peculiarities of the infection of the naackerel correspond to those of the 

 herring parasite, and the life cycles of all three species are actually very 

 close. We cannot fail to notice, also, the systematic proximity of both 

 genera of monogenetic trematodes. 



Fig. 124. Qctostoma sp. sp. from the gills of Pneumatophc rus japonicus 



(Houtt. ) from the region Yablochnoii (southern Sakhalin, Se i of JaoanX 



A- -Armature of the copulatory organ of O. minor (Goto); I. --Middle 



hooks of the attaching disc of O. minor (Goto); G--Armatur2 of th^ copulatory 



organ of O. scombri Kuhn; D- -Middle hooks of the attachii g disc of O. 



scombri Kuhn. 



Interesting observations on the life cycles oi Microcot\ le gotoi 

 Yamaguti were successfully conducted during works on Southern Sakhalin 

 in 1946 and continued in 1949 on the Island of Shikotan. M. gctoi parasitized 

 natural marine fishes of the genus Hexag rammos , mainly nn _H. oct ogrammus 

 (Pallas) in Southern Sakhalin and on H. lagocephalus (Pallas) near t ae Island 

 of Shikotan. In our opinion, the data on the biology of these fishes i re still 

 insufficient, and because of that we should first show the materials vhich 

 we have on the life cycle of M. gotoi a nd attempt to compare them w th infor- 

 mation availa.ble about the Terpug (rock, trout, starling, nobis). 



p. 118 



123 



