Zoological Society. 



557 



" 1. Shciiii-noscd Crocodile {Crocodilus acutus). 

 Long- Diameter. Short Diameter. 



1333^^, 1-2286 Common size. 



1231 IC.0™™^^^ 1-2G66U . 



lonn I Extremes. 



1-2286 Average. 



M231 Average. 



" The average thickness of the discs was about jj^yLj^th of an inch. 

 " 'riie animal was young, and the blood was obtained from the 

 heart after death. 



•" 2. An Alligator fi-om South America (Chnmpsa fissipes, Natterer). 



Long Diameter. 



14551 



1333 I Common 



1200 ( sizes. 



II43J 



1600 1 



1000/ 



Extremes. 



Short Diameter. 



2666^ 



2400 I Common 



2286 r sizes. 



2000 J 



J^OOj Extremes. 



1-1259 Average. 1-2315 Average, 



" The animal was young and lively. The blood was obtained from 

 a prick of the foot. 



" Tlius, as is commonly the case in the oval blood corpuscles of the 

 vertebrate animals, in these two examples the long diameter is not 

 equal to twdce the short cUameter, and it may therefore be concluded 

 that M. Mandl's remarks on the blood corpuscles of the Crocodilidce 

 are not applicable to the corpuscles of all the species of this family. 

 So far, however, from doubting the accuracy of this physiologist's 

 observation on the blood of the Crocodilus Lucius, I am cUsposed to 

 regard the result of my observations, in connexion with the one which 

 he has made, as establishing a remarkable difference in the blood cor- 

 puscles of one family of Reptiles, similar to the peculiarity which I 

 have found in the red particles of the Linnsean genus Strix, as well 

 as in those of the Columbidce." 



A collection of Birds from Tangiers, presented to the Society by 

 G. W. H. Drummond Hay, Esq., was exhibited, and Mr. Hay fur- 

 nished the following list, accompanied with observations on the spe- 

 cies, which was read. 



Vultur fulvus , Linn. Arabic name, Nezer. 



" I shot this bird as he rose heavily from the top of a high rock, 

 near Cape Spartel, on the north coast of Africa, where he had been 

 gorging himself with the body of a dead kid. I'he species is rare in 

 these parts." 



Neophron Percnopterus, Sav. Arabic name, Erhama. " Common." 

 Aquila Chrysattos, Vigors. Arabic name. El Oukab. 



