78 SUPPLEMENT TO GREAT OOLITE MOLLUSCA. 
Asrarre Hitperrensis, Lye. ‘Tab. XXXVI, fig. 10. 
Testa crassa, convexa, ovato-trigonata, umbonibus subanticis prominentibus, lunula ovata 
profunda, margine cardinali curvato, elongato, oblique declivi, marginibus anterioribus, pos- 
terioribus et inferioribus ellipticis curvatis ; superficie plicis incrementi crebris tenuibus. 
Shell thick, convex, ovately trigonal; umbones antero-mesial, elevated, and curved 
forwards; lunule smooth, ovate, deep; hinge-margin lengthened, cnrved, sloping obliquely 
downwards ; the anterior, posterior, and lower borders curved elliptically ; the surface with 
delicate, numerous plications of growth. 
A large, thick species, somewhat allied to 4. svbtrigona, Munst., but more convex, less 
angulated, and with a larger lunule. 
Geological Position and Locality. The Cornbrash of Hilperton, Wilts, in the collection 
of W. Walton, Esq. 
Astarte Aytonensis, Bean MSS. ‘Tab. XU, fig. 13. 
Testa ovato-oblonga, valde elongata, compressa, umbonibus depressis antemedianis, 
lunula concava, margine cardinali subhorizontali elongata, margine inferiore parallelo ; late- 
ribus rugis ellipticis, crebris, depressis subregularibus instructis. 
Shell ovately oblong, much elongated, compressed ; umbones anterior to the middle of 
the valves flattened ; lunule concave; the hinge-margin lengthened and nearly horizontal ; 
lower border conformable; the two extremities elliptically rounded ; the surface with closely 
arranged, depressed, rounded, elliptical, partially irregular rugze. 
The general aspect has some resemblance to the shell figured in Part II, Pl. IX, figs. 
1S, 19, as a variety of Astarfe excavata, but still more flattened and more elongated, with 
more conspicuous, regular, elliptical rugae. | Additional experience now leads me to rank 4. 
eacavata, var. compressiuscula, as a distinct species, and not as a dwarfed variety of the large 
Inferior Oolite shell ; the present form is even more thin and flattened than compressiuscula, 
so much so as scarcely to allow any space for the animal. 
Length nearly twice the height; the diameter through the united valves is little more 
than equivalent to their apparent thickness. 
Geological Positions and Localities. The Great Oolite of Hampton Cliffs and of 
Comb Down, near Bath; collected by W. Walton, Esq. It occurs also in the Calcareous 
Grit of Ayton, near Scarborough, quite unaltered in any particular ; the name from the 
locality having been adopted by Mr. Bean many years since, and sent to public collections, 
has therefore been retained. 
