Pterodadyles — Diniorphodon. 3 



obtained from the Solenhofen Limestone in Bavaria — others ptero- 

 occur in the Great Oolite at Stonesfield, near Oxford, and in dactyles. 

 the Lias formation, Lyme Regis, Dorset. The most remarkable Wall-case, 



Fig. 3. — The almost complete skeleton of Ptcrodactylus antii^uus (SOmmerring', from Table-case, ' 

 the Lithographic Stone, Eichstildt, Bavana (J nat. size), a, humerus; 6, radius and jj-q_ j. 

 ulna; c, carpus; d, metacarpus; c, clawed difcits; /, g. h, i, phalangeals of ulnar 

 digit; /c, rib ; I, femur; s, tibia; r, tarsus; m, metatarsals; (, t', phalangeals of pes. | 



Fig. 4. — Left lateral view of skull of Pteranodonlongicfps (Marsh), from the Cretaceous 

 of North Ameiica (^V nat. size), a, preorbital vacuity; 6, orbit: c, supraorbital 

 crest; il, angle of mandible; q, quadrate; s, symphysis. (Not represented in the 

 Collection.) 



of these English examples is the DimorpJiodon macronyx from Dimorph.o- 

 the Lias of Lyme, which had a large head, the jaws armed with don. 

 lancet-shaped teeth, along tail, and well-developed wings. The Wall-case, 

 skull was 8 inches in length, and the expanse of the wings 

 about 4 feet (see Fig. 5). 



Many remains have been discovered by Prof. Marsh in the 

 Chalk of North America. One singalar form, named by him 



2 2 



No. 1. 



