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SUPPLEMENT TO THE BRITISH 



interior of the dorsal valve there is a narrow hinge-plate with a cardinal process in its 

 centre. Loop very imperfectly known. Shell-structure punctated. Dimensions 

 variable ; a large example measured, length 2, breadth 4 lines. 



Obs. — The genus to which this and the following species should be referred is still a 

 matter of conjecture. It was at first supposed to be referable to Argiope, but, as there 

 exists no submarginal septa for the attachment of a two- or four-lobed loop, it was 

 subsequently removed from that genus by Mr. Deslongchamps, and placed provisionally 

 into Megerlia ; but this is also merely a guess, for no sufficiently developed mesial septum 

 for the attachment of any portion of the loop is observable. After breaking a number of 

 specimens, all I could find of the loop was a small portion of the riband-shaped lamella 

 and crural process which I have drawn in fig. 3, and which is not sufficient to allow 

 us to conjecture what may have been its complete condition, and consequently the 

 genus or subgenus to which it should be referred. Externally M. {?) Suessi bears some 

 resemblance to Argiope, but its interior is very distinct. I also observed in the interior 

 of some dorsal valves two largely developed muscular impressions (fig. 6), surrounded 

 by a well-marked ridge, and divided along the middle by a narrow longitudinal 

 elevation. The species is provisionally placed in the genus Terebratula. 



Position and Locality. — This very small and elegant shell was found for the first 

 time by Mr. E. Deslongchamps in the Lias of May and Bretteville-sur-Laise (Calvados), 

 France, where it is abundant, although difficult to collect on account of its very small 

 dimensions. In England it was found by Mr. C. Moore in the Middle Lias or Zone of 

 Ammonites margaritalus, at Whatley, near Erome, in Somersetshire. 



78. Terebratula (?) Perrieri, E. Desl Sup., PI. XIV, figs. 1, 2, 3. 



Argiope Perrieri, E. Desl., Annuaire de l'lnstitut des Provinces pour 1853, et 

 Annuaire id. pour 1854, p. 18, pi. i, figs. 5 and 7, 1855. 



— — Oppel. Die Jura-Formation, p. 263, No. 82, 1856. 



■ — — Suess. Classific. der Bracb. von Th. Davidson, p. 58, pi. ii, fig. 



4 a, b, c, 1856. 



Megerlia — E. Desl. Mem. de la Soc. Linn, de Normandie, vol. x, pi. xlv, 1856. 

 Terebratula (Megerlia) Perrieri, E. Desl. Pal. Franc., Brach. Jur., p. 146, 



pi. xxxv, figs. 1 — 10, 1863. 

 Argiope Perrieri, C. Moore. Quarterly Journal Geol. Soc, vol. xxiii, p. 479, 1867. 

 Megerlia — R. Tate. Geol. Mag., vol. vi, p. 551, 1869. 



Spec. Char. — Shell small, transverse, obscurely pentagonal, hinge-line straight ; lateral 

 expansions elongated and acutely acuminated. Ventral valve convex, with a large wide 

 central rib or fold, and five or six rounded or slightly angular ribs on each of the lateral 

 portions of the valve, beak almost straight ; area triangular and wide, foramen 



