112 Transactions. — Zoology. 



variety in— (1) Less plumpness of body ; (2) less clifference in 

 circumference of body and foot ;. and (3) greater transparency 

 of body. 



No colour. The whole Eotifer is very long and slender. 

 The body proper is less than a third of the length of the whole 

 animal. It shows the plumpness referred to in the British 

 specimens in only a slight degree. It is ornamented with 

 longitudinal flutings of various distinctness, but these are 

 never obtrusive, and have always to be looked for. The foot 

 is very long, slender, and tapering ; it consists of six telescopic 

 joints, and is perfectly retractile ; the second last joint bears 

 a pair of spurs whose tips are slightly curved. There are 

 three very small toes, which are usually hidden by the spurs 

 of the penultimate joint. The anterior part of the body — 

 the neck and head, if I may so speak — is also long and 

 slender, and very much pointed when fully extended. In 

 this condition the cilia seem to be confined to a small 

 narrow projecting lobe, but when the Eotifer is about 

 to feed the anterior part of the head is completely_ re- 

 tracted, and the corona and ciliary wreath spread out into 

 two broad wing-like lobes, making the wreath a sinuous 

 curve right round them, and broken only ventrally opposite 

 the mouth. The mouth leads back by a narrow gullet (in 

 which is a pair of kidney-shaped glands) to the pharynx, 

 which is provided with a pair of ramate trophi. These are 

 shaped hke angular coffee-beans, and work upon each other 

 somewhat after the manner of a crayfish's mandibles. There 

 are on each a great number of teeth, in the form of transverse 

 ridges ; of these, the two central are by far the most promi- 

 nent. The two trophi are not quite parallel, but diverge 

 slightly behind. The stomach and intestine lead to the 

 cloaca, which is a rectal, excretory, and reproductive chamber. 

 Eather indistinct bands of muscles work the retractive move- 

 ments of the foot, but the other muscles could in no case be 

 seen. I did not observe any foot-glands ; probably these are 

 of less importance here than usual, because of the mechanical 

 contrivance to secure the toe-hold. The three toes are spread 

 out and placed on the glass, and then the second last joint is 

 pulled down over them, and acts like a ferrule. Obviously 

 the strength and quantity of the cement secreted by the foot- 

 glands need not be so great here as if the whole weight of tne 

 animal were to be supported by that alone. I never observed 

 any brain. There are two small red eyes. These lie right in 

 the anterior of the head, and, when this region is protruded, 

 appear to lie quite in the anterior lobe of the corona. They 

 move back very considerably when the corona is expanded in 

 the act of feeding. 



In the dorsal side of the " neck," just anterior to the body, 



