Cerion (Strophiops) lucayanorum Clench, 1938

Original Description

"Description. Shell heavy, ribbed, cylindrical and imperforate. Color a flat white, an occasional specimen tinged a pale, pinkish brown throughout. Whorls 11-11½ later whorls parallel sided, early 7 whorls forming an acute cone. Aperture subcircular, tinged brown­ish within the throat. Spire produced, acute, forming an angle of 72° (holotype). Parietal tooth centered, following backwards nearly half a whorl. Columellar tooth situated low on the columella and following backwards about two whorls forming a slight twist to the columella at the floor of the whorls. Palatal lip reflected, beveled or collared (about 1-1½ mm.). Parietal callous thickened but not built forwards to form a parietal ridge. Sculpture of rather nume­rous coarse ribs, starting on the earliest whorl beyond the nuclear whorls. The nuclear whorls are glass-like and opaque, and they oc­casionally have these costae or ribs faintly indicated. These ribs vary from 25-30 on the body whorl. Sutures slightly indented. Um­bilical area deeply excavated, with a strongly incised but closed rimation.

Length                         Width               Aperture

34.2                             12                    8.2 X 6.5 mm.              holotype

30.2                             12.8                 8.8 X 6.5   "                 paratype

3l.3                              12.8                 8.2 X 7      "                      "

32.2                             13                    8    X 6.8   "                      "

32.1                             13.1                 8.6 X 7.1   "                      "

Holotype. Mus. Comp. Zoöl., no. 116,017, N. W. portion of Mores Island, 32 mi. N. W. of Southwest Point, Great Abaco Island, Bahama Islands. W. J. Clench, J. C. and G. Greenway collectors, April 13, 1936. Paratypes from the same locality. A large additional series from this island was collected for us by Don Waters in 1937.

Remarks. This species is closely related to C. maynardi P. & V. from the southern tip of Great Abaco Island. It differs from this species in being more attenuated in proportion to its width, possess­ing more numerous ribs and in having a less thickened lip. From C. abacoense P. & V. it differs in its greater proportionate attenua­tion and the less thickening of the lip. The ribs on the body whorl of C. lucayanorum are less in number as there are 31 to 38 on aba­coense as defined by Pilsbry (loc. cit., p. 249). From C. chrysaloides, known only from Eight Mile Rock, Grand Bahama Island, it differs by being very much larger and possessing more ribs on the body whorl (the three paratypes of chrysaloides received from Plate vary from 17-19 ribs.)." (Clench, 1938:326-326).

 

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