NATURAL SCIENCES OF PHILADELPHIA. 



341 



28. C. arietans Gray. 



One spec. Senegambia, John Cassia, Esq. 



One " Cape of Good Hope, Garden of Plants. 



One " " " U. S. Exp. Expedition. 



This is the type of Bitis Gray, in which the supranasal is not developed into 

 a horn. Corneous and squamous appendages are, however, common among the 

 vipers, and occur independently of generic characters. The position of the 

 nostrils and the number of nasal plates are the same in this and the last 

 species. 



Echidna (Merrem, 1820) is employed by some authors to designate this 

 genus, but as its type, E. cobra, (Merrem, Systema Amphib. p. 150), cannot 

 be identiiied,* Dr. Gray adopts Clotho (Wagler.) 



Toxicoa Gray. 

 Cat. Brit. Mus. 1849. (Type Echis arenicola Boie.) 



29. T. s qu a m ig e r a nob. Echis squamigera Hallow., Proc. Acad. Nat. Sci. 

 Phila. vii. p. 193. 



One sp. Gaboon. M. Duchaillu. 



Tox. chloroechis ( Viper a chloroechis Schlegel, Verslag. der Koniglije 

 Akad. Amsterdam, iii., p. 317, 1855) is allied to this species, bat differs in 

 having 23 rows of scales instead of 18 ; 13 inferior labials instead of 10; and 

 in having "on each side of the back one row of small spots of a light yellow 

 color," instead of irregular transverse fascia? of the same. 



Vipera Laurenti. 

 Specimen Synopsis Rept. 99. 



3.0. V. ammodytes Daudin. 



One spec. Italy. Dr. Wilson. 



Si. V. as pi s Merr. 



Thirteen spec. 

 Var. oeellata Bp. 



Five spec. 

 .Var. r u f a Bp. 



Three spec. 

 Var. f u s c a Bp. 



Three spec. 

 Var. nigra Bp. 



Two spec. 



Syst. Rept. 148. 



32. P. b e r u s Merr. 

 One specimen. 



Italy. 

 Italy. 



Dr. Wilson. 



Pklias Merr. 



Four 



Three 



Two 



Garden of Plants. 

 Dr. Wilson. 

 J. & H. Rinberg. 

 Dr. Wilson. 



Loc. ignot. 

 Italy. 

 Lund, Sweden, 

 (young.) Italy. 



A half grown specimen, from Italy, has the short muzzle of the variety 

 Ursinii Bp., with the ordinary dark coloring, 



Var. n i ger Bell. {(J 1 ) 



Two spec. Lund, Sweden. J. & H. Kfnberg. 



Var. dorsal is. (P. dorsalis, Gray. Zool. Misc.. p. 71.) 



One spec. Lund, Sweden. J. & H. Rinberg. 



Our specimen is not typical of the variety, as the dorsal band which is 

 mght scales wide is undulate on the margin, thus approaching the ordinary 

 variety. The muzzle and gape is shorter than usual, thus resembling Ursinii. 



* His description, " Squamis maioribvs in carina dorxi," iv, at least, not applicable to 

 any of the true vipers. 



