McLean. — On the Fossil Genus Sporocarpon . 89 
the Burntisland and Halifax Hard beds. It was in the latter that they 
were noticed for the first time by Messrs. Spencer and Binns. 
The sections which I have chiefly consulted are those in the Williamson 
Collection at the British Museum ; the University College, London, Collection; 
Prof. Seward’s Collection at Cambridge, and some in the possession of 
Dr. D. H. Scott and myself. I wish to express my indebtedness to 
Prof. F. W. Oliver and Dr. D. H. Scott for the kind loan of their prepara- 
tions, and to Mrs. Scott for a similar kindness with regard to photographs 
and drawings. 
Literature cited. 
1. McLean, R. C. : A Group of Rhizopods from the Carboniferous Period. Proc. Camb. Phil. 
Soc., xvi. 493, 1912. 
2. Williamson, W. C. : On the Organization of the Fossil Plants of the Coal Measures. Parts IX, 
X, and XII. Phil. Trans. Roy. Soc., pp. 169, 17.1, 174, 1878-83. 
3 . Scott, Rina: On Traquairia . Ann. Bot., xxv. 459, 1911. 
4 . Hacker, V. : Thalassothamnidae, &c., of the Valdivia Expedition. Zool. Anzeiger, xxx. 878, 
1906. 
5. Cavers, F. : The Interrelationships of Flagellata and Primitive Algae. New Phytologist, 
Reprint, No. 7, 1913. 
-6. Lankester, E. R. : A Treatise on Zoology. Part I, Fasc. i, p. 284, 1909. 
7 . Hinde and Fox : On a Well-marked Horizon of Radiolarian Rocks in the Lower Culm Measures 
of Devon, Cornwall, and West Somerset. Quart. Journ. Geol. Soc., li. 609, 1895. 
8. Rust : Palaeontographica, xxxviii. 116, 1892. 
.9. Hill and Jukes-Browne : On the Occurrence of Radiolaria in Chalk. Quart. Journ. Geol. 
Soc., li. 600, 1895. 
EXPLANATION OF PLATES VIII-X. 
Illustrating Prof. McLean’s paper on Sporocarpon. 
PLATE VIII. 
Fig. 1. Sporocarpon elegans. Tangential section, showing the numerous spines arising from the 
honeycomb-like framework which forms the outer limit of the ‘colonnade’ layer. Towards the 
centre the attenuated waists of the colonnade units may be seen in cross-section, and between them 
their delicate tangential connexions. Tams phot. Lent by Mrs. Scott. This specimen is figured in 
Williamson, Part X, and the slide is in his collection, x 100. 
Fig. 2. S. elegans. Median section, showing a shrunken capsule and several spines, the 
extremities of certain of which (at a) may be seen to branch. Tams phot. Lent by Mrs. Scott, 
x 100. 
Fig. 3. S. elegans. Median section, showing the structure of the colonnade of spine base units 
with exceptional clarity. Capsule and sporoids well preserved. Where the spine bases are in contact 
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