A PORTAGE FAUNA IN THE MACKENZIE RIVER VALLEY. 
7 
From T. s peculus and T. attenuatus it differs in having much finer annul a- 
tions and in the absence of the fine, intermediate striae which characterize 
these two species. 
Horizon and Locality. Simpson shale; below Wrigley II miles. 
*% 
CEPHALOPODA. 
» » 
Bactrites adculum (Hall). 
Plate I, figure 10. 
Coleolus adculum Hall, Pal. N.Y., vol. Y, pt. II, p. 187, pi. 32A, figs. 
11-16. 
Bactrites adculum Clarke, N.Y. State Geol., 16th Ann. Rept., 1896, p. 
160j pi. 9, figs. 17-19. 
The fragile cones of this shell are among the most common fossils in 
the fauna. They seldom show any markings except the longitudinal 
fracture lines induced by crushing, which are generally present. A few 
annulations spaced about § mm. apart have been observed on a single 
individual. 
Horizon and Locality. Simpson shale; Mackenzie river 5 miles above 
Rabbitskin river. 
OSTRACODA. 
Entomis variostriata Clarke. 
* 
Plate II, figures 1, 2, and 3. 
E. variostriata T. R. Jones, Ann. Mag. Nat. Hist., vol. YI, 1890, p. 323, 
pi. XI, figs. 5-8. 
E. variostriata T. R. Jones, Ann. Mag. Nat. Hist., vol. IY, 1879, p. 182, 
pi. XI, figs. 1, 5, 7, 11-14, 16. 
Outline of shell as shown on Plate II is somewhat variable. The 
surface sculpture consists of sharply elevated concentric lines which fork 
at intervals and sometimes terminate abruptly. The delicate branching 
strise between these lines, described by Jones, have not been observed 
probably because of the less perfect preservation of the surface characters. 
This is a very abundant fossil in certain strata. 
Horizon and Locality, Simpson shale; Mackenzie river 5 miles above 
Rabbitskin river. 
Entomis serraiostriaia (Sandberger). 
Plate II, figures 4, 5, and 6. 
Entomis serratostriata Jones, Ann. Mag. Nat. Hist., vol. YI, 1890, p. 320, 
pi. XI, figs, la, b, 2 a, b. 
The essential characters of this little oval ostracode are shown in Plate 
II. It occurs abundantly in association with E. variostriata. 
Horizon and Locality. Simpson shale; Mackenzie river 5 miles above 
Rabbitskin river. 
