36 THE ROTLFERA. 



STEPHANOPS CIEKATUS, Ehrenberg (42), (PI. XXXIII. fig. 25). 



SP. CH. Lorica armed behind with two spines. 



Ehrenberg merely notices the presence of the mastax, alimentary canal, gastric 

 glands, ovary, contractile vesicle, lateral canals, and two red, frontal eyes. 



Miiller's very characteristic figure (published 1773) of this Rotiferon is given in out- 

 line in PI. B. fig. 20. 



Length, ^-^ inch. Habitat. Near Copenhagen, and Berlin. 



STEPHANOPS TBirus, 1 Lord (112), (PI. XXXIII. fig. 24). 



SP. CH. Body pyriform behind, cylindrical and obliquely truncate in front, with 

 a curved tapering dorsal spine about the length of the head and trunk ; foot jointless, 

 with two toes, and a short dorsal process ; eyes absent. 



Mr. Lord, who discovered this species in 1884, gives (loc. cit.} the following account 

 of it. It is obliquely truncate in front ; anteriorly cylindrical for about ^ of its length ; 

 enlarging thence to about the middle of the body, whence it gradually decreases to the 

 base of the foot : here it is suddenly diminished to a short tapering foot, with two toes, 

 and a dorsal process springing almost from between them. The toes are about the 

 length of the foot. There are no eyes, and the frontal hood, seen sidewise, looks like a 

 hook. The cilia are in bundles ; and a long, tapering spine springs from the centre of 

 the dorsal region : the internal organs are difficult to make out : rare. 



Length. Not recorded. Habitat. A ditch containing Anacharis (Lord). 



STEPHANOPS LEYDIGII, Zacharias (201). 



SP. CH. Body spindle-shaped ; dorsal spine exceeding the animal's total length; 

 foot with two joints, but without dorsal process ; eyes two, minute. 



Dr. Zacharias, in his account of Leydigii, seems to incline to the opinion that it is 

 identical with tripus. There are, however, several points of difference. Leydigii has 

 no dorsal process at the end of the foot, above the toes : and its large dorsal spine is as 

 long as the whole animal, while that of tripus is not as long as the head and trunk. 

 Moreover Leydigii tapers, from the middle of the body, towards both extremities ; and is, 

 especially in front, not nearly so bulky an animal. Besides tripus is said to have no 

 eyes, while Leydigii has two minute red eye-specks : though it is possible, of course, 

 that these may have been overlooked. 



Length, T ' T inch. Habitat. Marsh-water (Zacharias). 



STEPHANOPS STYLATUS, Milne (186), (PL XXXIII. fig. 27). 



SP. CH. Lorica flattened ; its oval dorsal surface prolonged forward into a spoon- 

 shaped hood, backward to the middle of the foot, and there rounded off without spines ; 

 foot long, ending in two long, decurved, and divergent toes. 



The lorica is transparent, and rather tough than hard. The corona is nearly level 

 with the ventral surface. It has a few small cilia round the oral opening, in front of 

 which is a central spoon of uncinate styles. On either side of these a very strong unci- 

 nate one is placed, and at their roots a few smaller ones. These styles seem to be 

 ambulatory. From each side of the head proceeds backwards and outwards a very long 

 straight style of a soft and flexible character, but not vibratile. Near the bases of these 

 styles are two fairly large green nodules, which can be isolated. The brain-mass is occi- 

 pital. The mastax has small tropbi somewhat like those of Notops clavulatus. The 



1 Mr. Lord did not name this Steplianops ; so I have given it a specific title from the tripod-like 



ending of the foot. 



