Hurler — Herpetology of Missouri. 273 



EXPLANATION OP ILLUSTRATIONS. 



Plate XVIII. — Pig. 1. Open mouth of Amhystoma tigrinum Green. 

 Vt. Vomerine teeth. Pt. Parasphenoid bands of teeth. Ch. Chcanae. 

 T. Tongue. — Pig. 2. Open mouth of Amhystoma microstomum Cope. — 

 Fig. 3. Open mouth of Plethodon glutinosus Green.— Pig. 4. Open 

 mouth of Spelerpes longicaudus Green. — Pig. 5. Head of Spelerpes, 

 showing mushroom shaped tongue. — Pig. 6. Roof of mouth of Spelerpes 

 maculicaudus Cope. Pig. 7. Open mouth of Typhlotriton spelaeus 

 Stejn. — Pig. 8. Open mouth of Diemyctylus viridescens, showing the 

 parasphenoidal teeth arranged in V form. — Pig. 9. Open mouth of Rana 

 catesbiana Shaw. Ch. Choanae. E. Opening of eustachian tube from 

 ear. El. Elevations caused by the eye balls. P. Pood passage. L. 

 Opening to larynx and lungs. Vc. Opening into vocal sac. Vmt. 

 Vomerine teeth. T. Tongue. 



Plate XIX. — Pig. 1. Ventral view of shoulder girdle of Rana cates- 

 Mana. The shoulder girdle is grown together in front, and the chest 

 is not expansible (firmisternal type). Om. Omosternum. CI. Clavicle. 

 Sc. Scapula. H. Humerus. Co. Coracoid. Ep. Epicoracoid. Me. Metas- 

 ternum. Xs. Xiphisternum. — Pig. 2. Ventral view of shoulder girdle 

 of Bufo amcricana. The shoulder girdle is overlapping in front, and 

 the chest expansible. (Arciferous type.) — Pig. 3. Dorsal view of 

 pelvis girdle of Rana catesMana. Sd. Sacral diapophyses, cylindrical. 

 II. Ilium. Us. Urostyle. Is. Ischium. Fig. 4. — Dorsal view of pelvic 

 girdle of Bufo americana. Diapophyses of sacral or ninth vertebra 

 dilated. 



Plate XX. — Pig. 1. Rana areolata. a. Hind foot. b. Pore foot. — ^Pig. 

 2. Rana clamatans. a. Hind foot. b. Pore foot. — Pig. 3. Rana cates- 

 Mana. a. Hind foot. b. Pore foot. — Pig. 4. Acris gryllus. a. Hind 

 foot. b. Pore foot. — Pig. 5. Chorophilus triseriatus. a. Hind foot. b. 

 Pore foot. — Pig. 6. Hyla versicolor, a. Hind foot. b. Pore foot. 



Plate XXI. — Pig. 1. Dorsal view of head of Elaphe ohsoletus. a. 

 Rostral, b. Internasals. c. Prefrontals, d. Frontal, e. Supraorbitals. 

 f. Parietals. z. Dorsals. — Pig. 2. Side view of the same head. g. Nasals, 

 h. Loral, i. Anteorbitals. j. Postorbitals. k. Upper labials. 1. Lower 

 labials m. Temporals. — Fig. 3. Ventral view of the same head. n. 

 Mental, o. Anterior chin shields, p. Posterior chin shields, g. Ven- 

 trals. — Pig. 4. Skull of Natrix natrix. (Boulenger.) pm. Premaxil- 

 lary. m. Maxillary, n. Nasal, pi. Palatine bone. f. Frontal, ptf. 

 Postfrontal. p. Parietal, q. Quadrate, pg. Pterygoid, ar. Articular, d. 

 Dentary. Pfr. Prefrontal. Ca. Columella auris. ste. Supratemporal. — 

 Pig. 5. Skull of Crotalus. m. Maxillary, a. External pterygoid bone, 

 b. Internal pterygoid bone. c. Palatine bone. e. Lachrymal bone. f. 

 Pangs.— Fig. 6. Head of Pit Viper. Side view. n. Lower labials, o. 

 Upper labials, g. Loral, r. Nasal, no. Nostril, p. Pit. e. Eye. pr. 



