WILLIAMS.] 
THE SQUARE LAKE FAUNA. 
55 
Ashland limestone). It approaches the fauna of St. Helena Island, 
Quebec, and appears, from what is known of it, to be represented by 
the limestones in southern Quebec, about Lake Memphremagog. 
Petrographically, the Square Lake limestone differs from the Ash- 
land in its freedom from the fractures and faulting which the latter 
presents wherever seen. This may be a local peculiarity, but it never- 
theless serves to confirm belief in the later period of formation, to 
which the fossils testify. 
The collection from Square Lake in the hands of the writer was 
made by Olaf O. Nylander, and was purchased for the United States 
Geological Survey. The specimens have been studied in connection 
with the original description of the fauna by Billings, published in 
the proceedings of the Portland Society. 1 
A list of the species reported by Billings, and other lists by Bailey 
and Mclnnes, are given on a preceding page (p. 32). Most of the 
specimens of the present collection are recognized as species named 
by the authors above mentioned. Some of the specimens are not so 
recognized, or are species new to the fauna. The list is given below, 
and follows the order of genera adopted by Billings, indicating the 
cases of identity by reference to Billings's species by number: 
Fauna of 1094 A. 
1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 
10. 
11. 
12. 
13. 
14. 
15. 
16. 
17. 
18. 
19. 
20. 
21. 
22. 
23. 
24. 
Favosites sp. (=B1.) 
Zaphrentis cf. rugulata. (=B2.) 
Cladopora cf. seriata. 
Cf. Choetetes. 
Cf. Stromatopora. 
Crinoid stems of several species. 
(=B4, 5.) 
Lyriocrinus cf. melissa. 
Strophomena rhomboidalis. (=B8.) 
Strophomena punctulifera. (=B9.) 
Strophomena indenta. (=B10.) 
Strophodonta cf. perplana. (=B11.) 
Strophonella leavenworthana. 
(=?B14.) 
Cf. Leptaena sp. 
Orthothetes cf. subplanus. (=?B14.) 
Orthis subcarinata. 
Orthis oblata. 
Orthis cf. eminens. (=?B13.) 
Orthis, two undetermined species. 
Orthis cf . discus. (=B12. ) 
Bilobites varica. 
Rhynchonella mainensis. (=B15.) 
Rhynchonella nucleolata. (=B16.) 
Rhynchonella aspasia. (=B17.) 
Rhynchonella bialveata. (=B18.) 
25. Rhynchonella pyramidata. 
26. Rhynchonella transversa. 
27. Rhynchonella cf. vellicata. 
28. Eatonia medial is. (=B20.) 
29. Eatonia medialis var. 
30. Atrypina imbricata 
31. Atrypina cf. disparilis. (=?B21.) 
32. Trematospira maria. (=B22.) 
33. Trematospira hippolyte. (=B23.) 
34. Trematospira multistriata. 
35. Trematospira simplex. 
36. Rhynchospira electra. (=B25.) 
37. Nucleospira pisiformis. 
38. Nucleospira ventricosa. 
39. Parazygadeweyi. (?=B19) ("Rens- 
selseria Portlandica Bill.") 
40. Cf. Cryptonella eximia. 
41. Atrypa reticularis. (=B26.) 
42. Atrypa reticularis (with fringe). 
43. Athyris harpalyce. (=B28.) 
44. Athyris sp. 
45. Spirifer macropleurus. (=B29.) 
46. Spirifer hesione. (=B30.) 
47. Meristella princeps. 
48. Meristella bella. 
49. Meristella laevis. 
i Proe. Portland Soc, Nat. Hist., Vol. I, Pt. II, 1869, pp. 104-125. 
