NEW FORMS OF MARINE DIATOMACE^). 



475 



of species, but rich in individuals, and these nearly all of interesting, rare, or new 

 species. 



I had thus eleven different materials, no two of which were exactly alike, al- 

 though in all certain prevalent forms occurred. In each, on the other hand, some 

 forms, few or many, were peculiar, and their presence gave a distinct character. 

 A careful study of the whole has yielded interesting results ; and these it is the 

 object of the present paper to state as briefly as may be consistent with ac- 

 curacy. 



The first observation is, that these waters contain a very large proportion of all 

 the known and described marine forms belonging to Britain, including a good many 

 which have hitherto been very rare ; so scarce, indeed, in some instances, that few 

 observers have seen them. I may specify the following as being by no means 

 rare, several, indeed, being abundant in these materials : — 



Coscinodiscus concinuus. 

 Eupodiscus crassus. 

 Ralfsii. 

 sculptus. 

 Campylodiscus Ralfsii. 



Horologium. 

 Navicula Hennedyi. 



granulata, Ereb. 

 Lyra, Ehr. 

 Pleurosigma rigidum. 

 obscurum. 



Pleurosigma delicatulum. 

 transversale. 

 Surirella lata. 



Hunantidium (?) Williamsoni. 

 Amphiprora elegans. 

 Podosira Montagnei. 

 Orthosira marina. 

 Grammatophora macilenta. 

 Biddulphia Baileyi. 

 turgida. 



The second observation which I made was, that, as I had anticipated, nearly 

 the whole of the new forms figured by me from the Glenshira sand are found 

 living, and generally abundant, in these waters. The following list contains the 

 names of such of the marine species, figured in my former papers, as I have found 

 in the new materials : — 



Cocconeis distans. 



costata. 

 Eupodiscus Ralfsii ; also var. /S, sparsus. 

 Campylodiscus simulans. 

 Surirella fastuosa, very large. 

 Amphiprora recta. 



lepidoptera. 

 Navicula rhombica. 



maxima. 



angulosa, and var. /3. 



humerosa. 



latissima. 



clavata. 



splendida. 



incurvata. 



didyma, var. y, costate 



Navicula didyma d. 



crassa. 

 Pinnularia Pandura. 

 longa. 

 inflexa. 

 Amphora Arcus. 



crassa. 



elegans. 



plicata. 



obtusa. 



Grevilliana. 



rectangularis. 



lineata. 

 Synedra undulata. 

 Tryblionella constricta. 

 apiculata. 



I think we can hardly doubt that all the new Glenshira marine forms will 

 ultimately be found in the neighbouring waters. 



