whales & Dolph._ p. 4; _Flower_, _Trans. Zool. Soc._ vi. p. 87.