82 TRANSACTIONS OF THE ROYAL CANADIAN INSTITUTE. [VOL. XI 
IV. 
SPECIES FROM THE SILURIAN DRIFT. 
ACERVULARIA AUSTINI, Salter sp. 
STREPHODES? AUSTINI, Salter. Sutherland’s Journal of Captain Penny’s Voyage to 
Wellington Channel, etc., Vol. II, appendix, p. CCXXX, 
pl. 6, figs. 6, 6a, 1852. 
ACERVULARIA AUSTINI, Lambe. Cruise of the Neptune, p. 322, 1906. 
ACERVULARIA AUSTINI, Parks. Bur. Mines of Ont., 22nd Rep., pp. 192, 196, 1913. 
The collection contains four specimens from different localities 
differing only in the size of the corallites which vary from 3 to II mm. in 
diameter. In one specimen the maximum diameter is 7 mm. In A. 
austini the maximum diameter is 8 mm. and Lambe states that the 
maximum of the specimens brought by Mr. Low from Beechey island 
is 10 mm. The finest of our specimens corresponds remarkably with 
A. gracilis, Billings, as redefined by Lambe. It is very likely that the 
mere size of the corallites is not of specific value and that A. gracilis 
is a synonym for A. austini, which antedates it. (See Lambe, op. cit.) 
Salter’s original description is as follows: “‘This fine coral which 
we dedicate with great pleasure to the gallant commander of the Expe- 
dition, is one of the most frequent species. It occurs in the form of 
rounded masses from an inch to several inches in diameter, covered on 
all sides with stellate cells—at first sight looking very like the Asiree 
of the present seas. The internal structure, however, as of nearly all 
the corals of the older rocks, is quite of another order. Prof. McCoy,. 
to whom I submitted these figures of the corals with drawings and notes 
has kindly given me his opinion on several of them. He would prefer 
to regard this as Clisiophyllum rather than Strephodes from the internal 
structure. 
‘Surface covered by hexagonal or pentagonal cells, of various sizes, 
the larger ones frequently four lines across, the smaller ones in groups 
of two, three, or more at the angles of the others. The extreme edges 
of the cups are thin and crenulated, their sides thickened and sloping 
steeply. In a large star they are radiated by about 30 or 40 equal 
blunt lamellae, which extend to the base, and about half of them are 
there united in bundles of three or four, and are twisted on the surface 
of a low boss which rises from the centre. The lamelle are united 
everywhere by frequent vesicular plates. A transverse section below 
the cup shows narrow but distinct divisional walls between the cells; 
and the lamellz twisted in the middle and united loosely by the vesi- 
