On Pterodina valvata. 29 



Just below tlie mastax are two pear-shaped glands (Fig. 1, /;, p) 

 on slender stalks attached to the oesophagus, and below these 

 half-a-dozen or more (Fig. 1, q) crowding round it just above the 

 stomach. 



The gastric glands (Fig. 1, g, g) are most singular in length 

 and shape, and are attached to the lorica at their larger ends. 



The foot is divided into two distinct parts : the upper transversely- 

 wrinkled and quite flexible, the lower stiff and smooth, reminding 

 me of a glass tube attached to an india-rubber one. 



The foot ends in a curious hemispherical cup, which is hned 

 with long cilia extending beyond its margin, and visibly in action 

 as the animal swims. I can conceive of no fimction that they can 

 perform, except that of keeping the cup free from extraneous matter 

 which might interfere with its power of adhesion. . 



The Figure 1 is that of a young female, and the ovary (Fig. 1, o) 

 in consequence has an insignificant appearance, whereas at a later 

 stage it frequently obscures a large portion of the other organs. 



The teeth are those of Melicerta, and the eyes similar to those 

 of Triarthra longiseta ; while the cihated head has the two parallel 

 rows of cilia (the upper coarse, the lower fine), with the groove 

 between leading to the mouth, which are to be seen in so many of 

 the larger rotifers. 



