264 s. GOTO. 



in AVoocls Holl, Mass., my sincere thanks are due for affording 

 me the use of a table in the latter Laboratory. 



Phyllonella hippoglossi (O. F. Müller). 



This is the Epibdella hippoglossi of P. J. van Beneden and of 

 Monticelli. In his work of 1888, the latter author distinguishes 

 the present genus from Epibdella, but in his later paper ['91, 

 p. 125] he unites the two genera into one. According to my 

 own observations these two genera are very closely related to 

 each other, but they are distinguished by the fact that Epibdella 

 is provided with well developed anterior suckers with distinct 

 borders, while Phyllonella is destitute of any anterior sucker in 

 the true sense of the word, the anterior suckers being replaced 

 by a membranous projecting portion of the body, in which lie 

 innumerable unicellular glands (fig. 1). The figures of van 

 Beneden and Monticelli may perhaps lead one to infer that these 

 authors believed to have had before them true suckers with dis- 

 tinct borders ; but their descriptions clearly show that this was 

 not the case. Van Beneden says, " lis ont la forme d'un cous- 

 sinet ; il n'y a point de bord libre ni d'excavation au milieu ; 

 on ne distingue point de fibres rayon nées ou circulaires dans ses 

 parois, et c'est à peine si on peut même dire qu'ils forment 

 saillie. Ce sont des organes qui prennent leur développement 

 seulement dans d'autres Vers et qui sont ici dans un état rudimen- 

 taire " ['61, p. 22]. Monticelli also has recognized this fact 

 and proposed the name of *' pseudoventose " for the organs in 

 question ['91, p. 106]. We can, however, scarcely speak of the 

 '' organs " (in the plural), since the glands above referred to 

 are present on the dorsal side uniformly in all parts of the 

 membranous portion (fig. 2), and their segregation in two 



