277 
This shell may be readily distinguished from contempo- 
_ raneous species by its general aspect. The cost are fine lines, 
five on the penultimate volution; the height of each yolution 
_ is rather less than the diameter. In the only example discovered 
the upper part of the spire is broken off, its hei ght cannot 
_ therefore be determined, but it is probably about nine lines. 
Locality.—Bussage, in the Great Oolite. 
TRIGONIA UNDULATA, FROM. var. PLayNet, Witc. PI. V., fig. 6. 
_ Shell sub-ovate, erect, convex, umbones curved and bent 
_ forward, area convex, crossed by transverse plications, marginal 
_ carina nearly obsolete; median furrow without carina; rows of 
cost numerous, moderate in size, tuberculated, tubercles dis- 
_ tinct on the upper rows of coste, more obsolete on those below ; 
_ costze irregular over the lower half of the shell. Compared with 
_ the examples of this species figured by Lycerr (Brit. Foss., 
_ Trigome, Pl, XVI, figs. 9, 10, 11, and Pl. XVII, figs. 5, 6,) this 
shell is more erect, larger and more convex; the umbones are 
much more curved. Its length in proportion to its diameter is 
as four to three, whereas Lycerrr’s figures are nearly as wide 
aslong. These differences are considered sufficient to consti- 
tute this shell-a variety of T. undulata. 
_  Locality,—Calcot, near Kingscote, from the lower beds of 
the Forest Marble (abundant.) 
_ have named this shell after my late esteemed friend and 
colleague G. F. Puayne, deceased, who was an indefatigable 
member of the Cotteswold Club, and the author of several 
va uable papers which appear in the Transactions. 
Lima CorrEeswoLDIEnsis, n. sp. Pl. V., fig. 4, 4a, 4b. 
_ Shell tumid, nearly upright, umbones sub-mesial, ribs (52 to 
54) regular, rounded, moderately elevated, but nearly obsolete 
in amity to the umbones, the diameter equal to the inter- 
titial spaces, which are striated, strize rather closely arranged, 
