172 MR. F. E. BEDDARD ON AN [Feb. 17, 



Vertebrae fully ossified, cervicals opisthocoelous *, 

 dorsals biconcave; uo hypapophyses between 

 the dorsal vertebris ; limb-bones with condyles ; 

 humerus with ectepicondylar foramen or 

 groove 2. Proterosaurid(P. 



Subord. II. Ehynchocephalia vera. 

 Each transverse segment of the plastron composed of three pieces, a median 

 angulate and a pair of lateral. Pubis and ischium elongate and filth meta- 

 tarsal modified, as in the Lacertilia. 



A. Nasal openings distinct. Mandible with coronoid 



process, the rami not united by suture. Vertebrae 

 deeply biconcave. 

 Humerus with ectepicondylar and entepicondylar 

 foramen ; ribs with uncinate processes : all the 



vevtebrce with intercentral hypapophyses 3. Hatteriid<B. 



Humerus with entepicondylar foramen ; ribs with- 

 out uncinate processes ; no hypapophyses be- 

 tween the dorsal vertebra? .' 4. Hom<Bosaurid(B. 



B. Nasal opening single. Mandible without coronoid 



process, the rami united in a solid symphysis. 

 Vertebra fully ossified, feebly biconcave ; no hypa- 

 pophyses between the dorsal vertebrae. Humerus 

 •with ectepicondylar foramen or groove. 



Snout short, ending in a beak 5. Rhynckosauridoe. 



Snout Crocodilian in shape, with toothed priEmaxil- 



laries 6. CkarapsosauridcB. 



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 Rhynchosnurus, 

 Ow., and Hyperodapedon, Huxley ; the sixth and last the Upper 

 Cretaceous and Lower Eocene Champsosaurus, Cope. 



6. Preliminary Account of an EarthTrorm from West Africa 

 referable to a new Genus. By Frank E. Beddard, 

 M.A., F.B.S.E., Prosector to the Society. 



[Eeceived February 17, 1891.] 

 The investigations of Rosa", Michaelsen ^ and myself* have 



1 I think, after careful examination of the type specimen in the College of 

 Surgeons, that the cervical vertebras were opisthocoelous in Proterosaurus, as 

 described by Seeley ; that hypapophyses were absent, except between the anterior- 

 most cervical vertebrae ; and that the long, slender cervical ribs were forked 

 proximally. 



^ "Lombricbi deUo Scioa," Ann. Mus. Civ. Geneva, vol. vi. (1888). 



' " Beschreibung der von Herrn Dr. Franz Stuhlmann im Miindungsgebietdes 

 Sambesi gesammelten Terricolen,"' Jahrb. Hamb. Wiss. Anstalt, Bd. vii. (1890) ; 

 and " Oligochseten des naturhistorischen Museums in Hamburg, IV.," ib. Bd. 

 viii. (1891). 



* "Preliminary Note on a new Earthworm belonging to the Family Eudri- 

 lid£e''Zool. Anz. no. 346 (1890): and " Preliminarv Note upon Heliodrilus, a 

 new Genus of Eudrilida," ih. No. 349 (1890). 



