Parasites of marine and, more rarely, fresh water Teleostei. 

 They are encountered mainly on Perciformes. In separate cases they are 

 known from parasitic Isopoda. 



This order is subdivided into Mazocraeinea Bychowsky, subord. 

 nov. and Discocotylinea Bychowsky, subord. nov. 



As a whole the order corresponds to the superfamily Dicliphoroidea p_ ^^j 

 of Price ( = Dactylocotyloidea Brinkmann); however, it is not possible to 

 utilize the present name (Price's name, nobis) because the family 

 Diclidophoridea is aberrant in a number of connections and it would be 

 incorrect to attribute type significance to it. 



The division of the order into 2 suborders is based on a principal 

 distinction in the method of fornning the supporting skeleton of the clamps, 

 to which we attribute a leading significance in the evolution of the present 

 group of Oligonchoinea (see also Sproston, 1945b). It is quite probable that 

 during subsequent studies it will be necessary to introduce an even larger 

 number of basic subdivisions, but within the limits of both principal lines of 

 development. 



1. Suborder Mazocraeinea Bychowsky subord. nov. 



Mazocraeidea, of middle and large sizes. The attaching armature 

 of the adult individual consists of 4 pairs of clamps, one pair of edge hooks 

 (always?) and Z pairs of middle hooks. The clamps usually are of the same 

 size, all with a complete chitinous capsule consisting of a number of separate 

 parts or of a different size and a more or less reduced capsule. As an 

 exception the number of clamps can be less than 8. The intestinal tract 

 either has 2 clearly expressed trunks merging at the end and producing 

 numerous lateral and internal outgrowths or it forms a net-shaped inter- 

 lacing almost without traces of basic trunks. 



Parasites of marine and transitory (anadromous or catadromous 

 species, nobis) fishes - -Clupeiforines and Perciformes, on the latter they 

 are known basically from Scombroidei. 



This suborder consists of two families --Mazocraeidae Price 

 and Hexostomatidae Price. 



I. Family Mazocraeidae Price, 1936 



(Figs. 24, 25, 32, D, G. 41, 84, 113, B, 123, 

 124, 222-225, 263, 297, 298) 



499 



