Articles liés à Manual of Conchology; Structural and Systematic. with...
Manual of Conchology; Structural and Systematic. with Illustrations of the Species. Second Series: Pulmonata Volume 12 - Couverture souple
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Ml A .MANUAL OF CONCHOLOGY. Vol. JLII BUL1MUL1DJE. Genus DRYMEUS A lbers. (C ontinued.) II. SPECIES OF THE WEST INDIES, TRINIDAD AND FLORIDA. With the exception of D. undulatus and D. elongatus and its immediate allies, the Drymczus species of this area form a homogeneous group, undoubtedly derived from the group of allied forms in Venezuela and the adjacent region, which has the same characters. There are also a few species in eastern Mexico belonging to the same group. While some of the species have the expanded lip of typical Drymcem, others have no perceptible expansion, and would technically be classed in Mesembrinus ;but the distinction here is purely artificial, and had better be disregarded. With an identical pattern of sculpture, the various forms show gradations in texture from the excessive fragility of D. dominicus to the solidity of D. liliaceus. In the more fragile forms, the upper whorls of the spire usually exhibit an excessively dense and minute granulation, below the grated apical portion. The land snails of the Lesser Antilles are in large measure peculiar to the region ;and though there are conspicuous exceptions, the localities on the mainland of South America which authors quote for them are to be received with great caution. There can be no doubt that many such records which have been copied by Pfeiffer in the Monographia, and thence by Mr. Smith in some of his valuable Antillean lists, were based upon errors of determination or false locality labels. Drouet has been particularly unfortunate in the introduction of such errors, and except where the extrinsic evidence corroborates the statements in his Terrestrial and Fluviatile Mollusks of French Guiana, I do not consider them worthy of quotation.
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