OCR Text |
Show 172 MR. F. E. BEDDARD ON AN [Feb. 17, Vertebrae fully ossified, cervicals opisthoccelous l, dorsals biconcave; no hypapophyses between the dorsal vertebras; limb-bones with condyles ; humerus with ectepicondylar foramen or groove 2. Proterosauridce. Subord. II. RHYNCHOCEPHALIA VERA. Each transverse segment of the plastron composed of three pieces, a median angulate and a pair of lateral. Pubis and ischium elongate and fifth metatarsal modified, as in the Lacertilia. A. Nasal openings distinct. Mandible with coronoid process, the rami not united by suture. Vertebras deeply biconcave. Humerus with ectepicondylar and entepicondylar foramen ; ribs with uncinate processes ; all the vertebras with intercentral hypapophyses 3. Hatteriidce. Humerus with entepicondylar foramen ; ribs without uncinate processes; no hypapophyses between the dorsal vertebras 4. Homceosauridce. B. Nasal opening single. Mandible without coronoid process, the rami united in a solid symphysis. Vertebras fully ossified, feebly biconcave ; no hypapophyses between the dorsal vertebras. Humerus with ectepicondylar foramen or groove. Snout short, ending in a beak ........ 5. Rhynchosauridce. Snout Crocodilian in shape, with toothed prasmaxil-laries 6. Champsosauridce. The first family comprises a single genus, Palceohatteria, Credn.; the second, Proterosaurus, H. v. Mey., and perhaps Cadaliosaurus, Credn., and Aphelosaurus, Gerv. ; these four types are Permian. The third family is for the recent Sphenodon, Gray; the fourth contains the Jurassic Homceosaurus, H . v. Mey., Sapheosaurus, H. v. Mey., and Pleurosaurus, H . v. Mey. ; the fifth the Triassic Rhynchosaurus, Ow., and Hyperodapedon, Huxley; the sixth and last the Upper Cretaceous and Lower Eocene Champsosaurus, Cope. 6. Preliminary Account of an Earthworm from West Africa referable to a new Genus. By FRANK E. BEDDARD, M.A., F.R.S.E., Prosector to the Society. [Received February 17, 1891.] The investigations of Rosa2, Michaelsen3, aud myself4 have 1 I think, after careful examination of the type specimen in the College of Surgeons, that the cervical vertebras were opisthoccelous in Proterosaurus, as described by Seeley; that hypapophyses were absent, except between the anterior-most cervical vertebras ; and that the long, slender cervical ribs were forked proximally. 2 " Lombrichi dello Scioa," Ann. Mus. Civ. Genova, vol. vi. (1888). 3 " Beschreibung der von Herrn Dr. Franz Stuhlmann im Miindungsgebietdes Sambesi gesammelten Terricolen," Jahrb. H a m b . Wiss. Anstalt, Bd. vii. (1890); and " Oligochasten des naturhistorischen Museums in Hamburg, IV.," ib. Bd. viii. (1891). _ 4 "Preliminary Note on a new Earthworm belonging to the Family Eudri-lidas," Zool. Anz. no. 346 (1890); and " Preliminary Note upon Heliodrilus, a new Genus of Eudrilidas," ib. No. 349 (1890). |