270 Br. F. R. G. Reed- 



Horizon. — Meadfoot Beds. 

 Locality. — Kilmorie, Meadfoot (S. 62). 



Leiopteria (Actinopteria ?) anisota (Phillips). 



The description of this shell given byj Phillips^ is assTfollows : 

 " Lower [= left] valve. — Convex, with a*prominent beak, trans- 

 versely extended to a width [= length] greater than the length 

 [= height], with very dissimilar wings ; the anterior small, round, 

 deeply separated from the body of the shell ; the posterior larger, 

 concavely arched and pointed and gradually united to the body 

 of the shell-surface radiatingly striated and concentrically marked 

 by lines of growth. The striae are conspicuous chiefly near the beak, 

 the lines of growth most promment on the posterior wing. Locality : 

 Meadfoot, in sandy ochraceous shale." 



There is a specimen (f f ) in the Jermyn Street Museum from this 

 locality which closely resembles Phillips' figure of the type, but the 

 beak is more broken and the radial striae on the surface are not 

 visible, though the concentric growth-lines are well preserved in 

 the posterior wing. It is probable that it is the original specimen. 

 We may add to the foregoing description the remarks that the body 

 is convex, rather swollen and oblique, and that the posterior ear is 

 depressed and rather concave, though not sht^rply marked off, and 

 that judging from the course of the concentric lines it was not 

 produced into an acute point, and did not project much or at all 

 behind the body. No teeth are visible. The species seems to belong 

 to the group of Avicida lamellosa Goldf. in Freeh's^ classification 

 of the Aviculidse, and this group includes members of Hall's genera 

 Actinoj)teria and Leptodesina. The species Avicida hodana A. Roemer^ 

 is apparently closely allied to our English form, and Leiopteria 

 Drevertnanni Spriesterbach * from the Siegen Graywacke (which 

 its author remarks might be placed in Hall's genus Actinoj.teria) 

 is probably a near relation. 



Horizon. — Meadfoot Beds. 



ioca%.— Meadfoot (M.P.G. ff). 



Actinodesma obsoleium (Goldfuss) var. 

 There is a good internal cast of this shell from Kilmorie in the 

 Sedgwick Museum (S. 65), consisting of a perfect left valve with the 

 greater part of the right valve attached and in position, and the 

 external impression of the umbonai region, ligamental area, hinge- 

 line and anterior margin of the latter valve. The left valve shows 

 the characters described by Goldfuss ^ and other authors, except 

 that there are 12-14 low concentric ridges on the body which is a 

 larger number than that mentioned for the species. The right valve, 



1 Phillips, Palc&oz. Fo.^s. Dev. Cornw., 1S41, p. 49, pi. sxii, fis?. S3. 



2 Fiech, Abh. qcol. spec. Kart. Preuss., Bd. i.v, Heft iii, 1891, p. 49. 



3 Frer.h, ibid., pi 54, t. iv, figs. 10-106. 



* Spriesterbach, Abh. k. preuss. geol. Landesanst., N.F., Heft Ixxx, 1915, 

 p. .33, t. ix, figs. 5, 6 (? t. X, fig. 1). 

 ^ See n. 1, p. 271. 



