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Show 564 MR. M. JACOBY ON NEW [Nov. 1, tinus, characterized by the great length of the rostrum and the extreme compression of the dental alveoli. The occipital region is more like that of the Caucasian fossil than is Pontistes, but there is not the square flat surface behind the nostrils ; while the dental alveoli are quite different from those referred to the Caucasian form. None of the other fossil forms referred to the Platanistidee, of which the skulls are known, have the maxillary fossae of the Inia type ; and I accordingly regard the Caucasian skull as indicating a new genus and species, for which I suggest the name Iniopsis caucasica. The evidence that the Platanistidee are a very ancient type has been gradually accumulating ; but the European Tertiary forms hitherto referred to that group have more Dolphin-like skulls. The occurrence of a form so closely allied to the South-American types in Russia is therefore a matter of considerable interest. Its association with the North-American Tertiary genus Zeuglodon is also significant, and suggests that both these groups of Cetaceans had originally a wide distribution. P.S.-Since this paper was in type I have received from Dr. Sjogren a copy of an article1 in which the Cetacean-yielding strata of the Caucasus are assigned to the Eocene. EXPLANATION OF THE PLATES. PLATE XXXVI. Fig. 1. Inner side of hinder part of the left ramus of the mandible of Zeuglodon caucasicus. \. Fig. 2. Dorsal aspect of left humerus of the same, h, head ; t, greater tuberosity ; d, deltoid ridge; r, radial facet; u, ulnar facet, j. Fig. 3. Inferior aspect of imperfect caudal vertebra. \. P L A T E XXXVII. Figs. 1, 1 a. Anterior and right lateral aspect of centrum of posterior cervical vertebra of an undetermined Cetacean (? Platanistidee). a, upper, b, lower transverse process, y. Figs. 2, 2 a. Anterior and inferior aspects of anterior caudal vertebra of the same. ^. Figs. 3, 3 a. Fragment of jaw of (?) Iniopsis caucasica. \. P L A T E XXXVIII. Fig. 1. Frontal aspect of imperfect cranium of Pontistes rectifrons. f. (After Burmeister.) Fig. 2. Corresponding view of imperfect cranium of Iniopsis caucasica. f. 5. Descriptions of some new Genera and new Species of Phytophagous Coleoptera from Madagascar. By M A R T I N JACOBY, F.E.S. [Eeceived September 1, 1892.] (Plate X X X I X .) But little is known at present of the Phytophagous Coleoptera of Madagascar, especially so far as the smaller species are concerned, and it is probable that many interesting forms will be found by a 1 Meddel. TJpsala Univ. Min.-Geol. Inst. vol. xiii. arts. 2, 3 (1891). |