CLASS REPTILIA. 



scales ; muzzle shielded, tail short. Eryx and Clothonia, 

 Da^id. 



Eryx jaculus and E. turcica, Daud. Boa Tartarica, Lich. 



but Cuvier states that this is without spurs. Eryx angui- 



formis. Boa anguiformis, Schn. Eryx Indica, Cuv. 



Hydrus, Water or Sea Snakes. 



Ventral shields narrow, formed of two united scales ; body 

 compressed ; anal spurs none ; tail compressed, except in 

 Achrocordus ; nostrils vertical operculated. 



A. Head small, shielded ; body covered with scales. Hydro- 



phis, Hydrus, Wagler. 

 a. Abdomen with two rows of larger scales. 

 Hydrus major, Sh — — Hyd. nigrocinctus, Merr. from 



Russel, t. 6. Anguis Xiphura, Herm. Hyd. chloris, Mer. 



Russel, t. 7- Hyd. obscurus, Merr. Russel, t. 8. Leio- 



seloma obscura. Var. a. Fitz. Hyd. schistosus, Mer. from 



Russel, t. 10. Hyd. cyanocinatus, Mer. from Russel. 



b. Abdomen with two rows of larger scales imited into a band. 



Hydrus Shawii, Hyd. jmajor, var. Sh. MSS, Hyd. 



coerulescens, Sh. Mus. Brit.- Hyd. leiolepis. Gray. 



Hyd. lanceolatus. Gray. Mus. Brit. Hyd. spiralis, Shaw. 



Hyd. doliatus, Mer. Distera, Lacep. Pelamis, Wag. 



Hyd. striatus, Mer. Hyd. Isevis, Mer. Hyd. 



Brugmansii, Boie. Hyd. atricapillus. Rein. 



B. Head large, depressed, dilated behind, shielded ; body 



with square plates. Pelamis, Hydrophis, Wag. 



a. The central abdominal line with a series of scales on each 



side. 



Pelamis bicolor, Daud. Hyd. platura, Lin.- Pelamis 



ornatus. Gray, Mus. Brit.— —Pelamis gracilis, Hydrus gra- 

 98 



