﻿SCOLIOSTOMA. 231 



1. Scoliostoma tkxatdm, Munster sp. PI. XXIII, figs. 7 — 9. 



1840. Tubbo texatus, Munster. Beitr., pt. 3, p. 89, pi. xv, fig. 22. 



1841. — — Phillips. Pal. Foss., p. 95, pi. xxxvii, fig. 175. 



? 1850. — ctclostomotdes, F. A. Homer. Beitr., pt. 1, p. 3(5, pi. v, figs. 23 a, b. 

 •1853. Scoliostoma megalostoma, Sandberger. Verst. Ehein. Nassau, p. 224, 



pi. xxvi, flgs. 2, 2 a, 2 b. 



1853. — CEASSILABEUH, Sandberger. Ibid., p. 223, pi. xxvi, figs. 1, 



1 a — -c. 



1854. Veemetus texatus, Morris. Cat. Brit. Foss., p. 285. 



? 1884. Tubbo ciclostomoides, Clarke. Neues Jahrb. f. Min., Beil.-Baud iii, 



p. 351. 



1888. Scoliostoma texatum, Etheridge. Foss. Brit., vol. i, Pal., p. 165. 



1889. — — Wliidbome. Geol. Mag., dec. 3, vol. vi, p. 30. 



Description. — Shell small, irregularly spiral, acuminate, of five or six 

 volutions, having the body- whorl deflected and bent back upon itself, so that 

 the mouth is irregularly placed. Spire conical, rather elongate, with broad, 

 slowly increasing whorls. Suture small but definite, and rather deep. 

 Whorls moderately convex. Body-whorl beginning as regularly as the other 

 whorls, but twisting suddenly back and over, so that the mouth occupies a 

 sinistral position about halfway up the spire. Ornamentation reticulate, con- 

 sisting of a series of rather distant, sharp, narrow, spiral ridges (seven or eight on 

 the penultimate whorl), crossed by similar and similarly distant, nearly straight 

 and rather oblique longitudinal ridges, so as to form hollow tesserae with knotted 

 corners. Mouth regularly oval, with entire margins, which are thickened so as 

 to be patulous externally. Umbilicus small, deep. Base of whorls rounded. 



Size. — Height 17 mm., width 12 mm. 



Localities. — From Wolborough there are four specimens in the Godwin-Austen 

 Collection in the Museum of Practical Geology, some of which admirably preserve 

 the markings ; one fragmentary example in Mr. Vicary's Collection ; one specimen 

 which shows its peculiar form, but is destitute of markings, in the Battersby Collec- 

 tion in the Torquay Museum, and two minute specimens in the same museum 

 about 3 mm. long. From Lummaton (?) there is one very poor specimen in the 

 Bristol Museum. 



Remarks. — This is an exceedingly well-marked species, though possibly some- 

 what variable in the elevation of the spire and the convexity of the whorls, as is 

 seen by a careful comparison of the above specimens. It is to be noted that one 

 of the specimens in the Museum of Practical Geology is on the same slab with a 

 small Pleurotomaria, which must not be confused with the present shell. One of 



