Bulletin Volume 28-29

Bulletin Volume 28-29

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: ...reflection is very large, and bears one stout median cusp, extending almost to the lower edge of the base of attachment; there is also an outer, much smaller side cusp, and a less developed, sometimes subobsoiete inner side cusp; all the eusps have distinct cutting points, proportioned to their size, that on the central cusp being greatly developed. In 8. decollata (Terr. Moll., V, Plate IV, Fig. Q) the inner cutting point is also much developed and joined to the central cutting point. The marginal teeth in 8. decollata (b) are but a modification of the laterals, with the suppression of the inner cusp and cutting point; the extreme marginals (c) differ in the greater development of the reflected portion and equalization with it of the cutting points, of which there are but two (see also below). In 8. subula (Terr. Moll., V, Plate IV, Fig. P) the marginal teeth (b) have more numerous cutting points, formed by the bifurcation of the inner and outer cutting points. The second denticle from the inner side is the largest (see Fig. 470). It will be noticed that in S. decollata both the side cutting points of the laterals are quite thorn-shaped. Subgenus RtJMINA, Risso. Animal heliciform, blunt before, pointed behind; mantle posterior, thin, protected by a shell; respiratory and anal orifices on the right of the mantle, under the peristome of the shell; generative orifice behind the right eye peduncle; no locomotive disk; no canAnimal of Stenogyra decollate. U1UCUS pore. Shell obsoletely rimate, calcareous, normally truncated, cyliudrically elongate; remaining whorls 4-6, the upper truncated ones 8-10, the upper one globular; aperture semi-oval; peristome straight, thickened within, its margins connected with callus, the columella twice as short...show more

Product details

  • Paperback | 348 pages
  • 189 x 246 x 18mm | 621g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236812174
  • 9781236812179