ae BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
tions are quite similar to those of Esthonia. The faunal elements 
common to the two regions, however, are not so many as one could 
wish. 
A correlation is most readily made if the Borkholm formation be 
taken as a point of departure. It has its closest faunal relations with 
the Ellis Bay formation of the Anticosti section, where are found the 
following identical or closely related forms:— 
Calapoecia canadensis. 
Clathrodictyan vesiculosum. 
Halysites catenularia. . 
Paleofavosites asper. 
Protaraea vetusta (this form in Esthonia occurs in the Lyck- 
holm only). 
6. Zaphrentis affinis (a similar form in the Borkholm is called 
Streptelasma elongatum). 
7. Corynotrypa dissimilis. 
8. Hallopora elegantula, var. nov. 
9. Glauconema strigosa. 
10. Nematopora lineata. 
11. Phaenopora ensiformis. 
12. Protocrisina exigua (Charleton, not Ellis Bay). 
13. Ptilodictya gladiola. 
14. Sceptropora facula (Charleton, not Ellis Bay). 
15. Stomotopora arachnoidea (not in Borkholm, but Lyckholm). 
16. Atrypa marginalis. 
17. Clitambonites verneuili diversus (Shaler). 
18. Platystrophia regularis Shaler (European type with two plica- 
tions in the sinus and three on the fold). 
19. Leptaena rhomboidalis. 
20. Pseudolingula elegantula (Shaler) (P. quadrata in the Lyck- 
holm). 
21. Plectambonites sericeus. 
22. Byssonychia sp. nov. 
23. Calymene meeki Foerste. 
24. Encrinurus multisegmentatus. 
ST ete ea ae 
This constitutes a total of twenty-four out of ninety-five species, 
over twenty-five per cent of the Borkholm fauna, and coupled with 
this, is the further fact that each witnesses the occurrence in great 
numbers of a multitude of tabulate corals of Silurian aspect, which in 
— s+. +: 
