275] PROTEOCEPHALIDAE—LA RUE 275 



defined as has also the new family Monticellidae. In this genus and 

 family probably belong Tetracotylus diesingii Monticelli, T. macrocoty- 

 lea Monticelli and Taenia malopteruri Fritsch. These three species are 

 all parasitic in the Siluridae. Perhaps Taenia osculata Goeze belongs 

 here also. It seems preferable, however, for the present to consider this 

 last as a species inquirenda in the genus Proteocephalus in which it has 

 long been considered to belong. More careful study into the morphology 

 of Taenia osculata is desirable in order that its systematic position may 

 be determined. 



MONTICELLIA MACROCOTYLEA (MonticeUi) 



[Fig. 125] 



1891 : Tetracotylus macrocotylea Monticelli 1891 

 1896: I chthyotaenia macrocotylea Riggenbach 1896:267 

 1911 : Monticellia macrocotylea La Rue 1911 :474 



This species was described by Monticelli (1891). Lack of sufficient 

 good material prevented a careful study of it. Riggenbach (1896:267) 

 listed this form in the genus Ichthyotaenia. La Rue (1911:474) in- 

 cluded this species in the genus Monticellia. Monticelli 's original de- 

 scription is here quoted: "TAENIA MACROCOTYLEA.— Questa 

 Taenia, che indico cosi dalle sue proeminenti ventose, ha molte rassomigli- 

 anze con le due seguenti, ma da entrambe si distingue per la caratteris- 

 tica forma del capo che e nettamente distinto dal collo e per il collo piu 

 breve. Le aperture genitali sono marginali irregolarmente alternanti. 

 Lo stato dell' individuo che posseggo non mi ha permesso uno studio piu 

 minuzioso di questa Taenia. ***** 



Habitat: intestino del Silurus megacephalus." 



Professor H. B. Ward very kindly secured Monticelli 's type slides 

 of this species for examination. As a result of this examination the 

 writer is able to add the following data to the original description. 



The head of this specimen is slightly crushed. In this condition it 

 measures 1.10 mm. broad, a figure which is probably too large by 0.10- 

 0.20 mm. Its length is about 0.90 mm. The suckers are prominent and 

 heavily muscled. They measure 0.45 to 0.50 mm. in diameter. The 

 sucker cavity could not be measured. The neck is about 0.50 mm. broad 

 just back of the head. Its length could not be ascertained for it was 

 broken off. Mature proglottids measure about 0.75 mm. square. No 

 young or ripe proglottids could be seen. The segmentation is distinct. 



The genital pore is marginal, irregularly alternating, and situated 

 in the first one-fourth of the proglottid. It is rendered prominent by a 



