NOTES ON THE FAUNA OF PENMAENMAWR. 317 



Shetland Seas of vast banks of Rhizosolenia shruhsolei, a 

 marine diatom ; and he noticed also what was so conspicuous 

 at Penmaenmawr, namely, the almost total absence of the 

 ordinary surface organisms in the tracts of sea infested by 

 the gelatinous Algae. 



A list of the animals obtained by dredging and shore 

 collecting around Penmaenmawr has been drawn up,* but as 

 this is probably far from complete, it has been thought best 

 to keep it for one of the future volumes, so that at least 

 another season's work might be incorporated with it. The 

 following species may, however, be mentioned as being 

 amongst those which have been collected at Penmaenmawr 

 this year : — 



Coryne pusilla, Thaumantias convexa, Aglaophenia 

 pluma, Vermilia triquetra, Thelepus circinatus, Bugula 

 flabellata, Amathia lejidigera, Pycnogonum littorale, Botryl- 

 loides 7'ubrum, Ascidia virginea, Ascidia scabra, Styela 

 grossularia, Philine apertcii and CyprcBci euroycea. 



* The specimens collected by Mr. Thompson have been distributed to 

 the Authors of the various Reports, and will be found noticed under the 

 groups to which they belong. — Ed. 



