PLA1TT8. 309 



Fossils collected on tlie San Juan Exploring Expedition (in 1859). 



Pp. 137-148, pis. iii.-viii. of the iteport noted on p. 138. 

 The botanical part deals with a number of plant-remains obtained 

 from the Triassic rocks of the region examined, 11 new species being 

 described and figured : see Index, of Species. H. A. N. 



O'Meara, Rev. Eugene. Diatomaceous forms, with a new species of 

 CoUetoneyna, from subfossU material found along with remains of 

 Megaceros. Qiutrt. Journ. Micr. Sci. vol. xvi. pp. 416, 417. 

 Many diatoms obtained from subfossil material found at Bally betagh, 

 under the bed containing the bones of the extinct Irish Elk, are re- 

 ferred to known genera and species ; but one remarkable form is 

 believed to be new, and is called Colletonema Hibernicum. E. T. N. 



Peruzzi, Ot. Descrizione di alcune Filliti deUa Lignite del Casino. 



[Fossil Leaves from the Lignite of Casino.] N. Giorn. Bot. Ital. 



vol. viii. pp. 63-77, 

 28 species are described, of which one, a Sequoia, is supposed to be 

 new. 



Renault, B. Recherches sur la Fructification de quelques Vegetaux 

 provenant des gisements silicifies d'Autun et de Saint Etienne. 

 [Fruit-cones, &c. from Coal Measures.] Ann. Sci. Nat. ser. 6, 

 Botan. t. 3, pp. 29, pi. 4. 

 Silicification has resulted in the preservation of minute structure. 

 Some reniform fruit-capsules are referred to Zyyopteris ; and it is pro- 

 bable that the fertile frond Androstachys is a part of this plant, and 

 Schizopteris pinnata the barren frond of the same. The relation of the 

 fruit-cones, Bruchmannia, VolJcmannia, and 3Iacrostachya, is dis- 

 cussed : Bruckmannia Grand-Euryi, n. sp., has 36 bracts in the 

 verticil, and verticils of 18 sporangiophores ; B. Decaisnei has 24 sterile 

 bracts and 12 sporangiophores in the respective verticils. The anatomy 

 of Volkmannia gracilis is here made known. A portion of Macro- 

 stachya, enclosing macrospores, is held to be the cone of Equisetites m- 

 fiindihdiforrnis. A second form of Volkmannia is regarded as the 

 fruit of Asterophyllites equisetiformis. E. B. T. 



Saporta, Coimt G. d6. Les associations vegetales fossiles dans leurs 

 rapports avec la nature physique des depots qui les renferment. 

 liev. Sci. t. xi. pp. 33-38, 64-68. 



In judging of the vegetation of an epoch the influence of habitat 

 should not be disregarded ; e. g. the flora of a bituminous shale formed 

 in marshy or humid places will show different genera from deposits 

 on higher ground in same epoch. Again, there is a likeness in the 

 schist-floras of the Rhajtic in Scania and Franconia, the Oolite of 

 Yorkshire and Spitzbergen, the Wealdcn of N. Germany, &c. Among 

 floras are those of strata deposited in quiet lakes, rivers, estuaries, 

 peaty lagunes, thermal sources, and eruptive tuffs, these last giving the 



