LIOTIA. 
271 
massive shell-structure. The genus is described as beginning in the Trias, but 
the shell described below is so similar to some of the modern forms that both 
Mr. Edgar A. Smith and myself independently referred it to this genus. 
Neritopsis, Grat., is the only other genus which it approaches, but it differs from 
that in not having a reticulated surface. 
1. LioTiA BREvis, Soiverby, sp. PI. XXVI, figs. 8, 8 a, 9. 
1827. BxrcciNTJM breve, Sowerhy. Min. Conch., vol. vi, p. 128, pi. dlxvi, fig. 3. 
1841. Macbocheiltjs beevis, Phillips. Pal. Foss., p. 102, pi. xxxix, fig. 193. 
1849. — Phillipsii, cVOrhigny. Prodrome, vol. i, p. 63. 
1849. MiTECHisoNiA beevis, d'Orhigny. Ibid., vol. i, p. 70. 
1854. Maceocheilus beevis, Morris. Catal. Brit. Foss., p. 256. 
? 1889. TuEBo ScHWELMENSis, Kayscr. Zeitschr. deutsch. geol. GeselL, p. 289, 
pi. xiii, figs. 1, 1 a, 1 &. 
Description. — Shell large or small, massive, more or less depressed, turbinated, 
of few whorls. Spire of four rapidly increasing whorls. Suture deep, narrow, 
facing upwards, complicated by the ornament. Apex acute. Upper whorls 
obliquely flat, being more than half enveloped by the succeeding whorls. Body- 
whorl forming a wide oblique semi-ellipse. Ornament consisting of two or three 
spiral rows of large, sharp nodules, set on elevated rounded spiral bands, which are 
divided by more or less distinct shallow furrows ; the nodules being also trans- 
versely arranged in rows, which slope slightly backwards from the suture, and, 
when worn, are seen to result from the lines of growth. Mouth large, subtriangular 
externally, subcircular internally, with sharpish, bevelled outer lip. Shell- 
structure very thick. Inner lip almost straight, swollen externally, so as to fill, 
but not to cover, the umbilicus. Upper extremity of mouth externally pointed. 
Base of shell ornamented with two or three low spiral ridges. 
Size. — A perfect specimen in Mr. Vicary's Collection measures 18 mm. in 
height and 23 mm. in width. A specimen in the Torquay Museum measures 
30 mm. in width. Most of the specimens, enumerated below, are much smaller. 
Locality. — Chudleigh. There are twelve specimens in Mr. Yicary's Collection ; 
four in the British Museum (labelled " Barton," but shown by their mineral 
condition to be evidently from Chudleigh) ; one in the Woodwardian Museum ; 
a poor fragment of the spire in the Godwin-Austen Collection ; and a very large 
specimen of the body-whorl in the Torquay Museum. The last specimen, 
though unlike most of the Chudleigh shells in mineral character, is so similar to 
the Woodwardian specimen that it evidently came from the same locality. 
BemarJcs. — Most of the specimens of this beautiful and highly ornamented shell 
