PARKER: OPTIC CHIASMA IN TELEOSTS. 225 
therefore, be adopted here. I shall begin with a consideration of the 
soles. 
The Soleidae, according to Jordan and Evermann (’96-00, p. 2692), 
may be divided into three subfamilies: the Achirinae, or American 
soles; the Soleinae, or European soles; and the Cynoglossinae, or 
tongue fishes. The Achirinae and Soleinae have their eyes on the night 
side, that is, they are dextral ; the Cynoglossinae are sinistral. I have had 
the opportunity of studying representatives of all three subfamilies, 
and the positions of their optic nerves at the chiasmata are given in 
Table II. : 
TABLE II. 
Famity SoLEmAE (Soxgs). By toe , yee 
Subfamily Achirinae (American Soles). 
Species dextral. 
1 Achirus lineatus (Linnaeus). Tampa Bay, Fla. 
1Achirus fasciatus Lacépede. Wareham River, 
Mass. 
Subfamily Soleinae (European Soles). 
Species dextral. 
2Solea solea (Linnaeus). Mersey River, Eng. 
. Plymouth, Eng. 
Subfamily Cynoglossinae (Tongue Fishes). 
Species sinistral. 
2Symphurus plagusia (Bloch et Schneider). Rio 
Janeiro. 
1Symphurus plagiusa (Linnaeus). Tampa Bay,Fla. 
Of the American soles two species were examined, Achirus lineatus 
and A. fasciatus. All specimens were dextral, as is typical for this sub- 
family, and in both species individuals with the left nerve dorsal, and. 
others with the right nerve dorsal were found. The numbers given in 
the Table indicate an approximate equality in the occurrence of these 
1 Material supplied by the United States Commission of Fish and Fisheries. 
2 Material from the collections of the Museum of Comparative Zoology. 
