Journal 



OF THE 



NEW-YORK MICROSCOPICAL SOCIETY 



Vol. VIII. APRIL, 1892. No. 2. 



CORDYLOPHORA LACUSTRIS, AND FIVE NEW 

 FORMS OF ANIMAL LIFE. 



BV STEPHEN HELM. 

 (^Read December i,th, i8gi.) 



In the latter part of September last I explored the portion of 

 the Morris & Essex Canal lying between Pamrapo and Newark 

 Bay, N. J. On first inspection the result was disappointing, but 

 a more careful examination revealed isolated specimens of two 

 forms (PI. 29, Figs. 3 and 4) which were new to me. Thinking it 

 probable that another part of the same canal might perhaps yield 

 better results, I, on another occasion, proceeded to that section 

 lying between Greenville and Claremont. 



Here, to my intense satisfaction, I found the same two forms 

 in considerable abundance, and, to my delight, three others which 

 were also new to me (PI. 29, Figs, i, 2, 5). The question then 

 arose, What are they ? After carefully searching through all the 

 literature on the subject at my command, after communication 



Explanation of Plate 29. 



Fig. 1. The molluscan designated as No. 1. la. Egg-cluster as first observed. 

 16. Egg, with mulberry-shaped contents. Ic. The same advanced to a rotifer-like form. 

 Id. The free swimming "rotifer." le. The same at time of attachment. 1/. The same 

 with budding processes. — Fig. 2. Lagotia cceruleus Helm. 2 a, 6, c. Stages of develop- 

 ment (after Wright).— Fig. 3. Urnatella Walkerii Helm.— Fia. 4. Octocella libertaa 

 Helm.— Fig. 5. Cordylophora coronata Helm. 5a. The same : view of tentacles, web, 

 and oral aperture from above.— Fig. 6. Cordylophora lacustris Allman. 



