128 
Therefore, these new crinoidal acquisitions reinforce in a most de- 
cisive way the correlation which Mr. Kindle has made of the extensive 
Upper Devonian formations of Mackenzie River district. 
Before proceeding to the description of the new species, and for the 
better understanding of their occurrence the notes made by Mr. Whittaker 
and Mr. Hume, relative to the stratigraphy of the crinoidal formations 
are given. 
Note by E. J. Whittaker 
The accompanying crinoids from Trout river, Mackenzie River district, N.W.T., 
which were collected in 1921, occur at the top of a bed of impure greenish grey limestone. 
This is overlain by a heavy-bedded, pure limestone and separated from it by a parting of 
greenish shale about 2 inches thick. The crinoids project from the upper surface of the 
limestone into this shale. The upper pure limestone is characterized by an abundant, 
undescribed moUuscan fauna with Cryptonella cf. pinonensis as a characteristic braehiopod. 
The lower impure limestone belongs to the Spirifer disjunctus horizon of the Upper Devon- 
ian. Associated with this bed is a large coral fauna including AcermUaria and PhiUips- 
astraea. This bed is the uppermost stratum of a series of pure and shaly limestones, 260 
feet of which are exposed, characterized by Spirifer disjunctus. The crinoid bed is prob- 
ably slightly higher (100 feet to 150 feet) than the horizon on Hay river in which Melo- 
crinus borealis Springer was collected by the writer in 1917. 
Note by G. S. Hume 
The crinoids were collected from a coral reef in limestone which is described in Sum- 
mary Report, 1922, as the Lezorhynchus zone. The fossils from this limestone are as follows: 
Lezorhynchus sp., very abundant 
Camarotoechia contracts, abundant at certain horizons 
Schizophoria iowaensis 
Spirifer disjunctus , common at certain horizons and rather long range 
Aihyris angelica , rather rare 
Rhynchonella duplicate, rare 
A few undetermined lamellibranchs 
From the crinoid coral reef a fauna quite different from this was found in the same 
limestone. It is as follows: 
Cladopora sp. 
Diphyphyllum arundinaceum , abundant 
Phillipsastraea vemeuili, common 
PhiUipsastraea sp., small eorallites 
Aulopora sp. 
Atrypa reticularis, abundant 
Atrypa spinosa, abundant 
Hypothyris cuboides 
LezorhynchiLs sp. 
Spirifer sp. 
Crinoids 
The stratigraphic position of the limestone in which these fauna occur is above a 
series of shales which are the equivalents of the Simpson shales described by Mr. Kindle. 1 
The fauna of the Simpson shale is correlated by Mr. Kindle with the Portage of the New 
York section: consequently, the crinoids occur higher stratigraphically than the equiv- 
alents of the Portage. 
1 Geol. Sunr., Canada, Mug. Bull, No. 29. 
