112 

 AIPYSURUS, LacepMe. 



Body not much compressed ; the ventrals are well deve- 

 loped, and have a sharp median keel. Head-shields gener- 

 ally divided; one pair of frontals; nasals contiguous. 

 Scales smooth, subcaudals broad, entire. 

 Belongs to the Polynesian fauna. 



A. ANGUiLLiEFORMis, Schmidt. 



Scales 17. Ventrals 142. Brown, with yellow cross- 

 bands. 



A. LiEvis, Lac^p. 



Scales 21. Ventrals 151-154. 



A. Fuscus, Tschudi. 



Scales 19. Ventrals 157-166. Brown. 



DISTEIRA, Lac4plde. 

 A pair of anterior frontals between the nasals. Scales 

 imbricate ; ventrals very small, with double keel. 



D. DOLIATA, Lacep. 



Scales 39-41. Ventrals 234. Brown cross-bands. 

 A solitary museum specimen. 



ACALYPTUS, R and B. 



Crown scaled ; a pair of frontals, nasals contiguous ; no 

 ventrals. 



A. suPEECiLiosus, B. and B. 

 Rare ; found in the Pacific. 



HYDROPHIS, DaudMi (sp.) 



Head short, shielded. One pair of frontals, nasals conti- 

 guous. Scales generally tubercular. Ventrals rudimentary 

 or absent. (They are said to be ' broad,' purely in a com- 

 parative sense.) 



