Coleman Sellers on the Globe Lens, etc. 319 
deposits in Maine. In the meantime, therefore, we may be con- 
tent to regard the upper members of the series as belonging t 
the later part of the Devonian Period, leaving the lower mem- 
_ to be regarded as Lower Devonian or possibly Upper Si- 
urian, 
tee gentlemen of St. John, who, under the guidance of Messrs. 
atthew and Hartt, have diligently explored every accessible 
i within some distance of the city, and have liberally placed 
tir collections at my disposal for the purposes of this paper. 
Dadoxylon Ouangondianum Dawson. ; Cyclopteris obtusa Geppert. 
singe palpebra, sp. nov. | —— varia, sp. nov. 
“gmaria ficoides (var.) Brongn, —— valida, s 
Calamites Transitionis Geppert. | Neuropteris serrulata, sp. nov. 
1, “aaneformis Brongn. | ——— polymorpha, sp. nov. 
Asterophyllites acicularis, sp. nov. ' Sphenopteris Heeninghausi Brongn. 
— latifolia, sp. nov. ——— marginata, sp. nov. 
~— scutigera, sp. noy. —— Harttii, sp. nov. 
— longifolia Brongn. — Hi a, Sp. nov. 
wso Hymenophyllites Gersdorffii Gappert. 
ee ta, sp, nov. Ky 
nophyllum antiquum Dawson, —— curtilobus, sp. nov. 
Plonatset dlenetane* sp. nov. Pecopteris (Alethopteris) discrepans, sp. 
Le €ndron Gaspianum Dawson. nov. 
Yeopodites Matthewi Dawson. — ot ingens, sp. nov. : 
SUophyton elegans, sp. nov. —— (——) obscura (?) Lesquereuz, 
~~ glabrum, sp. nov. Trichomanites, sp, nov. 
Cordaites Robbii Dawson Cardiocarpum cornutum, sp. nov. 
~— angustifolia Dawson. obliquum, sp. nov. 
Cyclopteris Jacksoni Dawson. | Trigonocarpum racemosum, sp. nov. 
(To be continued). 
a 
Arr. XXXII.—On the nature and advantages of the Globe Lens 
Jor the Photographie Camera ; by COLEMAN SELLERS, 
‘HE Globe Lens for oer ie mee cameras, patented by Messrs. 
Harrison and Schnitzer of New 
a iscovery of the use of collodion, seemed to leap into its present 
. high position at one bound, at least so far as the chemistry of 
