14 
* 
I 
Explanation op Plate I. 
Cyrtina glabra n.sp. 
Figures 1, 2, and 3. Pedicle, arealy and brachial views of the type specimen, x 2. Crushing of the 
pedicle valve is responsible for the depressed area shown in figure 2. Geol. 
Surv., Can., Mus. No. 7968. 
Buchiola retrio striata. 
Figure 4. Right and left valves attached, x 3. 
Figures 5 and 6. Fragmentary right valves showing surface sculpture, x 5 and x 3. Geol. Surv., 
Can., Mus. Nos, 7969, 7969a, 7969b. 
BucMola dilata n.sp. 
Figure 7. View of the type specimen, x 4. Geol. Surv., Can., Mus. No. 7970. 
, * 
Ontario clarkei. 
8. Right and left valves of a specimen, x 1> Geol. Surv., Can,, Mus. No. 7971. 
Paraptyx cf. Ontario. 
9. View of a part of a right valve, x 1. The concave face of the crescent to the left of the 
beak bearing three or four indistinct strise is not shown in the figure. Geol. Surv., 
Can., Mus. No. 7972. 
Bactrites aciculum. 
10. A crushed specimen, x 1. Geol. Surv., Can., Mus. No. 7973. 
Tentaculites mackensiensis n.Sp. 
11. View of type specimen, x 5. The abrupt change in width 5 mm. from the tip of the 
cone is apparent only, not real. It is due to the figure showing immediately above 
that point the impression and below it the actual shell. Geol. Surv., Can., Mus. 
No, 7974. 
