Transactions; Together with the Proceedings for the Same Year[s] Volume . 11-12

Transactions; Together with the Proceedings for the Same Year[s] Volume . 11-12

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1911 edition. Excerpt: ...more strong. narrow. sharp ribs. which. in some speci-mens, are ornamented with two or three rows of tubercles; ribs more elevated on the convex side of the shell; ventral margin strongly dentate. The specimens collected from the Bnda have not attained such vigorous development as those from the Georgetown. Locality.--Shoal Creek, Austin. Texas. Ja/nira Ywrightii Shumard, 1860, Trans. Acad. Sci., St. Louis, Vol. I, 1856-1860, p. 607. Vola (J0/nira) uiright-ii Hill, 1889, Geo. Surv. Texas, Bull. No. 4, p. 8. ' i Vola wrighti-i Cragin, 1892, Fourth Ann. Rept. Geo. Surv. Texas, p. 217, Pl. 32, figs. 2, 3. Dimensions.--Length, 22mn1.; height-28mm. ();-jg-"411 dag-C;-jpfj0;;.--Shell ovate-subtrigonal, longest diameter from beak to base; superior valve flat or slightly concave, marked with three strong, rounded, plications, which are prolonged at the base into prominent angles; inferior valve strongly convex; anterior and posterior slopes abrupt, margins straight and diverging from the beak at an angle of about 40; surface ornamented with four very prominent, simple radiating ribs or folds on the body of the shell, and one much less developed within the margin on either side. Both valves are also elegantly marked with crowded, strongly waved concentric, filiform strie; beaks elongated-slender. incurved; wings unknown. D-imen.s-iions.--(reatest length, 35mm.; greatest breadth, 27mm. Descript-ion.--Slu-ll variable, ineqnilateral. inequivalve. oblique. Inferior valve the larger, ventricose. produced, orna mented exteriorly with faint costae and thin lamellae; interior with fine, flat, wavy, radiating costaa, separated by grooves of equal width. Superior valve convex, ornamented with many, irregular, wavy, radiating costaa, eight of which are more

Product details

  • Paperback | 64 pages
  • 189 x 246 x 3mm | 132g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236635833
  • 9781236635839