742 Proceedings of Royal Society of Edinburgh. [sess. 
The medusoid fauna of the Clyde is distinctly littoral, and the 
true oceanic medusae take no share in it. Not a single Tracho- 
medusa or Narcomedusa was seen. The littoral character of the 
fauna of this region is also well marked for other groups of animals. 
Medusa classed as “Inhabitants” or “Visitors.” 
The Clyde Sea-area covers about 1100 square miles, and is simply 
a large inlet of the sea. Within this large area one finds that a 
certain number of the pelagic animals may be regarded as “ local 
inhabitants ” which have been established there for countless 
generations. The wide opening of the firth to the North 
Channel, between Ireland and Scotland, gives facilities for other 
animals to enter its waters from the south, and these may be 
regarded as “ visitors.” In many cases the evidence is not 
sufficient to show definitely whether a species belongs to the 
local inhabitants or is a visitor from the south. There can he no 
doubt that the pelagic fauna of the Cumbraes is largely recruited 
by animals which come up the firth from the south, hut some of 
them may be the “local inhabitants” at the southern end of the 
firth. Until the fauna at the southern end has been examined 
on the same lines as those recorded in this report, it is impossible 
always to draw definite conclusions. 
I have attempted to separate the medusae into these two groups, 
and have placed a query against the species about which I am in 
doubt. 
(a) Inhabitants of the Clyde. 
Corymorpha nutans. 
Cytceandra areolata. 
Euphysa aurata. 
Hybocodon prolifer. 
Lar sabellarum. 
Margelis britannica. 
Margellium odopundatum. 
Podocoryne carnea. 
Sarsia eximia. 
Sarsia tubulosa. 
Thamnitis, sp. 
Tiara pileata. 
Melicertidium odocostatum. 
Obelia dichotoma. 
Obelia lucifera. 
Obelia nigra. 
Phialidium buskianum. 
Phialidium cymbaloideum. 
Phialidium temporarium. 
Tiaropsis multicirrata. 
Aurelia aurita. 
Cyanea capillata. 
