PISCES * 477 



particularly numerous they not unfrequently prove fatal to the 

 unsuspecting Gammari. After their transference to the intestine 

 of the ultimate host a period of about one week more is required 

 for the completion of their development. 



From the large number of species of Echinorhynchi infesting 

 our fresh-water fishes, they present quite a feature of piscine 

 parasitism. Almost every perch, chub, carp, pike, barbel, bream, 

 or roach that one opens is found to have its intestines occupied 

 by parasites which exhibit a light yellow color. These are 

 Echinorhynchi, the common forms being E. proteus, E. angus- 

 tatus (Fig. 84, No. 1), E. clavceceps, E. globulosus, and E. 

 tuberosus. In the Salmonidae, besides several of the above, we 

 may also find E. clavula, E. fusiformis, and E. pachysomus. As 

 a group these parasites are more attractive looking than most 

 other helminths, and they will well repay the zoological collector. 

 The species infesting marine fishes are almost as numerous as 

 those found in fresh-water hosts. 



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