cfiH'<' 



''^N so 1883 



lf^'.i2.] '^1'^ [Cope. 



Teeth simple, conic ; sitiiated on premaxillar}', maxillary and dentary 

 bones only. Premaxillary with but one, a median tooth. 



The genus Lepidosternnm, as typified by the L. ortostegum, differs from 

 Rhineura in that the nasal bones are excluded from the nareal borders 

 by the maxillary, and from contact with each other by the prolonged 

 spine of the premaxillary. In both of these points Rhineura agrees with 

 Amphisbtena. In Lepidosternnm also there is a Meckelian groove, and 

 the angle is turned vertically downwards. In AmpMsbcena (fuUginosa) 

 there is a groove and no angle. 



Plate II. 



Figs. 1-8. Feylinia currorii Gray ; X 2 : from Gaboon, West Africa ; 



specimen in Museum Academy Natl. Sciences, Philadelphia. 

 Fig. 1. Skull, three views; 2, skeleton of pectoral region ; 3, skeleton of 



sacro-pelvic region. 

 Fig. 4. Anniclla pulchra Gray ; skull, X 3 ; from San Diego, California ; 



from specimen in my private collection presented by Mr. James S. 



Lippincott. 

 Fig 5. Rhineura floridana Baird ; skull, X 3; from Volusia, Fla. ; from 



specimen in ray private collection from Mrs. A. D. Lungren. 



The principal characters of the osteology of the Feylinia and 

 Anniella I described in the Proceeds. Academy Philadelphia, 1864, 

 pp. 228-230 ; and the pelvic arch of the latter and of Rhineura in a 

 paper now in press in the Americdn Journal of Morphology. Addi- 

 tional characters of all the above forms are described in the preceding 

 pages. 



Lettering. — Pmx., premaxillary; N., Nasal; F., frontal; P., parietal; 

 So., supraoccipital ; Mx., Maxillary ; Pef., prefrontal ; L., lachrymal ; J., 

 jugal ; Pof., poslfrontal ; Pob., postorbital ; Pofb.. postfrontoiirbital ; St., 

 supratemporal ; Pao., paroccipital ; Eo., exoccipital ; Os., orbitosphenoid ; 

 Pop., postoptic ; Epg., epipterygoid ; Pe., petrosal; Q., quadrate; Stp., 

 stapes ; F., vomer ; PL, palatine ; Pg., pterygoid ; Sep., ectopterygoid ; 

 Sp., sphenoid ; Bo., basioccipital ; Art., articular ; Co., coronoid ; Ang., 

 angular ; Spl., splenial ; D., dentary ; CI., clavicle ; R., rib ; S., sacrum ; 

 to., pelvis. 



Plate III. 



Hyoid bones of Lacertilia. 



Fig. 1. Sphenodon punctatum Gray ; nat. size ; from specimen pre- 

 sented by Sir James Hector. 



2. Chamceleon sp. ; from Cuvier ; nat. size. 



3. Gecko verticillatus Laur. ; nat. size ; from Cuvier. 



4. Aristelliger prcesignis Hallow. ; nat. size ; dissected and drawn 



by Dr. E E. Gait. 



