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Show 1867.] MR. ST. GEORGE MIVART ON INDRIS DIADEMA. 247 them. They use their 'flukes,' or caudal fins, much less than the Bight or Whalebone Whales. They will often lock their jaws, and turn on their sides and twist about. As to this being the cause of deformity, of course it is only opinion, but the general opinion. Such deformed Whales are generally fat; but this is accounted for hy the fact that they are generally 'lone,' or single Whales, and their food, which is the Squid or Cuttlefish, can be nearly as easily captured by the deformed jaw as by the other. The Sperm-Whale will often in his ' flurry,' or death struggle, vomit up large pieces of Squid. Our place being eminently a whaling city, portions of the skeleton of the Sperm-Whale, such as jaws, skulls, & c , are often brought home in our whale-ships. Should any of these be of use to you, I will endeavour to send you such as you may require, or any other specimens of natural history which may be of service to your honourable Society. " I notice also a paper in the ' Proceedings' (1864, p. 170) on the Bonnet of the Bight or Whalebone Whale. Such appendage or bonnet is an invariable portion of the Bight Whale from the Northwest Coast and Arctic Sea ; it is a development of the cuticle, similar to the nails of Mammalia, or the hoofs of the Ruminants." The following papers were read :- 1. On the Skull oi Indris diadema. By ST. G E O R G E MIVART, F.Z.S. &c. (Plate XVIII.) INDRIS DIADEMA. Propithecus diadema, Bennett, Proc. Zool. Soc. 1832, p. 20. Macromerus typicus, A. Smith, South African Journal, 2nd. ser. ii. p. 49 (1833)- Lemur diadema, De Blainville, Osteographie, Primates, Lemur, pp. 23 & 37, pl. 8 (skull), pl. 11 (immature dentition). Habrocebus diadema, Wagner, Schreber, Suppl. i. (1840), p. 260 ; v. p. 141. Propithecus diadema, Lesson, Species des Mammiferes (1840), p. 219 ; Van der Hoeven, Tijdschr. v. Nat. Gesch. xi. p. 44 (1844) ; Isid. Geoff. St.-Hilaire, Catalogue des Primates, p. 68 (1851); Dahl-bom, Studia Zool. p. 203 ; J. E. Gray, Proc. Zool. Soc. 1863, p. 133 ; St. George Mivart, Proc. Zool. Soc. 1864, p. 638, and 1866, p. 167. In March 1866 I had the honour of laying before the Society a description of a skin, a skull, and some other parts of the skeleton of the Woolly Lemur (L. laniger of Linmeus). At the end of that paper I gave the distinctive characters of that form and those of the Indri, adding such ones of P. diadema of Bennett as I had been able to gather from the scanty materials then accessible. I am now enabled to complete that memoir, through the remarkable kindness and liberality of Professor Peters of Berlin, who has not only transmitted to me for examination a perfect and nearly adult skull of the Propithecus diadema of Bennett, but has expressly |