MUSEUM OF COMPARATIVE ZOOLOGY. 233 
port, R, I., from one of which the type was described, are evidently stragglers 
from cold water, where they are abundant, and not from the warm waters oe 
the Gulf Stream, from which they have yet to be taken. 
Melicertum campanula, Escu. 
This large and beautiful medusa is one of the most common at Grand, 
Manan. 
Specimens of the young in all stages of growth were easily collected. These 
are found to have been well described by Agassiz, and nothing of value was 
added to his observations. 
Nemopsis* bachei, Ac. 
Staurophora laciniata, Ac. 
This beautiful medusa is common at Grand Manan. It grows to a large 
size, and is one of the most conspicuous genera in sheltered bays near the 
north end of the island. I have also found several large specimens of Stau- 
rophora at Frye’s Island, New Brunswick.t 
Halopsis ocellata, A. Ac. 
Plate III. Fig. 1. 
The genus Halopsis was found quite abundantly near the wharfs at Grand 
Manan. The specimens which were taken differ somewhat from the figures 
and description of the type, but evidently belong to this species. 
The bell, in several specimens, is from four to six inches in diameter. Its 
walls are thick, without apical prominence. The radial canals arise regularly, 
* Sometimes erroneously written Mnemopsis. The derivation is vjua, tentacle, 
and dys. The use of the wrong spelling is liable to lead to confusion with the 
Ctenophore, Mnemiopsis. 
t In the surface fishing at Frye’s Island, New Brunswick, several interesting 
larve were found with Staurophora. Among these were many specimens of the 
singular worm larva, Mitraria. These larve were taken in great abundance in 
July, and were generally captured with the Miiller net in night fishing. In 
Narragansett Bay, Mitraria is not found. The problematicai affinities of this 
singular worm larva, and its abundance in Passamaquoddy Bay, would seem to 
invite naturalists to observations upon its development. 
Swarms of an Appendicularia different from that found at Newport were also 
observed at Grand Manan and Eastport. The body of the Grand Manan Appen- 
dicularia is larger than the Newport, and more dumb-bell-shaped, the tail arising 
from the middle of the body. 
