36 



s. GOTO. 



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

 of the hofly, while the other two are situated Ijehind it in a pair, so that 

 the three occupy the apices of an isosceles triangle, the hase of whicli is 

 perpendicular to the long axis of the hod y. 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 numher (5 — 7) of gohlet- 

 shaped hodies with a thin wall, and filled with numerous réfringent 

 o-ranules of a yelhjAvish cohuir, which do not stain at all in horax- 

 carmin and only shghtly in haematoxylin. It is, however, to he 

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

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

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

 7). I have not heen ahle to ohserve any nuclei in them; hut I helieve 

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

 fore, as an assemhlage of unicelluhu glands. 



These o-lands have heen ohserved hy previous writers, hut their 

 nature has heen variously misunderstood. Van Beneden and 

 Hesse,'^ for instance, descrihe them as haing " destiness à remplir les 

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

 as tactile organs. Parona and Perugia"'* are of the s:ime view, 

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

 V. Beneden ed Hesse." Non-, the hodies in question are not situated 

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

 their glandular iiature is, I helieve, evident from their structure ahove 

 descrihed. 



1). v. Boneden et Hesse— Recherches sur les Bdellocles et les Trematodes marins, 1863. p. 

 113. 



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

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



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

 di Genova, Ser. 2, Vol. X, 18'.)0. Estratto p. 1. 



