Hydatinaea.'] the INFUSORIA. 375 



which they are colourless. In all the species, except 

 D. marinum, the eyes are situated behind the head of the 

 oesophagus, but in that they are anterior, but below the 

 rotatory organ. The eggs are never attached to the parent, 

 nor are they developed in large masses. 



639. DiSTEMMA forjicula. The pincer-J'oot Distemma. 

 — Body cylindrico-conical ; eyes red ; toes thick, recurved, 

 and dentated at the base. The eyes are placed at the end 

 of a long cylindrical nervous ganglion, and the rotatory 

 organ consists of four parts. Fig. 411 is a side (left) view, 

 and Jig. 410 shews the jaws extended for seizing its prey. 

 Length l-120th. 



640. Distemma setigerum. The bristle-footed Dis- 

 temma. — Body ovato-oblong; eyes red; toes setaceous and 

 decurved. Length 1-2 16th. 



641. Distemma ( ?) marinum. The sea Distemma. — 

 Body ovato-conical ; eyes red, close together ; foot long ; 

 toes thick, the length of the foot; jaws many-toothed. 

 Found in sea water. Length 1-1 44th. 



642. Distemma ( ?) Jorcipatum. The colourless Dis- 

 temma. — Body ovato-oblong; eyes colourless ; foot short, 

 with stout toes. If the two colourless vesicles are not eyes it 

 must be placed in the genus Pleurotrocha. Length l-288th. 



Genus CLXII. Triopthalmus. The row-eyed Rota- 

 tory Animalcule has three cervical eyes, which are sessile, 

 and are all arranged in a row, and a forked foot. The 

 rotatory organ is compound. It has a large oesophagal 

 head, with two (single toothed?) jaws, a long thin oeso- 

 phagus, a globose stomach-like protuberance, with two 

 oval glands, and thin posterior alimentary canal; two 

 muscles move the foot. 



