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NEW FORMS OF MARINE DIATOMACEZ. 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. Pleurosigma delicatulum. 
Eupodiscus crassus. transversale, 
Ralfsii. Surirella lata. 
; sculptus. Hunantidium (?) Williamsoni. 
Campylodiscus Ralfsii. Amphiprora elegans. 
Horologium. Podosira Montagnei. 
Navicula Hennedyi, Orthosira marina. 
granulata, Préb. Grammatophora macilenta. 
Lyra, Ehr. Biddulphia Baileyi. 
Pleurosigma rigidum. ssi turgida, 
obscurum, 
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. Navicula didyma 6. 
costata. se. crassa. 
Eupodiscus Ralfsii; also var. 8, sparsus. Pinnularia Pandura. 
Campylodiscus simulans. ae longa. 
Surirella fastuosa, very large. ar inflexa. 
Amphiprora recta. Amphora Arcus. 
f lepidoptera. crassa. 
Navicula rhombica. ... elegans. 
maxima. ... _ plicata, 
angulosa, and var. f. ... obtusa. 
humerosa. x Grevilliana. 
latissima. ...  rectangularis. 
clavata. lineata. 
splendida. Synedra undulata. 
incurvata. Tryblionella constricta, 
didyma, var. y, costate Mas apiculata. 
I think we can hardly doubt that all the new Glenshira marine forms will 
; ultimately be found in the neighbouring waters. 
