15 



submitted in the course of the autumn. The investigations of 

 the fourth student will be continued during the coming year. 



Since the last Report, Professor Mark has published a paper 

 on " Simple Eyes in Arthropods," in the Museum Bulletin, 

 Vol. XIII., No. 3, February, 1887. 



About the middle of the year several of the advanced students, 

 the Instructors in Zoology, and some of the Museum Assistants, 

 commenced a series of informal bi-weekly meetings for the dis- 

 cussion of zoological topics; these meetings were continued 

 till the close of the year, and proved to be interesting and 

 profitable. 



During the college year 1886-87 instruction was given by 

 Dr. Ayers in two courses of Zoology to forty-four students. 



A course in Vertebrate Anatomy was completed by thirteen 

 students ; one Graduate, eleven Seniors, and one special student. 

 The lectures and class exercises, fifty-four in number, were 

 devoted to purely anatomical topics, and were occasionally fol- 

 lowed by class demonstrations of the more important and acces- 

 sible objects. The Laboratory work embraced the study by 

 dissection of the following animals as types : the Lamprey, the 

 Skate, the Cod, the Pigeon, and the Cat. As text-books, the 

 class used W. N. Parker's translation of Wiedersheim's " Com- 

 parative Anatomy of Vertebrates," T. J. Parker's " Zootomy," 

 and Mivart's " The Cat." 



A half course in Zoology, forming the second half of the 

 course in Elementary Biology, was completed by thirty-one stu- 

 dents ; six Seniors, sixteen Juniors, five Sophomores, one Fresh- 

 man, two special students, and one Scientific student. The 

 work was begun in February, and included twenty-six lectures 

 and class exercises, with Laboratory work three days in the 

 week. The following animals were studied in the Laboratory : 

 Paramoecium, Vorticella (or Stentor), prepared specimens of a 

 Campanularian Hydroid and its Medusa, Antedon, the Starfish, 

 the Sea-Urchin, a Holothurian, the Lobster, the Squid, and the 

 Frog. 



The class in Biology (Nat. Hist. 5) has been conducted by 

 Professor Farlow on the same plan as in previous years, and the 

 number of students has been as large as the number of micro- 

 scopes at our disposal would allow. Owing to the unusually 

 large number of graduate students who occupied the room espe- 



