224. CRETACEOUS LAMELLIBRANCHIA. 
ADDITIONS AND CORRECTIONS. 
Page 51. Placunopsis undulata (Miller). Two specimens closely resembling 
this species have been obtained by Mr. R. M. Brydone from the Trimingham Chalk. 
Figures are given by Holzapfel (1889) and Ravn (1902). 
Page 35. Barbatia aptiensis (Pict. and Camp.). This species has been found 
by the Rev. W. R. Andrews at the base of the Gault at Dinton, in the Vale of 
Wardour, and recorded as Arca Raulini by Mr. Jukes-Browne. 
Page 41. Barbatia Galliennei (A Orb.). A specimen has been obtained from 
the Chloritic Marl of Maiden Bradley. 
Page 70. Add Pecruncutus VauGHanl, sp. nov. Plate XLII, fig. 11. 
Description.—Shell stout, convex, nearly equilateral, but shehtly longer 
anteriorly than posteriorly, with a rounded subquadrate outline; length a little 
greater than height. Umbones small. Hinge-area very small. Ornamentation 
consists of numerous flattened radial ribs, separated by linear grooves; the ribs 
are more numerous on the left valve than on the right, and more numerous on 
the anterior than on the middle parts of the valves. A few faintly marked growth- 
lines are seen at intervals. Interior of valves not seen. 
Measurements : 
Length : : : 5 . 315 mm. 
Height : ‘ , : 5 OHO) ap 
Affinities. —This form presents some resemblance to I. subconcentricus, Lamarck,' 
but is more nearly equilateral, has a much smaller hinge-area, and the concentric 
ridges are absent. 
Remarks.—I have seen only one specimen of this species. The two valves are 
united, and consequently the interior cannot be seen. The specimen was collected 
by Mr. Arthur Vaughan, B.A., B.Sc., and presented by him to the Woodwardian 
Musewn. 
Distribution.—Greensand of Blackdown. 
Page 71, line 20 from the top. For “ Bed ii” read “ Bed 11.” 
‘ ] 
Page 80. Trigonia spectabilis. Reference to Lycett—for pl. xxxvi read pl. xx. 
1 D'Orbigny, ‘ Pal. Frane. Terr. Crét.,’ vol. iii (1844), p. 189, pl. ecevi, figs. 12—19. 
