REPORT OF COMMISSIONER OF FISH AND FISHERIES. 153 



began for tlie Fish Ooiniiiission an exliaiistive inquiry iuto the develop- 

 ment and .spawning' luibits of the lobster, one of the most interesting 

 marine forms now being propagated artiticially at the Woods Holl Sta- 

 tion. He also collected material bearing upon the embryology of other 

 crustaceans inhabiting this region. 



Prof. Edwin Linton, of Washington and Jefterson College, who has 

 been engaged for several years in a study of the entozoau and other 

 worm parasites of fishes, was employed to continue his field researches 

 and to make additional observations in respect to this subject. Fish 

 diseases, so far as they have been investigated, ai^pear to be almost 

 entirely tlie result of parasitism in one form or another, and it is, there- 

 fore, very important that the relations of these low organisms to their 

 respective hosts should be made out with as much care as possible. 



Dr. C. F. Hodge, of Clark University, was at Woods Holl during the 

 first part of the summer, and afterwards joined the steamer J^/.s/t Hawlc 

 as naturalist in connection with the oyster investigation. While at the 

 station he was occupied in making observations upon the feeding habits 

 of larval lobsters, and in attempting to rear them through their free- 

 swimming stages, during which period they are subject to great mor- 

 tality. 



Mr. James I. Peck, of Johns Hopkins University, was engaged to 

 investigate the habits and distribution of the young of the scui) and 

 sea bass, two of the principal food-fishes of the Vineyard Sound region. 

 His observations were made both in the field and with the aid of the 

 aquaria. 



Johns Hopkins University was represented at the station by four inde- 

 pendent workers. Dr. B. A. Andrews, Mr. T. H. Morgan, Mr. S. Watase, 

 and Mr. R. P. Bigelow. Dr. Andrews investigated the anatomy and de- 

 velopment of certain annelid worms, and Mr. Bigelow the comparative 

 histology of the discophore medusae, and the habits and the physiology 

 of i)hysalia. The researches of Mr, Morgan were mainly in the direction 

 of the pliylogenetic life history of jelly-fishes, of which he examined speci- 

 mens of Cyaneaartica, Aureliajiavidulaj and Pelagia jhwt also paid some 

 attention to the develo]>meut of i)ycnogonids, of which three species are 

 found in this regicm. Mr, S, Watase continued his studies, begun in 

 18S8, on the structure and relationshi]) of the eyes of crustaceans and 

 echinoderms. Preliminary reports on this subject had ])reviously been 

 jtublished by him, 



Mr, W. ]\IcM. Woodworth, Mr. C, B. Davenport, and Mr. E, R. Boyer 

 were i)resent as representatives of Harvard University. Mr. Wood- 

 worth was chiefly interested in tracing the develoi)ment of a small para- 

 sitic planarian which infests the gill lamella' of the king crab; Mr. 

 Davenport, in studying the structure and development of marine and 

 fresh-water polyzoa, and of Bopyrus palwnionites, the latter being an 

 isopod parasite living on the comnnm i>rawn {Palwmonites vulgaris); 



