ORTHIS. 145 
Locality.— A single specimen is in my Collection from Lummaton. 
Remarks.—Whether this is a variation of O. striatula or a distinct species is 
not clear from the specimen, which is defective all round the margins. The strize 
are similar to those in that species, except that there are no signs of spines ; 
their grouping, however, gives it a distinct character, which suggests a relation- 
ship to the genus Meekella.’ 
8. Ortuis Hiriiensis, de Verneuil. 
1850. Orruis Erreiensts, de Verneuil. Bull. Soc. Géol. Fr., ser. 2, vol. vii, p 161. 
1868. —  saccuLus, Dames. Zeitsch. Deutsch. Geol. Gesell., vol. xx, p. 499. 
1882. —  Er.rensts, Davidson. Brit. Foss. Brach., vol. v, pt. 1, p. 50, pl. 
ii, figs. 16 a—e. 
1882. —  Enrrepiensis, Barrois. Mém. Soc. Géol. Nord, vol. ii, p. 235. 
Locality.—I have fourteen specimens of this shell from Lummaton, and there 
is another very fine example in the Torquay Museum. 
Size— Length 11 mm., width 13 mm., depth 4 mm. 
Remarks.—I have nothing to add to Davidson’s description of this shell. 
Orthis venustula, Barrande,’ is rather closely akin, if not identical. 
4, ORTHIS PULCHERRIMA, n. sp. Pl. XVII, figs. 6, 6a, 6b. 
Description.—Shell transversely oval, convex, almost equivalve. Hinge-line 
straight, much shorter than the width of the shell. Beaks prominent, almost 
equal, much incurved and rounded, that of the dorsal valve being proximate, and 
that of the ventral valve being separated from the hinge by a broad triangular 
area. Valves nearly equal, gibbous and prominent near the beaks, and slightly 
convex toward the other margins, where they meet at a small angle. Front 
margin of the ventral valve depressed by a slight continuous sinus. Surface 
covered with about twenty-five large sub-triangular elevated ribs, separated by 
similar interspaces, the whole apparently being crossed by transverse striz or 
growth-lines. 
Size.— Length, 15 mm.; width, 19 mm. ; height, 10 mm. 
Locality.—Lummaton. A single specimen is in my Collection. 
Remarks.—This specimen is undoubtedly distinct, and is certainly new to our 
Devonshire list. It is at once distinguishable by its sub-equal valves and beaks, 
1 1868, White and St. John, ‘Trans. Chicago Acad. Sci.,’ vol. i, p. 120, figs. 4—6. 
2 1879, Barrande, ‘Syst. Sil. Bohém.,’ vol. v, pl. Ixiv, fig. 4, 1-29, Et. E. 
VoL, Il. 19 
