162 THE ZOOLOGIST. 



except for the brown contents of the stomach, were nearly 

 colourless. No eye-spots were seen, and, it may be stated, 

 importance is attached to this negative character in denning the 

 genus Callidina, although it is an admittedly unsatisfactory one. 

 The foot was comparatively short, and the spurs were small, 

 curved, and pointed. 



40. Callidina bihamata, Gosse. — This Eotifer was found in 

 large numbers in moss from Hyde Lane, near Leverstock Green, 

 on December 19th, 1912, and in the luxuriant growth of moss, 

 previously referred to, near the western end of the lane from 

 Dudswell to Champneys, on September 30th, 1913. In the 

 specimens examined, the trunk was longitudinally ribbed, some- 

 what swollen, and quite distinct from the head and foot. Avery 

 conspicuous feature was the presence at the oral end of two 

 crossed hooks on a short frontal column, and another feature 

 was the dorsal antenna "situated at a comparatively great dis- 

 tance from the oral extremity of the Eotifer. No eye- spots were 

 seen. One of the specimens was measured, and found to be 

 about g^j-inch long. The movements of these Eotifers were 

 rapid, the bdelloid progression being effected with great smart- 

 ness, and the Eotifers usually extending themselves to their full 

 length ; this bdelloid movement often passed into a rapid 

 gliding one. 



41. Adineta vaga, Davis. — In a luxuriant growth of moss, on 

 the Bucks side of Shire Lane, between Gholesbury and Hastoe, 

 several specimens of this remarkable Eotifer were obtained on 

 October 16th, 1913. They were about ^-inch long. The foot 

 was abruptly separated from the trunk. Two very divergent 

 hooks projected from the oral extremity, and no eye- spot was 

 seen. The head was flattened and its ventral surface was 

 furred ; by means of this furred surface the Eotifers moved 

 along the slide. Some of the specimens were seen to anchor 

 and then extend themselves to their full length over the surface 

 of the slide, then rapidly draw back, and then repeat these 

 movements in a different direction, the foot being kept anchored 

 at the same spot on the slide. After repeating these movements 

 until most of the area around the point of anchorage had been 

 covered, the Eotifers moved to fresh positions, where they 

 anchored again and repeated the movements just described. 



