Tilden: BIBLIOGRAPHY OF AMERICAN ALGAE. 383 



1093. Robinson, J, The Flora of Essex county, Massachu- 

 setts. Essex Inst. 1-200. 1880. Salem.— (Bot. Gaz. 6:187, 

 188. Mrl881.) 



1094. Rogers, R. E. Infusorial Earth from Richmond and 

 Rappahannock river, Virginia. Proc. Phil. Acad. 1859: iii. 

 (3Myl&59.) 1860. 



Specimens presented. 



1095. Rogers, W. B. On the Limits of the Infusorial 

 Stratum in Virginia. Am. Jour. Sci. Arts. 45:313, 314. 

 JlAgS1843. 



1096. . On Fossil Infusoria. Am. Jour. Sci. Arts. 



46:141,142. OND1843. 



Fourteen species of diatoms, additional to Professor Bailey's list, 

 noted. 



1097. . Geology of the Virginias. — (Am. Jour. Sci. 



III. 30:357-374. N1885. III.3 1:193-202. Mrl856.)— (Am. 

 Mo. Mic. Jour. 7:115. Jel886.) 



1098. Romeo, N. A. Pleurosigma angulatum. Am. Jour. 

 Mic. and Pop. Sci. 5: 137, 138. Jel880. 



1099. Roniinger, C. Palaeozoic Rocks. Geol. Surv. Mich. 



Upper Peninsula. (1869-1873.) 13:1-102. 1873. 

 A number of fucoid forms noted. 



1100. Rose, J.N. Nostoc. and Penicillium in NaC.^HgOj. 

 Bot. Gaz. 10:280. Myl885. 



1101. . Notes on the Conjugation of Spirogyra. Bot. 



Gaz. 10:304-306. 1 jJl. Jn885. 



1102. Rosenvinge, L. K. Beitrage zur Kenntniss der 

 Gattungen Ulothrix und Conferva. Bot. Tidsskr. III. 3:114- 

 134. 1879-80. 



Specimens from Greenland. 



1103. . Om Spirogyra groenlandica, nov. spec, og 



dens Parthenosporedannelse. Oefvers. Kongl. Vet. Akad. 

 Foerhandl. 40: n. 8. 37-47. 79^. 8. 1834.— (Bot. Centralb. 20: 

 165. 1884.)— (Jour. Roy. Mic. Soc. II. 5:285. Apl885.) 



Describes a new species of Spirogyra from Greenland, collected by 

 Fries in 187L 



1104. . Les Algues marines du Groenland. Ann. 



Sci. Nat. VII. 19:53-164. /. i-J7. 1894. 



1105. Rothpletz, A. Ueber die Bildung der Oolithe. Bot. 

 Centralb. 51:265-268. 1892.— (Jour. Roy. Mic. Soc. 1892: 

 839. D1892.) 



Calcareous stones from the shore of Great Salt Lake in Utah found 

 to be covered with Gloeocapsa and Gloeotheca. 



