GRAPTOLITES. 95 
angle with the axis cannot be satisfactorily determined from the specimen. 
Cell-partitions strong. 
The specimen from which this description is drawn, consists of the dise 
and a part of two stipes, the other two being broken off just beyond the 
disc ; one of the stipes measures nearly seven inches from the centre. 
When the disc is preserved, this species can be readily distinguished. Sepa- 
ated stipes bear a near resemblance to G. bryoncides; but the abrupt, 
narrowing at the base of the stipes, and the shorter denticles, character- 
ize G. bryonoides. In the specimen described, we have little more than 
an impression of the stipe, and this is ina coarse material ; so that there still 
remains some obscurity regarding the surface of the test, and the exact 
form of the cellules and their apertures. 
EXPLANATION OF Figure or GrapTouitHus Heapt, Hall. 
Puate VI. 
8. A representation of the specimen of the natural size, and as it occurs on the 
surface of the stone. (The upper separated portion of the stipe is placed 
a little lower in the figure than it is on the stone, in order to bring it 
within the dimensions of the plate.) 
Formation and Locality—Shales of the Quebec group ; Point Lévis. 
19. GRAPTOLITHUS OcTONARIUS, Hall. 
Plate X, figures 1, 2. 
(G. octonarius, Hall: Geological Survey of Canada, Report for 1857, page 124.) 
Description.—Frond consisting of eight stipes uniting in pairs at the 
base, and each pair again united in a similar manner, making one half the 
frond ; the two parts are joined by a funicle, in the centre of which is a small 
rootlet. The two sides are equal and symmetrical, giving a bilateral arrang- 
ment to the whole. Stipes narrow and rounded at the base, having a diam- 
eter of from two to four hundredths of an inch below the bifurcations ; in the 
figured specimen, at a distance of from one half to three fourths of an 
inch from the base, they are eleven hundredths of an inch wide. 
Solid axis distinct, the common body occupying a very small proportion 
of the whole width. Cellules elongate, distinctly curved, expanding ; making 
an angle of from 30° to 35° with the axis; the aperture is twice as wide as 
