Monograph of the Genus Strophia; A Group of Tropical and Sub-Tropical Land Shells Volume 1, No. 1

Monograph of the Genus Strophia; A Group of Tropical and Sub-Tropical Land Shells Volume 1, No. 1

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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. 1889 edition. Excerpt: ...seem) as they may, here we have in this Strophia a fine example of the changing of one species into another, and also very clearly shows how careful we, of to-day, must be in recording all the steps of change in order that future generations may benefit by our researches. The typical Changing Strophia may be at once recognized by the dark color, white, and numerous striations. HABITS AND DISTRIBUTION. I found the Changing Strophia on March 29, 1893, clinging to shrubs along the rocky, northern shore of the western half of Long Key, an island that lies about a mile east of Hog Island. I traced the shells westward along the shore as far as the little bay on which the Marine Hospital stands and eastward to a sand beach about midway on the key. They were not found more than a few yards back from the water's edge. As the weather had been very dry all of the shells were fixed and hybernating. 34 STROPHIA ALBEA Novo. Pink Strophia. FIG. 38. A, front view; B, side view of type. DESCRIPTION. SP. CH. Size, rather small. Shell, quite thick and heavy. Striations, present. Whirls, nine. Examined forty specimens. Form of shell: 1. pointed cylinder, the first whirl being the largest, then each successive whirl is a little smaller to the fourth whirl, then the FIG. 33. shell slopes gradually to the top, forming an angle of forty-five degrees. The striations are numerous, twentyfive to the first whirl, are not prominent, but are very regular, appearing like little half cylinders laid against the shell; they are thus rounded, and are highly polished, without any furrows whatever. and are about one half as wide as the B A interspaces between them. Strophia. albea. A, front 'iew, B, side Aperture rather small, slightly View onyw ' contracted more

Product details

  • Paperback | 70 pages
  • 189 x 246 x 4mm | 141g
  • United States
  • English
  • black & white illustrations
  • 1236744152
  • 9781236744159