32 
CONTRIBUTIONS TO THE GEOLOGY OF MAINE. 
[BULL. 165. 
date of the article is "Montreal, January 12, 1863." The catalogue 
of the fossils from Square Lake, described by Billings, is as follows: 1 
1. Favosites gothlandica Lam. 
2. Zaphrentis cf. Z. prolifica. 
3. Diphyphyllum. 
4. Crinoid, with moniliform column. 
5. Crinoid, with smooth, round column. 
6. Fenestella. 
7. Incrusting Bryozoan on Orthoceras. 
8. Strophomena rhomboidalis Wahlen- 
berg. 
9. Strophomena punctulifera Con. 
10. Strophomena indenta Con. 
11. Strophomena perplana Con. 
12. Orthis cf. O. discus Hall. 
13. Orthis sp. "a larger species" or 
nearly the same form. 
14. Streptorhynchus ? 
15. Rhynchonella mainensis n. sp. 2 
16. Rhynchonella nucleolata Hall. 
17. Rhynchonella aspasia n. sp. 3 
18. Rhynchonella cf. bialveata Hall. 
19. Rensselseria portlandica n. sp. * 
20. Eatonia medialis Hall. 
Billings observes 17 that the aspect of the collection is that of the 
Lower Helderberg, but there are many new species, " and as it is not 
quite clear that this fauna can be exactly paralleled with the Lower 
Helderberg (although it must certainly be very nearly related) it is 
best to call it Upper Silurian for the present." 
Species No. 30 of the above list is the same as that referred to Spiri- 
fer perlamellosa in the Maine report (see p. 31, No. 10), and the 
author proposed the name S. hesione for it, but refers it provisionally 
to S. raricosta Con. Athyris blancha, No. 27 of this list, is cited as 
A. hella in the Hitchcock report of 1861 (see p. 31, No. 12). 
Under the name Strophomena pimctulif era Con., Billings includes 
the forms figured as S. punctulifera, S. headleyana, and S. cavimibona. 
Under the name Strophomena perplana Con. , Billings intends to include 
S. pluristriata Con., S. planulata, S. crenistria, and S. fragilis Hall; 
and under the genus Retzia King are included Trematospira and 
Rhynchospira. 
21. Leptoccelia n. sp. 
22. Retzia maria n. sp. 5 
23. Retzia hippolyte n. sp. 6 
24. Retzia dubia n. sp. 7 
25. Retzia electra n. sp. 5 
26. Atrypa reticularis Linn. 
27. Athyris blancha n. sp. 9 
28. Athyris harpalyce n. sp. 10 
29. Spirifera macropleura Con. 
30. Spirifera raricosta Con.,S. Hesione? 
Bill. 11 
31. Platyceras 1 both allied to P. subangu- 
32. Platyceras J lata. 
33. Loxonema iitchi ? Hall. 
34. Orthoceras rigidum Hall. 
35. Dalmanites epicrates n. sp. 
36. Phacops trajanus n. sp. 12 
37. Proetus macrobius n. sp. 13 
38. Proetus Junius n. sp. u 
39. Bronteus pompilius n. sp. 15 
40. Lichas.? 16 
iProc. Portland Soc. Nat. Hist., Vol. I, Pt. II, pp. 104-105. 
2 Op. cit, p. 110, fig. 4. s op. cit., p. 114, fig. 11. 
3 Op. cit., p. 111. 9 Op. cit., p. 115, fig. 13. 
4 Op. cit., p. 115, fig. 12. i<> Op. cit., p. 116, fig. 14. 
6 Op. cit.. p. 112, fig. 8. « Op. cit,, p. 117, fig. 17. 
6 Op. cit., p. 112, fig. 9. 12 Op. cit., p. 124, fig. 26. 
7 Op. cit., p. 113, fig. 10. 
is Op. cit., p. 123, fig. 24. 
14 Op. cit., p. 122, fig. 25. 
1 5 Op. cit., p. 123. fig. 25. 
16 Op. cit., p. 125, fig. 28 
"Op. cit., p. 105. 
