102 
On a New Penetrating Alga. 
from the old shells of Unio. In this species the terminal cells taper 
at the end, but it is a very much larger species than the one under 
discussion, the cells sometimes reaching a diameter of 50/*. 
The species from the “ Cladophora balls ” has therefore been 
characterised as follows. 
Gomontia JEgagropilm SP. NOV. 
Thallo e filamentis a centro radiantibus, dichotomis atque 
ramulos tenues penetrantes emittentibus constante ; cellulis ramu- 
lorum apicalibus cylindricis vel attenuatis; cellula unaquaque 
chromatophora lobata parietali praedita, nuclei's 1-6, amyli granis 
plurimis. 
Propagatio cellulis apicalibus vel intercalaribus a thallo segre¬ 
gate, quae aut statim germinant aut cystae perdurantes crasse 
tunicatae fiunt. Zoogonidia non visa. 
Long. cell. 10—16yu. (cell, penetr. usque ad 110/x); lat. cell. 
8 - 10 /*. 
Hab. in parietibus emortuarum cellularum Cladophorce 
(JEgagropxlce) liolsaticce, Loch Kildona, S. Uist, Hebridum 
Exteriorum. 
The Botanical Laboratory, 
The University, Birmingham. 
DESCRIPTION OF PLATE I, 
Illustrating Miss Acton’s Paper on “A New Penetrating Alga.” 
Photograph of interior of pie-dish with thalli of Gomontia AEgagropila 
growing between the glaze and the earthenware. (Reduced to a little less 
than half-size). 
