382 



SCIENCE 



[N. S. Vol. XLVII. No. 1216 



in the plankton during tiie summer. Many 

 collections of algae were made in other lakes, 

 in various streams and bogs. Many determi- 

 nations have been made and considerable pre- 

 served material awaits determination. 



In plant ecology, instrumental field work on 

 a new phase of the evaporation-plant-succes- 

 sion problem was carried on by B. H. Grisemer, 

 of Sisseton, S. Dak., and E. E. Watson, of the 

 University of Michigan, under the direction 

 of Dr. F. 0. Gates. Field work on a descrip- 

 tive account of the plant associations and their 

 successional relationships was continued and 

 extended by Dr. F. C. Gates, of Carthage Col- 

 lege. 



Under the direction of Drs. Gates and Hol- 

 man, the anatomical structure of the leaves of 

 certain land plants, this year growing sub- 

 merged, was investigated by Miss Mabel 

 Hardy, of the Highland Park, Michigan, High 

 School; the anatomy of Scirpus validus from 

 different associations by Miss Winifred Cor- 

 coran, student in the University of Michigan, 

 and the anatoimical characteristics exhibited by 

 the leaves of the dominant species of the hard- 

 woods and the aspens by E. L. Lambert, of 

 Carthage College. 



Professor Max M. Ellis, of the University of 

 Colorado, has brought the survey of the fishes 

 of the region to a point where the publication 

 of results seems desirable. This work has 

 covered three problems : (a) The species of the 

 region; (b) the local distribution of these 

 species and (c) the relations between the ex- 

 isting fish fauna and that of the Great Lakes. 

 Two papers on this work will be ready for 

 publication shortly. He also studied the eggs 

 and embryology of six species of fishes dur- 

 ing the summer. Large series of embryo 

 fishes were obtained for comparative studies. 

 The first of these studies will be completed 

 during the winter. Additional collections of a 

 new species of Branchiobdellid worm (descrip- 

 tion now in press) were obtained, and some 

 experiments concerning the feeding habits and 

 food of these worms were carried on during 

 the summer. These experiments were supple- 

 mentary to work in progress at the Univer- 

 sity of Colorado. A collection of Branchiob- 



dellid worms was made in the Lake Huron and 

 Potagannissing Bay waters. These worms 

 are in hand at present and the report will 

 soon be sent to press. 



Professor Ellis and Mr. G. C. Roe, of the 

 University of Colorado, have recently pub- 

 lished a paper in Copeia on the destruction of 

 log perch eggs by suckers. This paper was 

 based on data collected at the station during 

 the past summer. 



Mr. Roe has completed his collections of 

 mosquitoes started last summer and expects 

 to complete his work on these insects soon. 



Dr. A. R. Cooper, of the University of Illi- 

 nois, research assistant in zoology at the sta- 

 tion, devoted his attention to the parasites of 

 the fishes of the region with particular empha- 

 sis on the life-histories of the members of the 

 cestode order, Pseudophyllidea. He examined 

 one hundred and fifteen hosts belonging to 

 seventeen species but took only three species 

 of Pseudophyllidea. From young gulls, Larus 

 argeniatus, several cestodes, probably belong- 

 ing to the genus Diphyllobothrium Cobbold, 

 were taken. Many specimens of a cestodarian 

 worm in various stages of development were 

 taken from suckers. 



Mr. H. C. Fortner, working under the direc- 

 tion of Dr. La Rue, studied the parasites of 

 frogs from several localities of the region. 

 Some interesting data on the local distribution 

 of frog parasites were secured. So far as de- 

 termined at present the only new species 

 found was a species of the tapeworm Ophio- 

 tcenia, which constitutes the first record of the 

 taking of tapeworms of this genus from 

 Anura of IsTorth America. Further collections 

 are needed to complete the work. 



Dr. George R. La Rue investigated the 

 parasites of fishes, birds and snakes of the re- 

 gion. In all seventy-four hosts belonging to 

 nineteen species were examined. A number 

 of species not taken during the summer of 

 1912 were secured. The collections are be- 

 ing studied and it is hoped that they will yield 

 interesting data on the distribution and life 

 histories of certain parasites. 



Professor R. M. Strong, of Vanderbilt Uni- 

 versity, continued his work on problems of 



