298 BULLETIN OF THE 



have formed between each pair of tentacles, so that we have a stage in which 

 there are four tentacles and twelve otocysts. Between each pair of tentacles 

 there are three marginal sense bodies, instead of a single otocyst as in the larva 

 last described. The beginnings of other tentacles alternating with the otocysts 

 are visible on the bell rim as simple protuberances from the margin. 



The adult is derived from the medusa last mentioned by a change in form 

 of the bell and a growth of the protuberances which form in the last-mentioned 

 larva the beginnings of the new tentacles. In the most developed stage which 

 was taken, the medusa has assumed a form like that figured (107*) by Mr. 

 Agassiz. The color of the bell of this medusa is light green, and that of the 

 ovaries is white. 



The likeness between the youngest Phialium which is here described and 

 the planoblast Lovenella* is so great, that there is no doubt that these two 

 genera are identical. The Lovenella stage of Phialium is remarkable, accord- 

 ing to Haeckel, in the exceptional number of otocysts, which are generally 

 eight in the young of other Leptomedusag. Tbe existence of otocysts shows 

 that it has no affinities with the Anthomedusae, and it is extremely doubtful 

 whether it has any relationship with the TrachymedusaB.t 



Epenthesis folleata, McCrady. 



Figs. 10-14. 



Several specimens of E. folleata, McCr. were found at Newport about the 

 end of August. 



The differences between this medusa and that of Oceania languida, A. Ag. 

 seem to me great enough for a generic separation. 



The bell of the adult is low, disk-shaped, and about one sixteenth of an inch 

 in diameter. "Walls transparent, thin, with smooth outer surface. There are 

 four narrow, unbranched chymiferous tubes. The sexual organs are small 

 spherical bodies, which hang in the bell cavity limn a position on the tubes 

 midway between the base of the proboscis and the bell margin. The proboscis 

 is small, and has a light green color. Its lips are four-lobed and hang down a 

 short distance into the bell cavity. There arc sixteen tentacles, which alter- 

 nate mi the bell rimwith. the Bame number of otocysts. Bach otocyst regularly 

 contains a single otolith. The tentacular bulbs have a red or crimson color. 

 Two clusters of pigment are found in the tentacular bulb. The smallest 

 occupies the position of the ocellus. 



* In what I have identified as a young Phialium (Lovenella Btage) the small 

 tentacles (spun) do net arise so near the lithocysta ;is in Bincks'a figures (Ann. Mag. 

 Nat. Hist., VIII., 1871, p. 7:», PL V.figs. 2\ 2 b ). It however agrees with his draw- 

 ing in being destitute of ovaries, which are found in the figure of L. gracilis given 

 by Prof. I Harke ("//. eit.). 



t Ilueekel, oj>. cU. 



