THE FISHES OF GEORGIAN BAY ■ 37 



SESSIONAL PAPER No. 39b 



tail. Depth 4 to 5, in one specimen 3 • 7. Head 3 -3 to 3 -S. Mouth very oblique, 

 its aperture almost dorsal. Dorsal fin with 5 spines as a rule, but sometimes 

 with 4 or 6, followed by 10, sometimes 9 or 11, soft rays. Anal fin with 1 free 

 spine and 10, sometimes 9 soft rays. Ventral fins placed far forwards, with 1 

 spine and 1 soft ray. Between their free portions the fused pubic bones form a 

 projecting median ridge. Body without scales or surface plates. Coloration 

 dark olivaceous, with minute rounded clear markings on a darker ground. 



Family percopsid^. 



(Trout-perches) 



Percopsis guttatus, Agassiz. 



(Trout-perch) 



This species is one of two representing the peculiar family PercopsidoB , fishes 

 which combine the characters of the perches and salmonoids. It is reported 

 by Jordan and Evermann ('96) as abundant in the Great Lakes. The type was 

 described by Agassiz ('50) from specimens taken in Lake Superior, and specimens 

 are reported by Bean ('81) from Hudson Bay. The species is also reported from 

 Hawkstone, Lake Simcoe, by Meek and Clark ('02), but not from Muskoka Lake. 

 Considerable interest attaches to the species in that only a single specimen has 

 appeared in the Go Home Bay collections, this having been found floating on the 

 surface of the water. The fish inhabits deep cold water, and may be plentiful, 

 but up to the present has not been taken in small-meshed nets, set especially for 

 the purpose. The following description is based on the single . specimen taken. 



Length 3| inches. Depth 4-8. Head 3*4. Mouth slightly inferior, other- 

 wise normal. Scales 6, 56, 8. Edges of the scales with minute teeth. Dorsal 

 fin with 2 hard rays, the first rudimentary, and 9 soft rays. Anal with 1 hard 

 and 6 soft rays. A small adipose fin between the dorsal and the caudal. General 

 coloration pale, the dorsal parts with dark edges on the scales and more or less 

 definite mottlings about the dorsal fin. 



Family atherinid^. 



(Silversides) 



Labidesthes sicculus, Cope. 



(Brook-silverside) 



(Plate II, fig. 15) 



Commonly represented by at least a few specimens in most seinings from 

 shore swamps. It shows a preference for localities where, in addition to aquatic 

 vegetation, there is a considerable amount of clear sand. The largest number 

 of specimens have been taken in the running water near the falls of the Go Home 



