Sasaki: 0.\ Tiki: fron! Sakhalin am> Lucius reidiertii (Dyijowski) 55 



available for my dissection, showed this same charactcrislic, though tlierc 

 might be discerned in some measure an individual \-ariation as to the de- 

 velopment of the parietals in respect to other bones of the vicinity. The 

 J)arietals, developing extensively over the epiotics and supraoccipitnl, form contact 

 with each other along the sagittal line of the head so that in the upper 

 surface of the slcull the frontals are quite separated from the supraoccipital. 

 The epiotics, which appear in the upper surface of the skull in L. Indus, are 

 in the specimens examined, almost hidden under the parietals and can only 

 be seen in the posterior surface. 



The colciration and patterns of the body are very characteristic, no less 

 than the osteology referred to. The back tif the bod}- and head is deep gray 

 or grayish blue. The sides shine with .silver)- lustre, shadetl in light green 

 or greenish blue. Tlic belly is pearly white. Closely resembling the .spotted 

 niuskellunge L. masqninotigy (Mitchill) of North America, the head and body 

 have many roundish or ov-al dark spots smaller than eyes, measuring from 

 abouti 6 mm. to about tj mm. in diameter in the largest of the Sakhalin 

 specimens examined, a characteristic which makes the form decidedly distinct 

 from L. lucius \\-hich may have whitish spots on the darker ground colour. 

 As painted out by Dybowski the spots arrange themselves in more or less 

 obliquel)- transvers lines, which all told for both the head and body, number 

 roughly 30-3;. The regularity is, however, present to individual variation; 

 the one given in the te.xt figure i is an example which has the extremely 

 irregular arrangement of the spots. Except this respect the characteri.stic is 

 quite constant, similarly occurring in all graduated sizes of specimens ; this is 

 also proved by the reports of the inhabitants in Taraika. 



Anatomical characteristics of other internal organs were also examined but 

 no marked point discriminative from other known pikes has been discovered. 

 The dimensions of the specimens examined are as follows. 



