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 unknowm. 



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. 



TRACHYNEMID^. 



Sphaerula formosa, n. g. & s. 



Plate I. Fig. 13. 



A single small jelly-fish, closely allied to Gegenbaur's genus Euryhiopsis, 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, hoUow, smooth tentacles, Avith 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 wdth its enclosed otolith is 

 ectodermic. 



Trachynema digitale, A. Ao. 



Plate II. Figs. 6, 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- 

 Hion 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 Timu and Zygodactyla, which were very common at the same time, in hopes 



