3g S. GOTO. 



anterior suckers. One of them lies in the median line near the apex 

 of the body, while the other two are situated behind it in a pair, so that 

 the three occupy the apices of an isosceles triangle, the base of which is 

 perpendicular to the long axis of the body. In some species, however, 

 they are nearly in the same straight line (Pis. I and II). In section, 

 each group is seen to consist of a limited number (5 — 7) of goblet- 

 shaped bodies with a thin wall, and filled with numerous refringent 

 granules of a yellowish colour, which do not stain at all in borax- 

 carmin and only slightly in haematoxylin. It is, however, to be 

 noted that their affinity for the latter dye varies according to dif- 

 ferent stages of secretory activity. The necks of the goblet-shaped 

 bodies of each group open together on the ventral side (PI. Ill, fig. 

 7). I have not been able to observe any nuclei in them; but I believe 

 they are to be regarded as highly modified cells, and each group, there- 

 fore, as an assemblage of unicellular glands. 



These glands have been observed by previojis writers, but their 

 nature has been variously misunderstood. Van Beneden and 

 Hesse,'^ for instance, describe them as being " destinies a remplir les 

 fonctions de machoires." Lorenz^^ on the other hand, considers them 

 as tactUe organs. Parona and Perugia'^ are of the same view, 

 "seguendo in questo il modo di pensare del Diesing e non quello di 

 V. Beneden ed Hesse." Now, the bodies in question are not situated 

 in the cavity of the mouth as v. Beneden and Hesse think, and 

 their glandular nature is, I believe, evident from their structure above 

 . described. 



1). V. Beneden et Hesse— Reclierches sur les Bdellodes et les Trematodes marins, 1863. p. 

 113. 



2). Lorenz— TJeber die Organisation der Gattungen Axine u. Microcotyle. Wiener 

 Arbeiten, Bd. I, Hft. 3, 1878. p. 24. 



3). Parona e Perugia — ^Res Ugustioae, XIV. — Annali del Museo Civico di Storia Naturale 

 di Geneva, Ser. 2, Vol. X, 1890. Estratto p. 4. 



