148 
THE GEOLOGIST. 
Ichthyodorulite seems occasionally preserved, and there are also other 
indeterminate fragments of bone. 
Not having had access to Mr. Salter's monograph, I am not able to 
pronounce upon the species of crustaceans found in these beds. We 
have at least several very large Pterygoti, judging from the sculptured 
rings of the abdomen, their curious jaw-feet and prehensile limbs ; 
and I should think both Hhnanto/^terus and Enrypterus. I have care- 
fully treasured all the crustacean remains that I have found, in the 
hope of light yet reaching us in this remote region as to their generic 
and specific character. All that I can affirm is, that we must have 
had an abundant development of the family in the era when our 
rocks were laid down, of all sizes, from half an inch to many feet, and 
with various styles of ornamentation. There also occur numerous 
pieces of shell or skin, sometimes torn, but at other times bounded 
by straight lines, drawn in black in the stone, and which an humble 
friend of mine compared to the pieces — of course, in miniature — of 
which a black cloth coat on the back of a human subject is composed. 
We must not omit to mention a very peculiar form, which has been 
named the Kampetm-is, from its resembling the impression in the 
stone of a butterfly-caterpillar, and which I have often thought might 
be the larval form of some of our crustaceans. 
Our plant-remains, like those of Kidderminster, are for the most 
part badly preserved, although in some layers they are very abundant. 
Our most common and characteristic organism is the Parka decipiens, 
which, occurring over three counties in Scotland, viz. Kincardine, 
Forfar, and Fifeshire, has now also been detected in England. I do 
not know on what ground it can be spoken of as Pterygotean ova. 
It is true, our quarrymen, in their rude northern phrase, call it "pud- 
dock crud," or the spawn of frogs, but they are chiefly familiar with 
the fossil as it occurs in the more micaceous beds, known in commerce 
as " Arbroath pavement," where it is always much broken and dis- 
persed. I still believe it to be vegetable. I have several specimens 
with the seeds (?) inclosed in a sort of spathe, the sides of which 
radiate from a base or disc, to which is attached apparently a stem. 
There are also several distinct bodies which might correspond with 
the spores of Lycojmliacece, besides many other obscure vegetable 
forms. On the whole, therefore, there is a striking similarity between 
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