24 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



The species N. muskoka is described by Meek as differing from N. cayuga in 

 the reduced size of the scales before the dorsal j&n, more slender body, less blunt 

 snout, slightly larger and more oblique mouth, and more incomplete lateral line. 

 Georgian Bay specimens cover the range of depth variation as described by Forbes 

 and Richardson ('08) for N. cayuga (4.5 to 5.2), but 5 specimens of N. cayuga in 

 the British Museum collection (Silver Lake, Iowa, Meek), which have been recently 

 examined, are much deeper (4 to 4.3), and their appearance is quite different both 

 from the Georgian Bay specimens and from specimens of N. muskoka. Georgian 

 Bay specimens commonly show 15 rows of scales before the dorsal fin, but the num- 

 ber is occasionally 16, and in some specimens two or three extra scales are inserted 

 between rows. The crowded appearance is, however, not nearly so marked as in 

 N. muskoka. The lateral line characters seem to be quite variable, some specimens 

 having the lateral line almost complete, and other showing pores only on a few 

 scales. It appears that the Georgian Bay specimens deviate in some characters 

 from the typical N. cayuga, and that these characters are accentuated in the in- 

 land form. The species described by Eigenmann ('93) as N. heterolepis, from a 

 single specimen taken at Qu'appelle, is, as suggested by Forbes and Richardson, 

 referable to A^. cayuga. The specimen is superficially much more like N. cayuga 

 than are those from Georgian Bay or Muskoka Lake. 



Notropis heterodon, Cope. 



(Plate II, fig. 10) 



A small species, in fact the smallest of all fishes inhabiting the region, the largest 

 specimens being barely 1^ inches in length. It appears in collections from Go 

 Home Bay, but probably does not occur in any numbers along the main shore. 

 It is very abundant inland, however, a large number having been taken from Flat 

 Rock Lake, where small specimens have been seen in millions. On account of its 

 very small size and superficial resemblance to Pimephales notatus, which is abun- 

 dant in the same situations, this species easily escapes detection. It is recogni- 

 zable by a numberof features, including a solid black lateral stripe, oblique mouth, 

 black chin, and the small number of scales in front of the dorsal fin. 



Length 1 ^ inches, commonly less than 1 inch. Body slender, slightly compressed 

 Depth, 4.5 to 5. Color olivaceous, the scales above with prominent dark 

 edges. Sides with a solid black longitudinal stripe, accentuated by overlaid specks, 

 the anterior ones rather fainter and placed at a lower level. The stripe is continued 

 aiound the head and tips the chin. Between the lateral stripe and the back there 

 is a clear band in which the scales are not dark-edged. Head 3.4 to 4 in length 

 of body. Mouth terminal ^ oblique. Dorsal fin with 8 rays ; anal with 8 or sometimes 

 7. Scales 5, 37 or 38,3. Oblique rows before dorsal 15, sometimes 14. Lateral line 

 developed only in front, with pores on a few s(;ales. 



