188 Proceedings of the Royal Society of Edinburgh. [Sess. 
crinoidal in the lower, and passes down into a calcareous shale almost 
entirely made up of the crushed valves of Productus semireticulatus 
associated with the branches of Lepidodendron, which at once reminds 
us of the Blackbyre Limestone of the type locality, and, like it, is under- 
laid by a seam of coal. The limestone is followed by 6 feet of massive 
sandstone, on which rests the characteristic nodular limey fireclay found 
on the same position in the Hurlet district. Above the nodular fireclay 
comes 2 feet of entomostracan shale, followed by 4 feet of encrinital 
limestone, which we take as the equivalent of the Hurlet Limestone. A 
thin band of shale occurs between the entomostracan limestone and the 
Hurlet Limestone, but the Alum Shale fauna has not as yet been found 
at this locality. 
About 350 yards further upstream the same section is repeated on the 
left bank, but the strata above the Hurlet Limestone are better shown than 
in the last exposure, and show the Blackhall Limestone in its characteristic 
development, with the highly fossiliferous blaes above it. 
From this point to the waterfall above Calderwood Castle the sides 
of the glen are formed by a group of shales with bands of ironstone, 
which are succeeded by the thin bedded sandstones on which the castle 
is built. 
About half a mile above Calderwood Castle the Calderwood Limestone 
Series is well shown in a steep cliff on the left bank of the stream. In 
the bed of the stream the Main Hosie Limestone appears in two posts, 
separated from each other by 2 feet 6 inches of highly fossiliferous shale, 
amongst which the following species occur : — Pisocrinus globularis, Hydre- 
ionocrinus scoticus, Beyrichia bituber culcita, Kirkbya urei, Seminula 
ambigua, Ghonetes laguessiana, Crania quad, rata, Piscina nitida, Lin- 
gula mytiloides, Productus longispinus, P. semireticulatus, Rhynchonella 
pleurodon, Spirifer lineata, S. trigonalis, Spiriferina octoplicata, Dielasma 
hastata, Edmondia rudis, Axinus axiniformis, Myacites sulcata, San- 
guinolites variabilis, Aviculopecten fimbriatus, Pecten sowerbii, Pleuro- 
tomaria contraria, Murchisonia urii, Ortlioceras Iceve, Petalodus liastingsice, 
and Tomodus convexus. This shale may be considered to be very rich 
in the remains of crinoids, small corals, polyzoa, entomostraca, and fora- 
minifera. The mollusca and brachiopods are not nearly so abundant as 
in the limestone below the Hurlet Limestone, but Discina and Crania 
occur in abundance. The Top Hosie or Calderwood Cement occurs a little 
higher up in the same cliff section as the Main Hosie. The following is 
a list of the principal species that occur in the Calderwood Cement or 
associated shales of the neighbourhood : — Serpulites carbonarius, S. mem- 
