64 MOLLUSCA FROM THE GREAT OOLITE. 



CARDIUM STRICKLANDI. Tab. VII, fig. 5, 5a. 



CAKDIUM STRIATUM. Geol. Chelt., J. Buckmann and H. E. Strickland, 1845, p. 97. 



Testa suborbiculari aquilaterali, ventricosd, umbonibus mediants, contiguis, marginibus, 

 arcuatis ; latere postico lineis radiantibus crebris ; dorso lineis concentricis crebris regu- 

 laribus. 



Shell suborbicular, equilateral, ventricose ; umbones, mesial and contiguous, margins of 

 the valves regularly rounded ; surface ornamented with concentric regular small ridges, 

 posterior portion with radiating closely arranged lines. 



This small species is very abundant in the shelly beds of the Great Oolite, the con- 

 centric lines are most elevated and conspicuous in the smallest specimens, in those of 

 the largest size which have a diameter of 1 lines, the lines are nearly or quite obsolete. 



Height and lateral diameter equal, diameter through both the valves one third less. 



Localities. Every Great Oolite quarry in the Minchinhampton district. 



CARDIUM BUCKMANI. Tab. VII, fig. 2. 



CABDIUM L^EVIGATUM, Lycett. Annals Nat. Hist., p. 422, 1850. 



Testa subltevi ovato-suborbiculari convexd, umbonibus medianis prominulis incurvis, latere 

 antico rotunda, postico obliquo, sed rotundo, basi arcuatd ; striis concentricis tenuissimis 

 irregularibus. 



Shell smooth, ovately orbicular, convex, umbones mesial, prominent, and incurved, 

 anterior side rounded, posterior side oblique and rounded, base curved symmetrically ; 

 dorsal surface, with a few very fine and irregular concentric striae. 



The substance of the test is very thin, and its bad state of preservation together with the 

 variety of the species render it difficult to exemplify it from any one specimen ; much 

 finer and more perfect specimens have been procured in the shelly freestone of Leckhampton 

 hill, by the Rev. P. B. Brodie. 



Height 22 lines ; lateral diameter 24 lines ; diameter through both the valves 1 5 lines. 

 It has occurred in more than one of the shelly beds. 

 Locality. Minchinhampton Common. 



CARDIUM SUBTRIGONUM. Tab. VII, fig. 3. 



Testa subtrigond, convexd, umbonibus acuminatis contiguis anticis, latere postico 

 elongato oblique declivi, lineis radiantibus undulatis ; dorso striis tenuissimis concentricis 

 irregularibus. 



Shell subtrigonal, convex; umbones pointed, prominent, contiguous and anterior; 

 posterior side elongated, sloping obliquely with radiating and waved lines ; dorsal surface 

 with very fine, concentric, irregular striaa. An ill-defined obtuse angle passes obliquely 



