404 BOARD OF AGRICULTURE. 



8. A new fern resembling Cjclopteris Jacksoni, but having a 

 transversely pitted stem like that of C. Roemeriana, Goeppert; I 

 propose to name this, C. Rogcrsi. Plate IT. figs. 6 and T. 



9. A small but apparently new Sphenopteris. Plate II. figs. 8 

 and 8a. 



10. A Trichomanites, which I believe to be new. Plate II. fig. 9. 



11. Specimens of Leptophlreum rhombicum, showing that it 

 bifurcated and bore long narrow one-nerved leaves, and rendering 

 it probable that its fructification consisted of elongated strobiles 

 with narrow pointed scales. 



12. A new Hymenophyllites, too imperfect for description, but 

 possibly identical with one found at St. John. 



13. Two unknown objects which may be Carpolithes. 



The whole of the above are now under examination, and, I hope 

 more fully to describe them in the course of the winter. 

 I am, with sincere regard, truly yours, 



J. W. DAWSON. 



Lake Sedgwick. 

 At the close of the field work for the season, after the appropria- 

 tion for the survey had been exhausted, with the permission of the 

 commissioners to whom we are responsible, the geologist of the 

 survey at his own expense visited Lake Sedgwick (or Square lake) 

 in the north part of Aroostook county, and collected some of the 

 interesting Helderberg fossils found there for his own pleasure. 

 The specimens collected were placed in the hands of Mr. Billings, 

 Paleontologist of the Canada Survey, who was so kind as to de- 

 scribe them, although very much pressed b}^ other duties. It was 

 our intention to have presented these descriptions here ; but as they 

 have already been given to the world in the Proceedings of the 

 Portland Society of Natural History, the crowded state of this report 

 will render it unnecessary to repeat them. The thanks of all in 

 Maine who are interested in geology are due to Mr. Billings for 

 his aid in deciphering these relics of the past. The locality is an 

 unusually interesting one, and we hope it will be visited by other 

 collectors. Its richness can be judged of by the time occupied in 

 collecting these fourteen new species. We spent only a single- 

 day at the ledge, and brought away several barrels full of the pre- 

 cious remains. The locality may be reached by boat, either by way 

 of Portage lake or Fort Kent. 



