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 of 

 the Gulf Stream, from which they have yet to be taken. 



MelicertuEQ campanula, Esch. 



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. Ao. 



Staurophora laciniata, Ag. 



This beautiful medusa is common at Grand Manan. It grows to a large 

 size, and is one of the most conspiciious 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 Brunsvvick.t 



Halopsis ocellata, A. Ao. 



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 inclies in diameter. Its 

 walls are thick, without apical prominence. The radial canals arise regularly, 



* Sometimes erroneously written Mnemopsis. The derivation is vfjiua. tentacle, 

 and oi|/(y. The use of the wrong speUing is liable to lead to confusion with the 

 Ctenophore, Mnemiopsis. 



t In the surfajCe fishing at Frye's Island, New Brunswick, several interesting 

 larvae were found with Staurophora. Among these were many specimens of the 

 singular worm ' rva, Mitraria. These larvae were taken in great abundance in 

 July, and were generally captured with tlie Miiller net in night fishing. In 

 Narragansett Bay, Mitraria is not found. Tiie problematical 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 tliat found at Newport were also 

 observed at Grand Manan and Easfport. 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. 



