194 CRETACEOUS LAMEIJ/rBRANCHTA. 



Venus planus, Sowerby, by several authors; l and so far as I can judge from the 

 few figures which have been published, they seem to differ but little from 

 Sowerby' s species. The example from Aachen figured by Goldfuss agrees closely 

 with specimens from Blackdown except that the lunule projects more at the 

 margin. Holzapfel has compared Aachen with Blackdown specimens, and 

 confirms Goldfuss's identification. The example figured by d'Orbigny 3 differs 

 in having a large and deep escutcheon. 



Specimens from the Trichinopoli Group (near the base of the Ariyalur Group) 

 were identified by Stoliczka 3 with Venus planus. 



The absence of a channel under the anterior right cardinal, and the occurrence 

 of fine radial ornamentation connect this species with Gallista. The pallia! sinus, 

 however, resembles that of V 'ii 'aria. The anterior lateral tooth in the left valve is 

 much less prominent, and the corresponding pit in the right valve much smaller 

 and shallower than in either Gallista or Pitaria. This species is the type of the 

 section or sub-genus Gallistina, Jokes-Browne. 4, 



Remarks. — This is a common fossil at Blackdown. The variations seen 

 consist in the proportion of height to length, the more or less triangular or oval 

 outline, and the more or less produced anterior part of the shell. 



Type. — From Blackdown ; in the British Museum. 



Distribution. — Upper Greensand (zone of Schloenbachia rostra fa) of Blackdown 

 and Haldon. Recorded by Jukes-Browne from the Upper Greensand of Devizes, 

 the Isle of Wight, etc. 



Ft i mily— C ARDIID^ , Lamarck. 

 < !<>ii us — Protocardia, E. Beyrich, 1845. 



(' Menke's Zeitschr. f. Malakozool.,' p. 17.) 



Pkotocaedia angtjoa, sp. nov. Plate XXX, figs. 7 a,h; Plate XXXI, fig. 1. 



Description. — Shell large, convex, with flattened sides, subquadrate, moderately 



1 Goldfuss, ' Petref. Germ.,' vol. ii (1840), p. 238, pi. cxlviii, fig. 4 ; Miiller, ' Petref. der Aachen. 

 Kreidef.,' (1847), pt. 1, p. 25; Drescher, 'Zeitschr. d. deutsch. geol. Gesellsch.,' vol. xv (1863), p. 

 344; Brauns, 'Zeitschr. f. d. gesammt. Naturwiss.,' vol. xlvi (1876), p. 368; H. Schroder, 'Zeitschr. 

 d. deutsch. geol. Gesellsch.,' vol. xxiv (1882), p. 275; Holzapfel, 'Die Mollusk. Aachen. Kreide' 

 (' Palaeontogi-apliica,' vol. xxxv, 1889), p. 171, pi. xiii, figs. 16 — 18; Vogel, ' Hollandisch. Kreide' 

 (1895), p. 42. 



2 D'Orbigny subsequently separated the Senoniau form under the name Venus subplana, ' Prodr. 

 <le Pal.,' vol. ii (1850), p. 237. See also V. Benausdana, d'Orbigny, ibid., p. 194. 



3 Stoliczka, ' Palseont. Indica, Cret. Fauna S. India,' vol. iii (1870), ]>p. 151,160,169, pi. vii, figs. 

 1—4. 



* Proc. Malacol. Soc, vol. viii (1908), p. 156. 



