PISCES 



461 



he says, it presents f{ une certaine analogie avec le pretendu 

 Distoma clavatum." Dujardin himself was somewhat puzzled 

 by the resemblance in question. He does not appear to have 

 examined fresh specimens, yet he mentions the species as 

 tolerably common in the bonito, and occasionally present in the 

 tunny. At all events, it appears that the rightly so-called 

 Distoma clavatum is not unfrequently 

 taken from the ocean in the free 

 state. In concluding my notice of 

 this remarkable worm I can only add 

 that after examining numerous speci- 

 mens both in the fresh and preserved 

 states, I have formed the opinion that 

 the following specific names all refer 

 to one and the same parasite : 

 Distoma clavatum, Eudolphi ; D. cory- 

 phoentp, Rud. ; D. gigas, Nardo ; Fas- 

 ciola clavata, Menzies ; F. coryphcente, 

 Bosc ; F. coryph. hippuridis and F. 

 Scombri pelamidis, Tilesius ; F.fusca, 

 Bosc; Hirudinella marina, Garsin ; 

 H. clavata, Baird. In this list of syno- 

 nyms we may probably also include 

 Rudolphr 5 s Distoma tornatum. 



In addition to these distomes there 

 are numerous piscine flukes which 

 may fairly be relegated to other 

 genera. Thus, provisionally, I ele- 

 vated Dujardin's sub-genus Echino- 

 stoma into a separate genus ; and on 

 what I considered sufficient grounds 

 I established several other new genera 

 from amongst the more curious flukes 

 that had been described as infesting 

 fishes (Wedlia, Kollikeria). In the 

 genus Echinostoma the oral sucker is 

 either surrounded by a circle of little 

 spines, or it occupies the centre of a 

 disk, which is cleft at the ventral or 

 anterior aspect. In the latter case 

 the disk is either bordered both laterally and above by spines, 

 or there are two large lobed appendages, whose margins are 



FIG. 77. Echinostoma Mspidum. 

 Magnified. Original. 



