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Show 484 MR. ST. G. MIVART ON THE LEMURS. [May 20, f. Skull and horns ( tf ) brought by Baikie from Niger. Mus. g. Skull and horns brought hy Baker from East Africa (fig. 5, p. 481). Mus. Brit. h. Living animal in the Berlin Zoological Gardens. The following are specimens representing females :- i. Skull and horns brought by Baikie from the Niger. Mus. Brit. ;'. Younger specimen from the same locality. 'k, 1. Captain Clapperton's two specimens (fig. 3, p. 478). Mus. Brit. m. Liviug animal at Berlin. 2. On Lepilemur and Cheirogaleus, and on the Zoological Rank of the Lemuroidea. By ST. G E O R G E M I V A R T , V.P.Z.S. [Eeceived April 15, 1873.] (Plate XLIII.) The increase which has taken place in the zoological treasures our National Collection enables me to offer to the Zoological Society of London, some notes on the Lemuroidea, to supplement the two papers which I have had the honour to communicate to this Society on previous occasions*. There are now in the British Museum complete skeletons of Indris diadema, I. laniger, and Lepilemur mustelinus, as well as no less than three detached skulls of the last-named genus. I find that the new skull and skeleton of i". lanigerf serve to confirm all the characters before attributed by mej to that species, except that the suprazygomatic backwardly projecting process of the malar is rudimentary, that the nasal bones become gradually narrower transversely from before backwards, and that the fourth metacarpal is the longest. I find also that it agrees with Indris brevicaudatus and differs from the genus Lemur in the following points:- 1. The spine of the axis is produced forwards, but not backwards. 2. The spine of the sixth cervical vertebra is largely developed and the most elongated, not counting the axis. 3. The cervical neural laminae are medianly notched posteriorly. 4. The neural lamina of the seventh cervical vertebra is the shortest antero-posteriorly after that of the atlas. 5. There is a marked, antero-posteriorly directed hypapophysial ridge running medianly beneath the centrum of the 2nd, 3rd, 4th, and 5th cervical vertebrae, each such ridge ending in a posteriorly and downwardly directed hypapophysial process. 6. There are eight lumbar vetebrae. 7. The spinous processes of the lumbar vertebrae are subquadrate and nearly vertical. * P. Z. S. 1864, p. Oil, and 1807, p. 960. t No. 15124. | P.Z.S. 1800. p. 151. |