﻿JURASSIC AND TRIASSIC BRACHIOPODA. 



91 



' Quarterly Journal of the Geological Society/ vol. xxiii, p. 500, 1867, Mr. C. Moore 

 records this species from the Middle Lias of Whatley ; but as he has mislaid the specimen 

 upon which his identification was effected, I cannot do more than repeat his statement. 



25. Crania liassica, Moore. ' Quarterly Journal Geological Society,' vol. xxiii, p. 539, 



1867. 



Mr. Moore did not figure his species, but described it in the following manner : 

 " Shell rather small, subquadrate, concave, with a rather elevated obtuse vertex ; 

 shell-structure smooth ; surface with a very irregular wrinkled aspect. 



" Fragments of this little Crania are not uncommon ; but I have only one moderately 

 perfect, showing the exterior, which is from the Brocastle Liassic conglomerate. It occurs 

 also (but fragmentary) in the Charterhouse Liassic mine in the Lower Lias at Stout's 

 Hill." I regret not having been able to see the specimens upon which this species has 

 been founded. They have been mislaid by Mr. Moore. In his paper in the ' Geological 

 Magazine/ vol. vi, p. 553, December, 1869, Mr. R. Tate refers this species to the zone 

 of Am. angulaius. 



Second Division — Clistenterata (King), genera destitute of an anal aperture. 



Genus Lept.ena, Balman. 



26. LeptjEN a Davidsoni, E. Beslong. Sup., PI. X, figs. 27 — 29. 



Lept/ENa Davidsoni, Eng. Desl. Memoires de la Soc. Linn, de Normandie, vol. ix, 



figs. 1, 2, 1853. 



— — Moore. The Geologist, vol. iii, p. 445, pi. xiii, figs. 21, 22, 



1860. 



Spec. Char. Shell involute, transversely semicircular, wider than long ; ventral valve 

 regularly and uniformly convex, with lateral auricular expansions. Dorsal valve concave, 

 following the curve of the other. Surface smooth, or marked here and there with fine 

 concentric lines of growth. Hinge-line straight. Area narrow in dorsal valve, wider in 

 ventral one, fissure and deltidium rather wide and perforated at extremity under the 

 small incurved beak by a minute circular aperture or foramen. The valves articulate by 

 the means of teeth and sockets. 



