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Taxon profile

species

Cylichna verrillii W. H. Dall, 1889

kingdom Animalia - animals »  phylum Mollusca - mollusks »  class Gastropoda - gastropods »  order Opistobranchia - opisthobranchs »  family Cylichnidae »  genus Cylichna

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Cylichna verrillii

Author: Lee, H.G.

Cylichna verrillii

Author: Dall, W.H.

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Description

Shell similar to C. alba Brown in size and form with the exceptions follow¬ing. It is bluish white and never has the brown outer coat of C. alba, though the extremely thin epidermis sometimes shows a light brown line marginating the apex. It is covered all over with fine spiral striae. The columella is thickened and twisted more than occurs in C. alba, and in C. Verrillii has the effect of an incipient plait. Lastly the aperture extends farther behind the spire than in C. alba, and, instead of the margin being curved over to a slight callus sealing the apex, there is a well marked perforation, most marked in the adult shells. Largest specimen 7.5 long by 3.0 mm. wide.
Source: Dall, 1889. Reports on the results of dredgings, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877-78) and in the Caribbean Sea (1879-80), by the U. S. Coast Survey Steamer 'Blake,'. (Original description)

Interchangeable taxa

This species is larger and more cylindrical than C. umbilicata of Europe. It is nearer G. cylindracea var lineata, but is shorter in proportion to its width, and its body is also shorter in proportion to the whole length and more obliquely attenuated to the columella. It has a striking similarity to C. alba, when decorticated, until closely examined.
The other species common to the region are C. auberi Orbigny, C. occulta Mighels, and perhaps C. cylindracea Pennant, specimens of which were received from Cuming as from the Antilles (?). C. krebsii Morch would seem to be suspiciously near C. alba, but I have seen no specimens, and the locality (Anguilla, etc.) seems very far south for that species. The suspicion arises that the specimens may have been derived from ballast thrown overboard by New England trading craft or New York fruit-carriers.
Source: Dall, 1889. Reports on the results of dredgings, under the supervision of Alexander Agassiz, in the Gulf of Mexico (1877-78) and in the Caribbean Sea (1879-80), by the U. S. Coast Survey Steamer 'Blake,'.

Distribution

Off the coast of North Carolina. USA.
Author: Jan Delsing

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