160 BULLETIN OF THE 
of the bell, nor the position and shape of the ovaries and proboscis. He omits 
also the lateral cirri found on intermediate tentacles. 
Development unknown. 
Locality, Newport, R. I. 
This medusa was discovered in Narragansett Bay by Mr. Agassiz, who has 
kindly loaned me his drawings of it for study. Two specimens were taken by 
the author in 1880. 
TRACHYNEMIDÆ. 
Sphærula formosa, n. g. & s. 
Plate 1. Fig. 13. 
. A single small jelly-fish, closely allied to Gegenbaur's genus Zurybiopsis, was 
taken in August of last summer. 
The bell is spherical, smooth, transparent, and with very thick walls. The 
depth of the bell cavity is about a half of the height of the bell itself. The 
radial tubes are simple, unbranched, and four in number. Their profile is not 
jagged. The veil is thick, muscular, and generally reversed, or turned into the 
bell cavity when the animal is at rest. In that respect it closely resembles 
Trachynema digitale, A. Ag. The motion of the animal in the water is accom- 
plished in part by muscular action of the veil. 
The proboscis is without peduncle, the stomach with open cruciform mouth 
There are no oral tentacles nor knobs, The mouth resembles closely the 
mouth of Trachynema digitale. Along the edges of the lips are rows of lasso- 
cells. The color of the whole proboscis is brownish and yellow. 
There are four very flexible, hollow, smooth tentacles, with large tentacular 
bulbs carried at an angle to the bell. Around them the tentacles are often 
tightly coiled. 
There are twelve otocysts, each composed of an ectodermic and endodermic 
layer. Ovaries wanting. Development unknown. 
A single specimen of this jelly-fish was taken. in the evening in August. I 
think from its want of ovaries that it is an immature form. The endodermic 
otolith leads one to place it with Liriope and Cunina, and not with Campanu- 
larians and Tubularians, where the whole otocyst with its enclosed otolith is 
ectodermic. 
Trachynema digitale, A. Aa. 
Plate IL. Figs. 5, 6, 7. 
Trachynema digitale is closely related to T. ciliatum, Gegenbaur. In the 
last part of May, this jelly-fish was very common in the bay, in every excur- 
sion filling the dip-nets with their numbers. I have been unsuccessful in a 
search for the very young forms, and have looked in vain in the stomachs 
of Tima and Zygodactyla, which were very common at the same time, in hopes 
