4S 
Plate Y. 
Figures 1, 2, 
Figures 3, 4. 
Figures 5, 6. 
Pseudolingula iowensis (Owen). (Page 14.) 
Brachial and pedicle valves of a specimen from the 
upper part of the middle Trenton at Trenton, Ont. Nat- 
ural size. 
Dalihanella testudinaria (Dalman), (Page 14.) .* 
From the Trenton at Trenton Falls, N.Y. In the 
Museum of Comparative Zoology, Cambridge, Mass. 
Twice natural size. 
Dalmanella rogata (Sardeson). (Page 14.) 
From Borenshult, Sweden. No. 3992 in the Museum 
of Comparative Zodlogy, Cambridge, Mass. Twice natural 
size. 
Figures 7, 8. Dalmanella resupinata Raymond. (Page 16.) 
A large silieified specimen from Grand island, Balsam 
lake, Ont. Twice natural size. No. 3241. 
Figures 9, 1>0. A smaller specimen of the same species, from the same 
locality. Twice natural size. No. 3241a. 
Figures 11, 12, 13, 14. Dalmanella whittakeri Raymond. (Page 16.) 
Four views of two specimens from the middle 
Trenton at Peterborough, Ont. Twice natural size. Nos. 
3240 and 3240a. 
