124 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
SALMONIDiE. 
Genera. 
Pacific slope. 
Genera. 
Atlantic slope. 
Dorsal, i 
Anal. 
Dorsal. 
Anal. 
9 11 1 
13 17 
11 12 
10 
11 12 1 
10 12 
10 IH 
9 11 
9 11 1 
20 
11 
il j 
* Thymallus is probably an European elemeut in the Eastern fauna 
CYPRIXODOjSTTID^. 
This family of about fifty species is represented on the Pacific slope by but four 
species. Many of the forms are marine and only occasionally enter fresh water. To 
this class belongs the only species of Funclulus found on the Pacific slope. Leaving 
this out of consideration, we have CypHnodon. haneyi from the Pacific slope, with two 
more anal rays than any other Cypyinodon, but with two less than the highest number 
in Fundulus, and F inpetrichthys with anal rays erpial to the highest in the family: 
Genera. 
Pacitic slope. 
Genera. 
Atlantic slope. 
Dor.sal. 
Anal. 
Dorsal. 
Anal. 
Jorelanella 
I, 16-17 
I, 11-13 
10 
10 13 
10 12 
10 11 
13 
11 
10 17 
8 15 
Zygonectes 
7-1] 
8-U 
Lucania 
9-13 
9-11 
Gambnsia 
6-9 
7-11 
Mollienesia 
13 
7 
Poecilia 
7 
4 
7 
9 
7 
9 
Einpetrichtlij’s 
11-13 
13-15 
GASTEEOSTEIDiE. 
The species of those genera of Gasterosteidw having representatives on botli slopes 
are given in detail: 
Species. 
Pacific slope. 
Dorsal. 
Anal. 
Pygosteus bracliypoda. 
X. 1. 10 
1,10 
G. cataphractus 
III, 11-13 
I, 9 or 10 
G. inicrocephalus 
III, 11-13 
I, 9 
G. \villiamsoni 
iiir, 10 
I, 7 
Species. 
Atlantic s 
lope. 
Dorsal. 
Anal. 
Pygosteus pungitins .. 
VlltoIX-I, 9 
1,9 
Gasterosteiis aculeatus 
III, 11 to 13 
I, 9 or 10 
G. atkinsii 
III, 11 
I, 8 
G. wheatlan di 
III, 10-12 
I, 8 
G. dimid'atns 
III, 12 
I, 8 
Eucalia inconstans 
IV, 1-10 
1, 10 
Apeltes qnadracus 
III,I, 11 
I, 8 
In Pygosteus hrachypoda we have an increase of one spine over the maximum 
number in Atlantic specimens {Pygosteus pungitlMs). In the genus GasUrosttus no 
influence is evident except in G. tcilliainso^ii, in which there is an increase of one 
dorsal spine. 
