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Show 722 DR. J. E. GRAY ON THE SKULLS AND [NOV. 4, Hab. ? Obs. In the specimen before me, which is the only one I have seen, the plaits or folds on the columella appear to be six or seven, through the intersection of the transverse ribs passing into the interior. DESCRIPTION OF PLATE LIX. Fig. 1. Cyclostoma balteatum, p. 718. 2. filo-striatum, p. 718. 3. consanguineum, p. 718. 4. Typhis expansus, p. 719. 5. Eutrochus alternatus, p. 719. 6. Tornatella alba, p. 720. 7. Pyramidella canaliculata, p. 720. 8. Pleurotoma (Brillia) brunneomaculata, p. 720. 9. (Brillia) strigata, p. 720. 10. Cardium arcuatulum, p. 721. 11. Conus racemosus, p. 721. 12. Cancellaria turrita, p. 721. P.S. The Pleurotomee, Cone, and Pyramidella above described were from the collection of the late M . Frick (French Consul at Honolulu), who collected in the Sandwich Islands and also in California. It is probable that the Cone and Pyramidella were collected by him in the former, and the Pleurotomee (Drillice) in the latter locality. The Typhis was found in the collection of the late Thomas Norris without any information as to locality. The Eutrochus is, I think, in all probability an Australian shell. Of the habitat of the Cancellaria I have no information. If I might be permitted to prophesy, I should say it would be discovered some day in the north of China. 10. O n the Skulls and Alveolar Surfaces of Land-Tortoises (Testudinata). By Dr. J. E . G R A Y , F.R.S. &c. [Received September 15, 1873.] (Plate LX.) Zoologists have generally been satisfied with regarding the Land- Tortoises as a single genus-except in separating the species that have only a rudimentary and clawless fifth toe on the front foot, as in Testudinella and Homopus, or where the front lobe of the sternum is mobile, as in Pyxis, or the hinder lobe of the back more or less movable, as in Kinixys. I ventured to separate Scapia on account of the peculiarity of the form of the skull, and long ago to separate the skull of Testudo planiceps from that of I7, indica, although I had never seen the skulls, or at least did not then know that it was the skull of Testudo elephantopus from Galapagos. The acquiring of the skeletons and skulls of additional species of Tortoises has shown the excellent characters which the skulls afford |