THE LOWER CARBONIFEROUS BEDS OF HOOK. 
149 
shale and sandstone, w T ith red ochreous limestone, followed by flaggy 
limestones, sufficiently pure to be used for agricultural purposes. 
A very remarkable series of beds, consisting of calcareous sand-* 
stone passing into limestone, and decomposing into a soft pulverulent 
mass, full of fossils, immediately succeeds the plant sandstones. In 
this group of beds, which is about 180 feet in thickness, a peculiar 
group of fossils, of which some are undescribed, occurs. Two of 
the most remarkable are figured in Plate II. 
Figure 7, Modiola Woarwoyensis. —This modiola resembles in 
some respects the common carboniferous fossil, called Lithodomus 
dactyloides by Professor M‘Coy; but is of smaller dimensions, and 
characterized by fine, well-marked, longitudinal lines radiating from 
the umbones, but not reaching to the margin. The lines of growth 
are well shown. I have called it Woarwoyensis, from the name of 
the locality, where it is found in abundance, and was first disco¬ 
vered by me, viz., Woarwoy Bay. 
Length = 1‘3B in. 
Breadth (anterior) =0-49 ,, 
„ (posterior) = 0 - 52 „ 
Figure 8, Sanguinolites Woarwoyensis. —This species in some re¬ 
spects resembles the S. sulcatus of Phillips, to which it is allied. 
Posteriorly, the ridges are as well marked as in S. sulcatus; but the 
bifurcation is much less distinct, and the species is considerably 
smaller. 
Length = 0*45 in. 
Breadth = 1-07 ,, 
The beds in which these fossils occur are characterized by a well- 
marked group of fossil remains, which occupy a definite position 
immediately above the plant sandstones. The following are the most 
abundant of the species:— 
Orthis crenistria. 
Atrypa fallax. 
Reticularia (Sjp.) 
Productus caperatus. 
P. antiquatus. 
Modiola Woarwoyensis. 
Sanguinolites Woarwoyensis. 
Actinocrinus (£p.) 
The beds just described are succeeded by thick beds of yellowish 
