Cope.] ^^^ [May 18, 



Leptognathinfe. I propose this snbfemily as distinct from the Xenodon- 

 tinse, on account of the presence of a large tracheal lung which is con- 

 tinuous with the normal lung, and with the trachea, and extends to the 

 throat. Leptognathus nebulatus\j.; L. garmanii Cope. 



Scytalinse. Tachymenis strigatus Gthr. ; Phalotris lemniscatu» D. and 13. ; 

 P. tricolor D. and B.; Erythrolamprus bipunctatus Gthr. 



Natricinoe. Cerberus bocpformis ; Pseudanpis cana li. 



AcrocJiordidw. 



Chersydrus grantdatas Merr. In this species the heart is at the middle 

 of the length of the body, and the normal lung is posterior to it, extending 

 nearly to the vent. No rndimental lung. A tracheal lung, composed of 

 coarse cells and without lumen, extends from the heart to the head, and 

 is discontinuous with the true lung. The trachea is closed, but communi- 

 cates with the tracheal lung by a series of symmetrical pores on each sides 



Najidm. 



One lung and a rudiment ; no tracheal lung. Pseiidechis porphyriacvs 

 Shaw ; Diemenia reticulata Gray ; Naja tripkhans L.; Bungarus gemi- 

 fasciatus Kuhl. 



Elapidcp. 



No rudimental nor tracheal lung. Elaps lemniscattis L. ; E. fuUius L. ; 

 E. corallinus L. ; E. multifasciatus Jan. 



nydropMdm. 



I. One lung and no rudiment, continuous with tracheal lung, which 

 extends to head. 



Hydroplm liardwickii Gray (a slight constriction between tracheal and 

 posttracheal lungs) ; H. elliotii Gthr. ; Hydrus bicolor Daud. 



II. A rudimental right lung connected with the left lung, which is 

 separate from the large tracheal lung. 



Platurus laticaudattis L. 



SOLENOGLYPHA. 

 A tracheal lung, continuous with the normal lung. 



Causidce. 

 No rudimental lung. 

 Causus rhombeutus Licht. 



Dendraspididce. 



No rudimental lung. 

 Den draspiH poly lepia Gthr. 



