No. 497] THE BUREAU OE FISHERIES 



335 



sionally penetrate the muscular tissue of their hosts. 

 Upon tracing it forward, it proved to be a lateral pro- 

 longation of the anterior end of the swim bladder. At its 

 origin it corresponded in structure to the swim bladder, 

 but at its posterior (i. e., distal) end it was rather firm 

 and the walls were thickened. The alcoholic specimen, 

 which has contracted somewhat, is 60 millimeters in 

 length. (3) Butterfish were examined on five occasions 

 for the flesh parasite described in the Bulletin of the 

 Bureau of Fisheries.' 8 The proportions of infected fishes 

 were rather less than in previous years. (4) Consider- 

 able attention was given to the parasites of the puffer 

 (Spheroides maculatus) with a view to preparing a spe- 

 cial paper on the entozoa of that fish. (5) The prepara- 

 tion was begun of tables of the distribution of the para- 

 sites of fishes based upon collections made by Dr. Linton, 

 at Beaufort, Bermuda, Tortugas and Woods Hole. These 

 tables have since been completed and sent to the Bureau 

 of Fisheries at Washington. (6) A beginning has also 

 been made in the collecting of parasites from inverte- 

 brate hosts for the purpose of securing stages in the life 

 history of those parasites of fishes whose early stages are 

 found in invertebrates. 



Albert J. May, A.M., instructor in the Boys' High 

 School, Reading, Pa., made observations upon the medusa? 

 of various local hydroids, and collected material for 

 future study. Corymorpha pendula, which was especially 

 sought for, on account of obscure facts in its life history, 

 unfortunately proved to be very rare. 



Hansford MacCurdy, Ph.D., professor of biology, Alma 

 College, devoted most of his time to the study and tabula- 

 tion of results obtained during the preceding summer 

 relating to the hybridization of echinoderms. 



William J. Moenkhaus, Ph.D., associate professor of 

 physiology, University of Indiana, continued studies, 

 •VaL 26, pp. 111-132. 



