1892.] NEW-YORK MICROSCOPICAL SOCIETY. 45 



— one-fourth of an inch in length — and means of locomotion, it 

 moves pretty rapidly and without any apparent effort, its motion 

 being the easy, firm, sliding movement so familiar in the slug and 

 snail. 



The processes seem to develop with the growth of the animal,, 

 the maximum number I have seen being seven pairs. The twO' 

 anterior processes are more pointed than any of the others, and. 

 are generally directed forward. Of the remainder, the second 

 pair is forked for about one-half of the long diameter ; the third 

 pair divided into three ; the fourth into two again; whilst the re- 

 mainder are single, the posterior pair being considerably smaller 

 than the others. They are all slightly inclined backward as the 

 animal moves along. The body terminates in a pointed tail 

 equal to about one-third of its length. 



The current is produced by innumerable '* papillae," which 

 move with a sort of undulatory motion and apparently cover 

 every portion of the body. The first impression produced is that 

 of cilia, and in certain lights it is difficult to persuade one's self 

 they are not, as when seen edgewise they are very thin. They 

 are often quiescent, and what purpose their motion serves I can- 

 not imagine, as the animal seems to feed slug- fashion ; and 

 though I have not yet made out its mouth, its possession of a 

 lingual membrane presupposes the existence of one. 



I have not absolutely satisfied myself as to the method of re- 

 production, but after many observations have arrived at certain 

 conclusions. The body is composed of sarcode, and in the tail a. 

 rapid circulation may be seen; but the central portion of the body 

 is so opaque that very little can be made out without dissection^ 

 and until my stock increases I am loath to sacrifice many in that 

 way. Underneath the frog-like pigment cells of the back I have 

 observed many round cells, and, suspecting them to be immature 

 egg clusters, I isolated two specimens and found my suspicions. 



Explanation of Plate 30. (After Allman.) 



Fig. 1. Cordylophora lacustris Allman. attached to a dead valve of Anodon cygneus. 

 Reduced two-thirds natural size.— Fig. 3. A branch, magnified, with the polyps in va- 

 rious states of expansion, and with the reproductive capsules more or less developed. 

 —Fig. 3. Longitudinal section of polyp, to show the details of its structure, a. Ec- 

 toderm. 6. Polypary. c. Processes from the ectoderm attached to inner surface of the 

 polypary. d. Endoderm. e. Mouth. /. Post-buccal cavity, g. Stomach, h. Common 

 canal of the ccenosarc. i. Muscles. 



