. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. 054 THE DEVONIAN PERIOD. at right finglcs to the rachis, obtuse, narrow toward the extremity, suddenly >videned or almost auricidatc at the lower side; midrib ex- tending to the apex; nerves few, at a somewhat acute {xnglc. Alrthnptcris Pcrlci/i, Ilartt (Fig. 192, M). " species resembles Aletliopteris scrrula of Lesqx. It ditVcrs from it in the f
. Acadian geology [microform] : the geological structure, organic remains and mineral resources of Nova Scotia, New Brunswick and Prince Edward Island. Geology; Paleontology; Geology; Geology; Geologie; Paléontologie; Géologie; Géologie. 054 THE DEVONIAN PERIOD. at right finglcs to the rachis, obtuse, narrow toward the extremity, suddenly >videned or almost auricidatc at the lower side; midrib ex- tending to the apex; nerves few, at a somewhat acute {xnglc. Alrthnptcris Pcrlci/i, Ilartt (Fig. 192, M). " species resembles Aletliopteris scrrula of Lesqx. It ditVcrs from it in the following points:—The pinnai are wider and closer, and not so h)ng; the pinna; arc usually tridentate. The teeth acuminate, the middle one .some- times emarginate. The vein Is three-forked, sending a vcinlet into each lacinia. The middle veinlet branches iu the midillc lacinia. In A. serrula the pinnules, or, as Lesqx. terms them, the lobes, are united more than Iialf the way up. A. Perlftji has the pinnules united only one-third of the way ; and whereas in the former they arc divided by a sharp gash, in the latter they are divided by a deep rounded sinus. "Dedicated to the hitc M. IT. Perley, Es([., Commissioner of Fisheries and Vice-President of the Natural History of St ; [Incerki! scdls.) Cardiocarpum cormitum, (Fig. 194, A). Broadly ovate, emarginate at base, dividing into two indexed processes at top. A mesial line proceeds from the sinus between the cusps, downward. Nucleus more obtuse than the envelope, and acuminate at the top. Surface of the flattened envelope striate, tliat of the nucleus more or less rugose. Length about seven lines. Numerous in .shale near St John. The specimens are all perfectly flattened, and many of them are also distorted, being elongated or .shortened according to the direction in which they lie in the shale. The nucleus constitutes a strongly shaded spot of graphite. The flattened envelope appears as a less di
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Keywords: ., boo, bookcentury1800, booksubjectgeology, booksubjectpaleontology
