Cerion (Strophiops) paucicostatum Clench 1934

Original Description

"Cerion (Strophiops) paucicostatum, s. nov.

Plate 2, figure E.

Description. - Shell cylindrical, elongated, ribbed with the umbilical rimation closed to partially perforate. Color flat white to mottled brownish and blackish gray. Whorls 11 to 11 3/4, first 1 1/2 to 2 1/2 whorls opaque and glasslike, remaining whorls producing a somewhat extended cone. Spire rather variable, producing an angle of approximately 64(. Aperture subovate and rather small for the size of the shell. Parietal tooth strongly developed, about twice as long as high. Columellar lumella much smaller than the parietal tooth, inclined rather sharply upwards and placed rather high on the axis. It continues at the base of the axis for a full whorl. Occasionally the coarse ribs show through on the parietal wall. Lip sharply reflected but not particularly thickened. Parietal ridge of the lip not very strong though generally present. Suture well defined but not indented. Sculpture of heavy, rather widely spaced ribs varying from 11 to 15 on the body whorl. Nuclear whorls very faintly ribbed.

M eaaurements.

Length

Width

Aperture length

Aperture width

33.1

13.2

8.3

6.0  mm.

Holotype

32.5

14.0

8.0

6.0

Paratype

33.6

12.2

8.0

6.1

"

32.6

11.7

7.8

5.9

"

32.0

12.6

8.0

6.2

"

33.0

13.0

8.2

6.0

"

34.2

12.5

8.2

6.2

"

32.0

14.0

8.2

6.0

"

31.0

13.6

7.5

6.1

"

29.6

13.6

7.5

6.0

"

 

(Clench, 1934:209-210)
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