INTRODUCTION. 



This paper may be regarded as a continuation of the Cubomedusan 

 studies pursued by Dr. F. S. Conant while in Jamaica, in 1896 and 1897, 

 with the Johns Hopkins Marine Laboratory. His systematic and 

 anatomical results have since been published as his Dissertation ("The 

 Cubomedusa3") by this University. Conant described this paper as 

 Part I, hoping soon to add a second part on the physiology and the 

 embryology, for which he had some notes and material at hand. 

 Returning, however, to Jamaica with the laboratory, in 1897, he 

 continued his physiological experiments, and preserved material for 

 histological purposes. Upon the untimely death of Conant, his material 

 and notes were placed in my hands by Professor Brooks, to whom I 

 here take the opportunity of expressing my appreciation and sincere 

 thanks for the honor thus conferred and for the many favors received. 



In this paper I shall note at some length Conant's physiological 

 results and append his notes. I shall also add my results on the 

 histology of the eyes and the sensory clubs in general, with some few 

 facts on the histology of the tentacles. The embryology will be 

 reserved for a future paper. 



The forms used in the physiological experiments were Charybdea 

 Xaymacana, one of the two species (see Literature V, a and b) 

 first found and described by Conant ; Aurelia aurita ; Polyclonia and 

 Cassiopoea. The greater number of Conant's notes are on Charybdea, 

 and were left by him just as taken at the time of experimenting. 

 Many of these notes are highly interesting and in the main fit in 

 well with Romanes 11 and Eimer's^ results. 



Dr. Conant's work on Charybdea, in 1897, was wholly done at 

 Port Antonio, Jamaica. At first Conant had only varying success in 

 obtaining Charybdea, scouring the harbor and neighboring water at 

 all hours, only to obtain but few specimens. It was on the forenoon 

 of August 7th, while we were dredging at the head of East Harbor 

 with a steam launch, that many Charybdeae were brought up in the 

 dredge. This gave Conant a clue to their whereabouts and to the 

 means of obtaining them, and from that time on he was able to 

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