242 
ON THE GEOORAPHICAL 
Corals, Herpetodryas Boddaertii, Dendrophis aurata,Dryio- 
phis Catesbyi, and D. argentea, Homalopsis plicatilis, Elaps 
lemniscatus, and E. Surinamensis, &c., which have been 
observed in the Guyanas, where the following natives of 
Brazil are wholly wanting : Calamaria Blnmii, Coronella 
Merremii, Xenodon Schotii, and X. rhinostoma, Lycodon 
formosus, Herpetodryas serra, Homalopsis carinicanda, and 
H. Martii, &c. Others appear to be represented in those 
two points of Sonth America, so that we may place the 
Coronella vennstissima, Dipsas Mikani, D. Wiegeli, I), 
leucocepliala, and D. Xattereri, with the Trigonocephalus 
Jacaraca, all of Brazil, in parallels with the Coronella ve- 
nusta, Dipsas nebulata, D. Catesbyi, D. macrorhina, D. 
punctatissima, and the Trigonocephalus atrox of the Guy- 
anas. The other parts of South America are too little 
known to enable us to establish a comparison between the 
reptiles of the different countries of that continent ; it is 
however, proper to remark, that there have been discovered 
in Chile several new serpents, which do not appear to exist 
on the other side of the Cordilleras. 
I must conclude this review of the geographical distri- 
bution of serpents, fearing that I have already abused the 
patience of the reader, by entering into details which I 
might have here omitted, and which I purpose to treat of 
more at large in another work, which has occupied me for 
a long time past. 
In conclusion, I regret not to be able to add, as a sequel 
to this book, some observations on Fossil Serpents. To 
this time we have not discovered more than the remains of 
a very small number and these remains, confined almost 
wholly to a few vertebrae, often accompanied by ribs, or 
at most to some isolated fragments of the cranium, are 
too incomplete to serve for the exact determination of the 
genera, or the families to which these beings have pertained. 
The few observations made on fossil serpents appear, in- 
^ Consult the labours of Morren ; also of Crvier, Ossem. Fossil., iy, 
p. 180, and v. p. 2, p. 168 ; Ooldfuss, Nova Acta, xv. p. 1, pi. 3, fig. 8. 
&c. 
