!l| CLASS REPTILTA. 



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

 I/aud. 



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 ok 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 smalls shielded ; body covered ivith scales. Hydro- 



phis, Hydrus, Wagler. 



a. Abdomen with two rows of larger scales. 



Hydrus major, Sh Hyd. nigrocinctus, Men*, 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. 



h. Abdomen with two rows of larger scales united into a band. 



Hydrus Shawii, Hyd. major, 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. laevis, Mer. -^ — Hyd. 



Brugmansii, Boie. Hyd. atricapillus, Rein. 



B. Head large, depressed, dilated behind, shielded ; bod'j 



with square plates. Pelamis, Hydrophis, Wag. 



a. The central abdominal li^ie with a series of scales on each 



side. 



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



omatus. Gray, Mus. Brit. Pelamis gracilis, Hydrus gra- 



98 



