122 fauna of the isles of scilly. 



Leptomedusje. 



EucMlota pilosella (Forbes). Two small specimens. 



Laodice calcarata, Agassiz. Common. 



Chiefly very early stages without gonads and some inter- 

 mediate stages with gonads appearing. Umbrella 2 — 7 mm. in 

 diameter. No adults. One specimen with the parasitic Halcampa. 



Obelia nigra, Browne. Few adults. 



Obelia lucifera, Forbes. Few adults. 



Phialidium huskianum (Gosse). Common. Early to adult stages. 



Saphenia miraiilis ("Wright). Three specimens. Gonads well 

 developed. Umbrella 7 — 9 mm. in diameter. 



Altogether 17 species of Medusae were taken within the 

 week. All are known to occur in the English Channel, and all 

 were taken during that summer at Plymouth. It was not a good 

 summer for Medusae. The result of seven weeks' work at the 

 Marine Biological Laboratory at Plymouth only yielded five 

 additional species, viz. : — Sarsia prolifera. Irene sp. ? Octorchis 

 gegenhauri, Phialidium temporarium and Phialidium cymhaloideum. 



SlPHONOPHORA. 



Muggicea atlantica, Cunningham. 



This little siphonophore was abundant, especially the gono- 

 phores bearing ripe generative cells. It was scarce at Plymouth 

 early in July, but abundant at the beginning of August. 

 CupuUta sarsii, Haeckel. sp. ? 



Only a few detached swimming bells and a fragment of a 

 colony were taken. They probably belong to this species, which 

 is often very abundant on the west coast of Ireland during the 

 summer months. A solitary swimming bell A\'as taken in the tow- 

 net off Plymouth on July 4th. 



CTENOPHOEA. 



Not a single Ctenophore was taken. Their absence is note- 

 worthy, because Pleurolrachia pileus was fairly common at 

 Plymouth about the beginning of July and a small specimen of 

 Bolina norvegica was seen on June 30th. 



