INTRODUCTION. 
This paper may be regarded as a continuation of the Cubomedusan 
studies pursued by Dr. F. 8. 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 
Cubomeduse”) 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 physiologi¢al 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’! 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 
if 
