Dr. R. Woodward — Cirripedes from Trimmingham Chalk. 351 



My father, in bis "MS. Illustrations" (tab. xi, figs. 5a, 6), 

 prepared to accompany a publisbed " Synoptical Table of British 

 Organic Eemains," by Samuel Woodward (4to and 8vo, 1830, p. 9 ; 

 London, Longmans & Co.), gives drawings of the tergum and 

 carina of this species (under the genus Pollicipes) from the Norwich 

 Chalk. 



I have received from Dr. Eowe a very well preserved carina 

 (although wanting a portion of its base) obtained by him from 

 Edward's Chalk Pit, Mousehold, Norwich, measuring in its present 

 state 30 mm. in length by 7 mm, in breadth at its widest part, its 

 •profile being 4 mm. deep. It has numerous ^-shaped lines of 

 growth passing over the keel, the point directed downwards, ten of 

 which are more prominent than the rest. There are also several 

 longitudinal strise extending from the apex to the base (Figs, 33a, 336). 

 Two longitudinal folds mark the narrow lateral portions of the 

 carina, which is sharply recurved at its apex. 



Dr. A. Kowe has also kindly sent me a carinal latus of Scalpellum 

 maximum, which agrees with the figure of that valve given by 

 Darwin (op. cit., tab. ii, figs. 4a-c). It is from Attoe's Pit, 

 New Catton, Norwich {B. mucronatus zone). Darwin states that 

 his figure was taken from a specimen from Kopinge in Scania. 

 Dr. Th. Marsson (in his " Cirripedien d. Riigensohen Kreide," taf. i, 

 fig. 2) figures and describes a precisely similar valve, which he says 

 is a carinal latus of Sc. maximum. Another small specimen is 

 recorded by Darwin from Charing in Kent (op. cit., p. 32). "Valve 

 thin, of an irregular shape (Fig. 35), sub-triangular, flat, except at 

 the umbo, which projects outwards, owing to a ledge formed beneath 

 and round it; carinal margin very slightly convex, with a linear 

 furrow parallel to it, between which and the edge the lines of growth 

 are abruptly upturned ; lower margin considerably convex, upper 

 margin slightly concave, with a slight depression parallel to it, 

 between which and the edge the lines of growth are rectangularly 

 ■reflected towards the umbo." Height of valve 12 mm., greatest 

 breadth 12 mm. 



Mr. Brydone considers it very doubtful as to whether this form 

 occurs in the Trimmingham Chalk, but in looking over some 

 fragments of valves in Mr. Brydone's Trimmingham collection, 

 associated with terga of P. Angelini and a scutum and tergum of 

 P. striatus, var. paucistria, I found a broken scutum of Scalpellum 

 maximum. It was a very large and very thick valve, and displays 

 on its inner surface the depression for the adductor muscle. The 

 outer surface has the usual lines of growth and fine longitudinal 

 strife seen in the other valves belonging to this species. Length of 

 fragment 18 mm., greatest breadth 10 mm. From the proportionate 

 size and thickness of this fragment I am led to conclude that it 

 must have really belonged to S. maximum. 



Tergum (Fig. 34). — This is only a fragment (from Dr. A. Eowe's 

 collection), but from its form and lines of growth I have no difficulty 

 in recognising it as the apex of a tergum of S. maximum. Cf. Darwin's 

 figures of this valve (tab. ii, figs. 7a, b). It is a narrow crescent- 



