ON FURTHER OBSERVATIONS ON MALE ROTIFERS. 509 



were noticed at the bottom of the trough. They were dark in 

 colour, granular, and covered with short blunt spines. 

 Size, yloth inch (= 141 /x). 



Anuraea brevispina Gosse S, Fig. 2. 



The shape of this minute rotifer is inclined to be truncate, but 

 globular, not so broad as it is long, and the body, unlike that of 

 the female, in a foot, ends usually somewhat pendant. 



Head, stout, with a chitinous covering on the dorsal side, well 

 marked in lateral view ; this folds up and encloses the head 

 when the animal retracts the cilia. There is a deep constriction 

 at the neck. 



Body, enclosed in a carapace which has openings on the 

 dorsum and sides, so that it appears to be enclosed in three 

 more or less arched plates ; in the specimens seen there was a 

 conspicuous oil globule. 



The foot has a chitinous sheath, down which the passage from 

 the sperm-sac passes, so that it may be said to take the place 

 of the penis. At the extremity are two hyaline threads, as 

 in Triarthra longiseta. 



Toes, none. 



Cilia, fairly long. 



Brain, large, occupying all the head and part of the body. 



Eye, large, bright red, circular in dorsal view, narrow in lateral 

 view, nearer the ventral than the dorsal side. 



Antennae, very minute on head and sides of carapace. No 

 digestive system. No glands made out, but the animal appears 

 to spin a thread from foot. 



Vascular system very indistinct. No contractile vesicle made out. 



Generative system, a large pouch containing spermatozoa and 

 other bodies, which may be seen in movement in the interior. 

 This pouch narrows to a long neck, which is woi-ked up and down 

 the foot, and is capable of protrusion ^from its extremity. 



Size, 3 Jo-th inch (= 84 /x). 



Habitat, pond at Neasden, April 2nd, 1903. 



Pterodina patina Ehr. (^, Fig. 3. 



Seen laterally, rather vermiform in shape, resembling a young 

 Proales petroynyzon. Dorsally, somewhat broad, but having no 

 approximation to the plate shape of the female. 



