62 FOSSIL CIRRIPEDIA. 



Scuta moderately thin, rather broad, approaching to an equilateral triangle ; basal 

 margin not quite straight ; the tergo-lateral portion, formed by the uptm'ned zones of 

 growth, where widest, half as wide as the rest of valve ; apex internally furrowed on the 

 tergal side. Carina with the basal margin bluntly pointed. Upper latera triangular, one 

 third the length of the terga. Anterior lower latera, each with a ridge running to near 

 one end of theii- basal margins. 



Lower Chalk, Stoke Ferry, Norfolk. Lower Chalk, Hanover, according to Roemer. Planer (Chalk- 

 marl), Sarstedt, near Hildesheim, Mxis. Roemer. Upper Chalk, Northfleet and Gravesend, Kent. Chalk 

 Detritus, Cliariug, Kent. Maestriclit Formation, Scania ? Mus. Flower, Wetherell, Harris, Univers. Copen- 

 hagen, Geolog. Soc, and Bowerbank. 



General remarJiS. My materials consist of several scuta, in Mr. Flower's collection from 

 Stoke Ferry, together with some carinse, and a rostrum of apparently the same species ; of 

 a single scutum from Northfleet, and of others from Charing, both in Kent ; of some scuta, 

 terga, and carinae, sent me by the great kindness of Roemer, from Sarstedt, near Hildesheim, 

 and therefore authentic specimens by him named ; and lastly, of a valuable specimen from 

 Gravesend, in Kent, in Mr. Bowerbank's collection (fig. 10, a), in which a carina, pair of 

 terga, an upper latus, and two lower latera, were embedded in nearly their proper positions, 

 together with a fragment of a scutum, which latter is sufficiently perfect to leave no doubt on 

 my mind regarding its identity with the valves from Stoke Ferry, Northfleet, and Sarstedt. 

 This appears to have been one of the commonest species of Pollicipes during the cretaceous 

 period. Though found in the upper chalk of Northfleet and Gravesend, it is singular that 

 not a single valve of this species has been collected by Mr. Fitch in the upper chalk of 

 Norwich. Amongst the Scanian fossils, collected by M. Angelin at Kopinge, from a still 

 higher stage of the chalk, and forwarded to me by Professor Steenstrup, there is an upper 

 latus and tergum most closely allied, probably even identical with the present species. 

 We have seen that it extends down even to the planer or chalk marl. 



Scuta {^g. 10, b, c, d). These valves are moderately thick and convex, so that in their 

 upper halves they are almost semi-conical ; the basal margin is not quite straight, it forms a 

 rather larger angle with the lower part of the tergo-lateral margin, than with the occludent 

 margin, both angles being less than right angles. From the apex two faint ridges run, 

 one to the baso-lateral angle, and the second to a point in the basal margin, a little nearer 

 to the rostral than to the baso-lateral angle. The valve is bent, so as to be convex, chiefly 

 along these two ridges. The tergo-lateral portion formed by the upturned lines of growth 

 is wide and protuberant. Outer surface of valve smooth, with the faintest striae radiating 

 from the apex. Viewed internally [d), a conspicuous furrow runs from the pit for the 

 adductor scutorum muscle up to the apex ; the internal occludent edge keeps the same 

 width up to the apex. The Sarstedt specimen is the largest scutum which I have seen, 

 and that is C of an inch in length. 



One out of Mr. Flower's five specimens (believed all to have come from the lower 

 chalk of Stoke Ferry) and another in JMr. Wctherell's collection from the upper chalk of 



