XXXI 
ON A STALK-EYED CRUSTACEAN FROM THE CAR- 
BONIFEROUS STRATA NEAR PAISLEY. 
Quarterly Journal of the Geological Soctety of London, vol. xvttt., 1862, 
pp. 420-422. (Read June 18th, 1862.) 
IN a paper published in the Geological Society’s ‘Journal’ (vol. 
ili. p. 363, 1857), I described several specimens of a Stalk-eyed Crus- 
tacean, from the rocks of carboniferous age, to which I applied the 
generic name of Pygocephalus, referring the genus to either the 
Decapodous or Stomapodous group of the Class. 
My friend and colleague, Mr. Geikie, F.G.S., has been so good as 
to draw my attention to what I believe to be another specimen of 
the same Crustacean, obtained by the Rev. Mr. Fraser, M.A., from 
one of the coal and ironstone mines in the Strath of the Clyde, about 
two miles from Paisley, in dark shale,! and by the obliging permission 
of its owner, has placed it in my hands for examination and descrip- 
tion. I say I deleve the new fossil to be another specimen of 
Pygocephalus, because in consequence of the different position in 
which the present specimen is imbedded in the matrix, a strict 
comparison with the others is almost impossible; and my deter- 
mination is based rather on general analogy of the forms than on 
a complete identification. 
While the other specimens presented a view of the ventral sur- 
face, this shows the lateral aspect of the animal, exhibiting a side- 
view of the carapace, of the thoracic and some of the cephalic ap- 
pendages, and of the large and curved abdomen. The carapace, the 
1 «This dark shale,” says Mr. Fraser, in a letter to me, ‘‘ is about 19 fathoms below the 
surface. The ironstone-clay-band lies about 7 fathoms above it ; and 36 fathoms beneath it, 
occurs what is known here as the Hurlet or Nitshill Coal.” 
