i6 



MOORE. 



[VOL. I. 



is no necessity for disintegration to set them free. Of the 

 disappearance of the animal, and a possible explanation of it, 

 I will speak later. 



This species of Dinopliilns, which I take pleasure in calling 

 D. Gardincri, differs in certain features from those species 

 which have been noted by other observers. It is easily recog- 

 nized without a lens, for its bright orange-red pigment makes 

 a sharp contrast with the green algae upon which it is found. 

 The average length of the form is about i mm., but under a 



dissecting lens the highly 

 colored intestine, with its 

 characteristic stoma>ch por- 

 tion, and the red kidney- 

 shaped eyes, are noticeable 

 features. The body is 

 about three times as long 

 as it is broad, the propor- 

 tions varying, of course, 

 with extension or contrac- 

 tion ; it is somewhat flat- 

 tened dorso-ventrally, and 

 when fully extended tapers toward the 

 posterior end. It consists of six definite 

 segments, exclusive of head and tail, 

 distinctly visible in young individuals m 

 a state of extension (Fig. 2). Neither 

 young nor old individuals show segmen- 

 tation when contracted, and old ones show it only when making 

 a turn, not when moving rapidly in full extension. The head 

 is rounded in front and bears the eyes on its dorsal surface- 

 (Fig. i). The mouth is situated on the ventral surface poste- 

 rior to the eyes at, or just anterior to, the union of the head 

 with the first body segment. The small unsegmented tail 

 approximates the length of a body segment. It is consider- 

 ably narrower than the body and tapers to a point. The anus 

 is situated dorsally to its base. Owing to the scarcity of mate- 

 rial, I did not ascertain to my satisfaction the arrangement of 

 the cilia, but as nearly as I could determine the animal is com- 



FlG. I. 



