26 ANNUAL REPORT OF THE 



reviews for " The American Naturalist." He has in preparation 

 two papers, one " On Longitudinal Division in Metridium and the 

 consequent Arrangement of Mesenteries," the other " The Photo- 

 mechanical Changes in the Retinal Pigment of Gammarus." In 

 co-operation with a student of Radcliffe College he is also preparing 

 an article on " The Coronary Blood Vessels of Fishes." 



Dr. Castle has in progress a paper dealing with the Anatomy 

 and Classification of the Genus Clepsine, which has been the out- 

 growth of studies begun in connection with the class work in 

 Zoology 4. 



I have written a short article on " A Table of Ocular Micrometer 

 Values," Jour, of Applied Microscopy, Vol. I. No. 1, p. 4, and a 

 preliminary account of the external anatomy of a new and in- 

 teresting deep-sea Actinian dredged by Mr. Agassiz in the Gulf 

 of Panama. It is the last of the Contributions published, being 

 No. XCIII. 



The opportunities for the study of Marine Zoology which the in- 

 structors and students of the Department have so long enjoyed at 

 the private laboratory of the Director at Newport, and which the 

 demands of his own investigations have now compelled him to 

 withdraw, are in a measure supplied by the facilities offered at the 

 U. S. Fish Commission Laboratory at Wood's Hole ; but the De- 

 partment cannot fail to recognize, more clearly than ever, the great 

 advantage which the Newport Laboratory has been to it in afford- 

 ing such exceptional opportunities for work and the collection of 

 material for study in the laboratories at Cambridge. 



