Annual Report of the State Geologist

Annual Report of the State Geologist

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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. 1900 edition. Excerpt: ...less closely the posterior three-fourths of the disk; these are often wanting, especially in old specimens; lunule long, narrow; ligament long, thin, light horn-color; hinge margin nearly straight or very slightly arcuate; umbones prominent, approximate, concentrically wrinkled, the wrinkles being angulate and the apices of each pointing toward apex of the umbone, light, nearly white, in color, when the epidermis is perfect; cardinal teeth double in both valves, equal only in the left valve, rather small, thin, acutely serrate, all directed anteriorly; lateral teeth long, thin, lamellar, striate, nearly or quite straight; dorsal plate smooth, short, rounded, thin; anterior cicatrices distinct, that of the adductor rather deep, large, striate, irregularly impressed, that of the protractor pedis well impressed but not deep; posterior cicatrices confluent, very slightly impressed, smooth, iridescent; pallia! cicatrix well impressed before, broad and shallow, or scarcely impressed, behind; dorsal cica trices numerous, impressed as deep pits in an irregular row in the center of the cavity of the beaks; cavity of the beaks rather shallow; nacre pure white, sometimes somewhat iridescent posteriorly. This form is widely distributed throughout the central west, and is not only abundant but is frequently the only form found. It is usually of a darker color when it inhabits muddy river beds. The females are the most numerous and the most variable in outline, which fact accounts for their use in the several descriptions of shells that now form synonyms of this species. Mr. Barnes has described the large and swollen female, such as is often found in the Wabash and the Ohio, under the name of Unio siliquoidem. The original description of Lamarck was as...
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Product details

  • Paperback | 394 pages
  • 189 x 246 x 21mm | 703g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236660951
  • 9781236660954