304 KAM.UilCHI KISHIXOUrK: 



The position of this oUique portion is either under the first dorsal or under 

 the second. In fishes of this family the lateral line often sends out many 

 biunches on both sides (figs. .31, .32, 35), and these branches are vertical in 

 Acanthocylimn, but obliqne in Ci/bivm. The perforated scales are larger, 

 thicker, and gi'eatly modified in their form, and they may also distinctly be 

 seen on the lateml keel of the caudal peduncle, at the treuchant edge. 



The lateral line of Ci/bium koreanum (fig. 35 ), C. (juttatum (fig. 61), Sarda 

 orientnlis (fig. 33), and Gymnosarda nuda (fig. 37), differ more or less from 

 the typical form. In Grammaiorcijni.is two lateral lines are found on each 

 side of the body (fig. 62). The upper lateral line seems to correspond to 

 the normal lateral line, nmning parallel to the dorsal median line of the 

 body. The lower lateral line joins the upper with a right angle behind the 

 pectoral, and running down backward approaches the ventral median line, a 

 little behind the venti-als. Thence the line ixms p:u'allel to the ventral 

 median line, and meats the upper lateral hue, a Httle anterior to the lateral 

 keel. 



In the Plecostei perforated scales are very httle modified, and the 

 undulation of the lateral line is not much pronounced ; but it has a more or 

 less characteristic featm-a in different famihes. It is woiihy of note that the 

 lateral line of the Thunuidse always takes a pecnhiU' course, above the pectoral 

 (figs. 43, 45-48). In this region the course of the lateral line is rather 

 diöicult to trace, as the pores are indistinct, few in number, and much 

 separated from each other. The lateral line of Tlmnrvm orierdalis is typical. 

 The lateral line of the Katsuwonidoe has only a slight rise above the pectoral, 

 and has small undulations at the cradal portion. Kluxzenger (49) vrcote in 

 the diagnosis of Thunnus tliunnina as follows : — 



" Die Seitenhnie bildet zuweilen eine Knickung nach oben über der 

 Mitte der Brustflosse ; dann senkt sie sich, et\va3 um-egelmüssig wellig laufend, 

 bis zur Mittelhnie." 



This description is well adapted to the lateral line of tunnies, but not 

 proper for that of bonitos. Indeed the author confoimded immature ;tuniiies 

 with bonitos, identifying Orcynus scMegeU of Steindachner (immature form 

 of ora common tunny) with Tliynnus tliunnina. 



