96 ILLINOIS BIOLOGICAL MONOGRAPHS [96 



234-5) compiled a description of Taenia percae from Miiller's (1780) 

 description. 



Miiller (1788:5) gave a description and diagnosis together with 

 drawings of this species. The latter have been faithfully redrawn and 

 are reproduced (Figs. 121, 122, 172, 173). These are of value for com- 

 parative purposes while the description which is here quoted is suf- 

 ficiently detailed to permit its comparison with later descriptions. His 

 diagnosis and synonymy are omitted. 



"Caput, seu extremitas antica et tenuior insequentium articulorum latitudine, 

 obtusum supra bulbis binis sphaericis, ocularibus, pellucentibus, subtus binis simili- 

 bus obsoletis infra marginem instructum. Articuli corporis crassiores et planiores 

 quam in congeneribus figuram quadrangulam imitantur. In ipso corpore linea 

 longitudinalis Candida utrinque conspicitur ; haec propius inspecta e lineolis 

 articulorum arcuatis quavis intersectione interruptis componitur. In ipsis intersec- 

 tionibus porus seu osculum solitum passim conspicitur, ac marginis medio in altera 

 paginae parts, non in opposita, linea transversa alba ad medium paginae pertingens 

 pellucet. Haec foramini in ipsissima ora laterali quorundam articulorum conspicuo 

 ac ad medium usque pertuso deberi videtur. Foramen hoc canaliculatum oviductus 

 est ac in paucis Taeniae speciebus observatur. 



"In paene exsiccato capitulo quatuor circuli bulborum vestigia apparuere ; 

 posteriores puncto opaco impressi erant. 



"In intestinis Percae marinae raro; ultra viginti enim diversa aetate examini 

 subieci, in duabus tantum Martio et Aprili, unicam nempe in altera, in altera 

 tres reperi. 



"Quas claris. GOEZE in Siluro reperit, sola absentia lineolarum lateralium 

 non in omnibus aeque visibilium differre videtur." 



Miiller in his synonymy gave Taenia alternation transverse lineata 

 Goeze, a parasite of Silurus glanis, as a synonym of Taenia percae. 

 This was followed by Gmelin (1790:3079) who also considered Goeze 's 

 species to be the same as Taenia percae. Schrank (1788:48) in his 

 catalogue gave a diagnosis of Taenia percae and listed the perch as the 

 host. Rudolphi (1802a-112-13) diagnosed and described this species, 

 naming it Taenia ocellata. He recognized that his species and Miiller's 

 Taenia percae, exclusive of the variety /3, were synonymous. His 

 description is here quoted verbatim : 



"Taenia ocellata : capite obtuso, osculis orbicular ibus excavatis ; corpore plan- 

 iusculo, articulis subquadrangulis. 



"Taenia percae Syst. Nat. p. 3079. n. 77. (exclusa var. 3.) 

 "Zwei bis fiinf Zoll lang. Der Kopf rundlich, der Gestalt nach alle Augen- 

 blicke verschieden, bald aufgeblasen, bald zusammengezogen u. s. w. Nach vorne 

 stehen am Kopf vier kleine aber tiefe Saugblasen, wie Napfschen, an denen ich 

 keinen Rand, wie bei der vorigen Art, wahrgenommen habe ; sonst sind sie eben 

 so veranderlich. Der Hals ist dunn und schwach runzlich, die auf ihn folgenden 

 Glieder werden allmahlich grosser und grosser, so dass die Starksten derselben fast 



