The Terrestrial Air-Breathing Mollusks of the United States, and the Adjacent Territories of North America Volume 2; Described and Illustrated. Amos Binney
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. 1851 Excerpt: ...the depression behind the lip not visible. The color of the aperture, in some recent specimens, is delicately roseate. The general aspect of this species is somewhat like that of a Helicina, It is a pretty, and very distinct species. 35. Helix Saxicola, Pfeiffer. Plate XXIX. a. Figure 4.. H. testa depresso-conica, tenui, brunnei, oblique striata, umbilicata; anfractibus quatuor cum dimidio arcte spiratis; labro acuto, tenui; apertura orbiculari, campanulata. SYNONYMS AND REFERENCES. Helix saxicola, Pfeiffer, Wiegm. Arehiv. 1840, I.251. Monoy. Helic. Viv. I. 87. Helix-mauriniana, D'ore. in Sagra's Cuba, I. 162, t. 8, f. 20-23. DESCRIPTION. Shell minute, planorboid, smooth, horn-colored; spire slightly elevated, composed of four or five wellrounded whorls separated by a deeply impressed suture; beneath, with a broad, umbilical pit, one-third the diameter of the shell, exhibiting all the whorls within. Aperture circular, being but slightly impinged upon by the penult whorl, across which passes a slightly appressed scale of enamel, rendering the lip continuous; lip slightly reflexed, so as to render the aperture somewhat campanulate. Diameter about one-eighth of an inch; height about half as much. Geographical Distribution. Found at Galveston, Texas, by Mr. Bartlett, but was probably introduced from Cuba, where it appears to be not uncommon. Remarks. This shell might at first be taken for a small Planorbis, rather than a Helix. It is closely allied to H. rupestris of Europe, but is somewhat larger. It bears a closer resemblance to H. lineata than to any other North American species. Its circular, campanulate aperture, almost disconnected with the preceding whorl, is one of its most striking peculiarities.--g. 36. HELIX PITLCHELLA, MtHlER Plate XVII. Figure 1. H....
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