98 



MERISTIC \ AHIATION. 



[PART i. 



distinct! -Hii'i. It is difficult to speak with confidence as to the 



; from tli.- f.-nial.- alone, but by careful comparison I can find 



-tru.-tun- uhich ditT.-r.-ntiat.-s any of the remainder from the females 



1 Ult i, ,. : ;hein as all of the same species. A. .-ml inn. 



,,f many kind-, some being large salt lakes, while others were small 



pondi -T even pools. Th, -p. -iiic gravities of these waters varied from 1-030 to 



1 215, md jo am th>- r.--uit- ( the analysis of six samples, the composition of 



tl,, i.t. 'Hi- ipecific gravities were measured in the field 



with u hvdr.,in t. r nadii:/ to "i i:,, and on comparing these readings with the de- 



i,f tii.- ;-]'. I., "t' tti. -ami'les brought home it appears that they were 



t, and I think therefore tbat these rough readings are fairly 



trii-i-.\"ithy. As t.. th. c-..inii.--iti<'n of the waters not analyzed, nothing can be said 



with mi. alvses shew, some of these lakes contain chiefly 



,.(,!. -uli. hat. B, and so on. In a few (e.g. xxix) there is a great 



tir\ ..f -odium cari.onate. so much that the water was strongly alkaline and 



the hand-. Thi> can generally be recognized on the spot in various 



.vitsch's work is that of the caudal fins. 

 : ige between the large fins with some twenty 



n t.. tin- condition with no distinct lin or bristles. The following table 

 tin- niinihi r of bristles on the caudal fins, and this 



