5 
Localities: Big and Little Quill Lakes, Saskatchewan. Very abundant. 
The above species is the most characteristic one in the Quill Lake gatherings. 
It bears a close resemblance in general aspect and dimensions to Swrirella striatula 
Turpen, of which it may be only a variety; but as indicated in the above diag- 
nosis, it differs in important particulars. It also nearly resembles Pantocsek’s 
S. torquata, from the marine fossil deposits of Karand, Hungary, the latter 
exhibiting similar sizes of costae, striae and marginal points, being also similarly 
twisted. S. striatula is a marine species, and besides occurring in the modern 
ocean is found in the same fossil deposits as S. torquata. There can be but little 
doubt that the form now under consideration is of marine origin. |S. striatula 
also occurs in the salt water of the Great Salt Lake in Utah, where varieties 
like ovata and Brightwellii of Brebisson’s S. ovalis are found. These marine 
forms are found in the Quill Lakes, if not also a variety Quillensis, as distinct as 
Grunow’s variety S. ovata K. var. Utahensis, which is nearly identical with 5S. 
ovalis Breb. var. Brightwellit Sm. 
Cyclotella Quillensis, L. W. Batu. 
(Plater, Fie. 2). 
Valves circular, in the form of low vaulted domes, of which the surface is 
sometimes slightly undulated. The size varies from 50 to 70 microns. Striae 
radiant as in Cyclotella compta, but arranged in three or four concentric circles, 
of which the outer has the character of ribs rather than striae, being strong and 
more or less distinctly pearled, while the second is much fainter and the third 
visible only with high powers. Even a fourth circle can sometimes be made out, 
approaching the apex of the low zone. The number of marginal ribs is about 
6 in 10 microns, and from these, in many cases, spring spines from one to two 
microns long, thus bearing a close resemblance to Stephanodiscus. Minute 
nodules are sometimes visible at the inner end of the second, third or fourth 
zone of radiating striae. The centre of the dome is usually smooth, but some- 
times shows a number of dots irregularly arranged. The species is larger than 
C. Kutzingiana or C. compta, being more like C. Meneghiniana. The marginal 
radial ribs look as if they might have been developed from striae originating like 
those of S. astrea or S. Niagarae, while the fainter second circle is not continuous 
with these, but appears to spring from an inter-rib depression. 
Localities: Big and Little Quill Lakes, Saskatchewan. 
Chaetoceras Quillensis, L. W. Batu. 
(Plate I., Fig. 2). 
Primary frustules quadrate, concatenate, in zonal view from 4 to 16 mu, 
in valval view 6 to 18 mu. Secondary valves unlike, the surface of one rising 
into a well marked dome, while the second, by a marked constriction becomes 
bottle-necked. Between one frustule and another extends in some instances 
a small tube, connecting dome with dome as in Chaetoceras Elmorei, Boyer. 
Setae 4 to each frustule, straight, 100 microns or more in length, crossing at 
joints and making angles of less than 60 degrees. Foramina narrowly linear. 
Locality: Quill Lake, Saskatchewan. 
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