KUKGL. SV. VET. AKADEMIENS HANDLINGAR. HAND 47. NIO 6. .". 



To begin with the Crocodiles of Guaso Nyiri appeared to me to d ii for from the 

 true G. niloticus, but a closer examination failed to reveal any distinguishing constant 

 characteristica in the arrangement of the shields. All my specimens have four in- 

 teriör nuchals arranged 2 + 2. The posterior nuchals form an anterior rovv of four, 

 and behind that there is a pair of shields. The lateral ones in the anterior row 

 are smaller than the median but usually situated in the same transverse row, not 

 wedged in between between the anterior and posterior series which appears to be the 

 usual thing in specimens from the Nile. One of the specimens had an extra pos- 

 terior nuchal behind the others, thus 4 in the first, behind them 2, and finally a 

 single one (conf. fig. 1 b). 



The dorsal scutes are also somewhat irregular. The first transverse series con- 

 tains usually 4 scutes, but sometimes already the first contains 6 scutes. Behind the 



Fig. 1. a Arrangement of nuchal scutes in Crocodiles from Guaso Nyiri. 

 b A somewhat aberrant pattern of the same. 



first transverse series 10 to 12 series follow with 6 scutes each. Then the number is 

 diminished again so that behind the series with six scutes the arrangement is for in- 

 stance, in one specimen four series with 4 scutes each, in another, first two series 

 with 5 each, and then three with 4 each, and in a third specimen five series with 4 

 scutes each. About 16 or 17 series of scutes may be termed dorsal, including the 

 pelvic series with 4 scutes. 



The caudal series begin with some which contain an increased number of scutes, 

 often three transverse series with 6 scutes each, but in one instance first two series 

 with 5 and then two series with 6 each. Behind these each series on the anterior 

 portion of the tail contains 4 scutes. 



The dental formula of four specimens is as follows 



18 + 17 



16 + 16 ; 



B. 



18+ 18. 

 15+ 15 ; 



C. 



19 + 18 

 15 + 15 ; 



D. 



17 + 17 

 15 + 15' 



