b. 
1. Squamation of Nape.—The following Table IX, is based on 100 speci- 
ETHEOSTOMA NIGRUM. 
mens from each of the lakes, and is intended to show the occurrence of scales on 
the nape in thisspecies. Eighty-five per cent. of the specimens from Turkey Lake 
have their nape naked, and none have their nape completely scaled. Compared 
with this, only 50 per cent. of the specimens from Tippecanoe Lake have a naked 
nape, while four per cent. have their nape completely scaled. 
TABLE IX. 
Turkey Lake aOR eee 
: : Lake. 
Per cent. of specimens having no scales on nape.. 85.00 50.00 
Per cent. of specimens having few scales on nape. 13.00 28.00 
Percent. of specimens havingseveral scales on nape 2.00 18.00 
Per cent. of specimens having nape thinly scaled .|.............. 2.00 
Per cent. of specimens having nape closely scaled.|...........:.. 2.00 
In Tables X, XL and XII are given the counts of the anal rays, dorsal spines 
and dorsal rays of Etheostoma nigrum from the two lakes. The counts are based 
on 100 specimens from Turkey Lake and 500 from Tippecanoe Lake. 
2. Anal Rays.—Table X. The anal rays vary from 7 to 11 in Tippecanoe 
Lake, 61.60 per cent. having nine rays. There is a tendency to vary toward an 
increased number of rays, 25.60 per cent. having 10, and but 11.20 per cent. eight. 
In Turkey Lake the variation is from eight to ten; 58 per cent. have nine, 40 per 
cent. have a smaller number of rays and only two per cent. a greater number. 
The mean number of anal rays is 9.15 for Tippecanoe Lake and 8.62 for Turkey 
Lake. 
TABLE X. 
pecans Turkey Lake. | 
Rericent, of specimensihavime) (Grama raye jets ieee eof & <ieeis'* wisi cued cle to te oselel= 
Per cent. of specimens having 7 anal rays ...... ORC OS trail ttart «ots jsvercton ote 
Per cent. of specimens having 8 anal rays ...... 11.20 40.00 
Per cent. of specimens having 9 anal rays ...... 61.60 98.00 
Per cent. of specimens having 10 anal rays ...... 25.60 2.00 
Per cent. of specimens having 11 anal rays ...... MOOR TE ara. cei ope arse 
Mean mum berioltraysien.. stystkice oa te a es 9.15 8.62 
