234: 
The dorsal fin has one spine-like ray, eight rays, the last one of which 
is double, and one very small or rudimentary ray before the spine. The 
variation from this is very small indeed. Of the 536 specimens from Tur- 
key Lake, 97 per cent. have this number of rays, which may be designated 
thus: II 84, the “II” standing for the rudimentary ray and spine, the “8” 
for the eight rays, and the “1%” for the double of the last ray. The aver- 
age number of rays is 8.0037. The table shows the results obtained. 
DORSAL FIN. 
No. of Rays. No. of Specimens. No. of Rays. No. of Specimens. 
TS ie ea i Ae ees: 519 DOM sitet A Ca Eel. ee 1 
LUBY ee ene See ee TS aad RR DR ec 4 TOR: oc neds aaeathye acer tase ee sail 
Ve aed eet eee, hate ee ee eerennts. 9 II6 1 
1 HL Ys yap ey Woe Ore Os Dk a eg 1 
It will be seen from the table that over one-half of those that vary 
from II 8% are different only in the absence of the very small rudimentary 
ray. This is so small and lies so close to the base of the spine that it 
cannot be seen unless especially looked for. Only five specimens have 
nine full rays, one with seven and one with six, making in all but six 
specimens that have a variation of one full ray, and one a variation of 
two rays from II 8%. : ‘ 
The variation in the anal fin is a little more than in the dorsal, 92.91 
per cent. have II 74% rays. The anal fin has one less ray than the dorsal, 
and the average for the whole is 7.0037. The greater per cent. of varia- 
tion in this fin is due to the absence of the rudimentary ray. Only four 
specimens have one complete ray more, and two one less than II74%4 The 
table shows the results obtained. 
ANAL FIN. 
No.of Rays. ees No. of Specimens. No.of Rays. No. of Specimens. 
Pas. cadsiad os wee War dev ness aA ee ad 498 Gate sce rc ensa cas hare, SoG.s cies bee 
TOTO ieee ane s.r grains wd oie nies /iacea TAPES CT eee WSGOG 4.22 oties-2 Pascov ihe tiecceteateat ie crs tee ab 
1 fe aes Seta aeeahe Rie pr PA SS git Ry Oe 30 MBG ees) eae Bika Suet tcc ae ee 1 
UG Wah ated eas ceed a cee 2 
The following table shows the dorsal and anal fins, together with the 
number of specimens that each combination contains. It will be seen 
from this table that there are but three specimens in which there is a 
variation from the prevailing number in both the dorsal and anal fins. 
Each of these has the small rudimentary ray absent, and one specimen 
has one complete fay more than the prevailing number. It seems that 
