224 CRETACEOUS LAMELLIBRANCHIA. 



ADDITIONS AND CORRECTIONS. 



Page 31. Placunopsis undulata (Midler). 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 G-ault at Dinton, in the Vale of 

 Wardour, and recorded as Area Baulini by Mr. Jukes-Browne. 



Page 41. Barbatia Galliennei (d'Orb.). A specimen has been obtained from 

 the Chloritic Marl of Maiden Bradley. 



Page 70. Add Pectunculus Vaugham, sp. nov. Plate XLII, fig. 11. 



Description. — Shell stout, convex, nearly equilateral, but slightly 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 . . . . .31*5 mm. 



Height ..... 30-0 „ 



Affinities. — This form presents some resemblance to P. subconcentricus, Lamarck, 1 

 but is more nearly equilateral, has a much smaller hinge-area, and the concentric 

 ridges are absent. 



Rema/rks. — 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 

 Museum. 



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 pi. xxxvi read pi. xx. 



I )< ►rbigny, ' Pal. Fran.;. Terr. Civt.,' vol. iii (1844), p. 189, pi. cccvi, figs. 12—19. 



