/. A. Mahony — Organic Remains in Cowdon Valley. 39 J 



poured off the water holding the lighter particles in suspension, 

 allowed the remainder to rest for a time, when the clear supernatant 

 liquid was removed and the residue dried and afterwards ignited for 

 half an hour, which dissipated the organic substances present; boiled in 

 strong hydrochloric acid, thus dissolving the alumina, iron, and lime, 

 and leaving a white powder composed exclusively of diatoms and 

 grains of quartz. These were separated to some degree by re^Deated 

 washings, the heavier fragments of quartz subsiding rapidly and 

 remaining behind. 



In submitting a list of the species of organic remains, I may 

 premise that a few of the names must, from the fragmentary state 

 of the objects, be held only as indicating their possible affinities. 



PLANTS. 



Desmidie^. — Micrasterias denticulata, in the sporangial state. 



Abundant. 

 Staurastrum polymorphum. A single example. 

 Cosmarium. An empty frond. 



DIATOMACEiE. 



Epithemia turgida. 



,, sorex. 



,, gibba. 

 Cymbella cuspidata. 



,, Ehrenbergii. 

 Amphora ovalis. 

 Cocconeis placentula. 



,, pediculus. 

 Gyclotella minutula. 

 Campylodiscus costatus. 



„ spiralis. 



Surirella biseriata. 



,, craticula. 

 Cymatopleura solea. 

 Navicula ovalis. 

 Pinnularia major. 



Pinnularia mesolepta. 



„ acuta. 



,, dactylus. 



Cocconema lanceolatum. 



,, cistula. 



Odontidium mutabile. 



„ Harrisonii. 



Denticula sinuata.^ 

 GompJionema subtile. 



,, acuminatum. 



Diatoma vidgare. 

 Tabellaria flocculosa. 

 Stauroneis punctata. 



,, linearis. 

 Melosira orichalcea. 



Hypnum rividare. 



„ cordifolium. 

 Climacium dendroides. 

 Pogonatnm nanum. 

 Bryum ^ ? 



MUSCI. 



LesMa sericea. 

 Hypnum palustre. 



„ tamariscinum. 



,, splendens. 



„ uncinatum. 



,, ruscifolium. 



Phanerogamia.— JJanwncM/MS aquatilis, Galium palustre, Pedicularis 

 palustris. Many seeds of these plants were foimd, chiefly in the 

 upper bed. 



^ This is the commonest form in the deposit, composing probably a fourth of the 

 whole. 



'^ This moss belongs to the subgenus Webera of Schimper. Texture and serratures 

 same as W. nutans, but leaves somewhat broader. 



