. Acadian geology : the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island. Geology -- New Brunswick; Geology -- Nova Scotia; Geology -- Prince Edward Island; Paleontology -- New Brunswick; Paleontology -- Nova Scotia; Paleontology -- Prince Edward Island. 204 THE CARBONIFEROUS SYSTEM. (1.) Naiadites (Anthracoptera) carbonaria (Dawson)—Fig, 42.— Hinge-line straight, more than one half the length of the shell; beak Fig. 42. Figs. 42 to 46.—Species of Naiadites. Fi£?. 43. Fig. acute, in the anterior fourth of hinge-line ; ant
. Acadian geology : the geological structure, organic remains, and mineral resources of Nova Scotia, New Brunswick, and Prince Edward Island. Geology -- New Brunswick; Geology -- Nova Scotia; Geology -- Prince Edward Island; Paleontology -- New Brunswick; Paleontology -- Nova Scotia; Paleontology -- Prince Edward Island. 204 THE CARBONIFEROUS SYSTEM. (1.) Naiadites (Anthracoptera) carbonaria (Dawson)—Fig, 42.— Hinge-line straight, more than one half the length of the shell; beak Fig. 42. Figs. 42 to 46.—Species of Naiadites. Fi£?. 43. Fig. acute, in the anterior fourth of hinge-line ; anterior margin abruptly rounded ; ventral margin nearly straight, with a slight sinus ; posterior margin broad and regularly rounded; shell thin, with distinct growth lines. When recent, the shell was probably somewhat tumid, but is usually flattened, and often much distorted by pressure, so that it is very difficult to obtain a specimen sufficiently perfect to be described or figured. Length of adult, an inch or more. This is the most abundant species in the Coal measures of the Joggins, beds of some thickness being often almost entirely made up of the valves. Fig. 31, p. 182 supra, represents an imperfect and distorted specimen. See also Fig. 22 in my paper on the South Joggins in the Journal of the Geological Society, vol. x. p. 39. This shell may possibly be the Modiola Wyomingensis of Lea (Joum. Ac. Nat. Science, 2d series, vol. ii.); but if so, his specimen is imperfect. (2.) Naiadites [Anthracoimja) elongata (Dn.)—Fig. 43.—Smaller than the preceding, and more elongated laterally; the beaks obtuse and more anterior; the hinge-line nearly straight and less than half the length ; ventral margin slightly compressed ; length, half an inch to an inch; common at the Joggins and Sydney, in the Middle Coal measures. See Fig. 23 in paper above cited. (3.) Naiadites {Anthracopte7~a) laevis (Dn.)—Fig. 44.*—Broad ovate, extremely thin; beak about one-third of distance fr
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