2 Mee pe 
Zoology and Botany. 427 
§ 12. It is recommended that in subdividing a genus, the new generic 
names proposed for the subdivisions formed, agree in gender with that 
of the original genus. 
~§ 13. It is recommended that in proposing new genera, the ety 
4 of the names be always stated ; and that one species be pointed out as 
a type or standard of vehipende, 
§ 14. It is recommended that new genera and species be amply de- 
fined, and that the descriptions be inserted in such periodical or other 
or as are likely to obtain immediate and extensive circulation. 
James D. Dana, A. Binney, 
S. S. Hatpeman. C. U. SHeparp. 
D. H. Storer. C. Dewey. 
Pe Pas : A. A. GouLp, J, D. WuenPtey. 
‘A E, C. Herricr. 
2. Apntacs. —Mr. Francis Walker of London is engaged in the pre- 
paration of a work on the Aphides of Great Britain. 
: 3. Caricography- —In the third portion of Dr. Boott’s memoir on 
; new or little known Carices, read before the Linnean Society of Lon- 
don in February last, seventeen species are described, the characters 
of which are given in the Proceedings of the Linn. Society, published 
in Ann. and Mag. Nat. Hist. for September. The following are na- 
tives of North America, viz. Carex Geyeri, gathered in the Rocky 
Mountains by C. A. Geyer ;—allied to C. phyllostachys : C. juncea, 
Wild. (to which Dr. Boott refers C. miser, Buckley, described in this 
Journal) : C. Sullivantii, first described in this Journal, vol. xlii, p. 29; 
and C, Tuckermani, (C. bullata, Tuckerm., not of Schk 
4. Fossil Ferns from Frostburg, Kirst collééted by Mr. Lyell ; 
by C. T. F, Bunsury, Esq., (Quart, Jour. Geol. Soc., ii, 82; read be- 
fore the Geol. Soc. of London, Dec., 1845.)—Mr. Bunbury in a’short 
memoir describes three species of ferns from Frostburg, two of which 
are figured. The first is supposed to be identical with the Diplazites 
emarginatus of Géppert. Mr. Bunbury : shows that the genus Diplazi- 
tes is founded on an error, and proposes’ to retain the species for the 
_ Present in the genus vain agen arp cagemtIe: of which he gives 
the following description: 
 P. fronde @ pinnata (?): pinnis aes obtusis Jaté et obfusissimé crenatis; basi 
subcontractis ; costa valida apice attenuata; vyenis coste subperpendicularibus pin- 
hatis; venulis yaldé obliquis, rotten in angulum acutum confluentibus; soris ro- 
tundis confertis i inter venas biserialibus. 
‘The Second species is described as new, and named Pecopteris el- 
liptca 
Description, P. fronde bi anaid Sade ellipticis oblongisque convexis inte- 
gerrimis apice Fanti basi contractis discretis remotiusculis ; venis obliquis pro- 
pe sonia fences; soris subrotundis confertissimis. It is stated to be near the P. 
