496 T. H. Withers — A netv Cirrijyede froon Chalk Marl. 



in Mr. Harris's collection of organic remains from the chalk detritus, 

 at Charing, in Kent, I have found the upper part of a carina of 

 a very young and minute Scalpelliim, which cannot be distinguished 

 from this species [*S. magnum] ; but considering the state of the 

 specimen, it would be extremely rash to believe in their identity. 

 All the known cretaceous species have the umbo at the apex, so 

 that the Charing specimen differs remarkably from its cretaceous 

 congeners." Although search has been made among the Cirripede 

 remains of the Harris Collection from the Charing detritus, now in 

 the Geological Department of the British Museum, the specimen 

 recorded by Darwin cannot be found. It is extremely likely, 

 however, that it belonged to the species here described, since I am 

 of the opinion that the Cirripede material seen by me from the Chalk 

 detritus of Charing is of Cenomanian age. 



SCALPELLUM PAKVULUM, Sp. nOV. 



Diagnosis. — Carina with the umbo situated from Just below to 

 about one-third the extent of the valve from the apex, outer surface 

 smooth ; apical portion acute and widening gradually downwards to 

 near the basal margin, where the valve is somewhat expanded ; 

 tectum and parietes not separated by a ridge ; inner margin of intra- 

 parietes straight. 



Material. — Four minute carinse, of which the longest measures 

 2'1 mm., and thirteen scuta, the largest of which has a length of 

 5 '2 mm. and a breadth of 2'4 mm. 



Holotype. — The carina (Text-figs. \a, b). 



Morizon and Locality. — Cenomanian, Chalk Marl : near Cambridge, 

 and Burham, Kent. Cambridge Greensand : near Cambi'idge. 



Description of Valves. — Carina angularly bent, with the umbo 

 varying in position from just below to about one-third the extent of 

 the valve from the apex ; the valve is acute at the apex, and widens 

 gradually downwards until near the basal margin, where the valve is 

 rather abruptlj^ expanded ; tectum smooth, transversely rounded, not 

 distinctly separated from the parietes ; intraparietes wider than half 

 the width of the basal portion of the valve, separated from the 

 parietes by a distinct ridge, and by their upward growth form that 

 part of the valve above the umbo ; inner margin of intraparietes 

 straight. Outer surface smooth ; inner surface deeply concave, not 

 narrowed under the umbo. 



Scutum sub-triangular, outer surface smooth, with an extremely 

 narrow raised rim extending along the occludent margin, and without 

 the slightest trace of an apico-basal ridge ; moderatelj'' convex 

 transversely, apical portion acute and slightly curved towards the 

 terga. Occludent margin slightly convex ; basal margin, in some 

 specimens making almost a right angle with the occludent margin, 

 and in others is sharply upturned and blends into the lower part of 

 the tergo-lateral margin ; upper part of tergo-latei'al margin slightly 

 concave, and the tergo-lateral angle rounded. On the inner surface the 

 occludent edge is flat and slightly overhangs the rather shallow pit 

 for the adductor muscle ; from the tergo-lateral margin, opposite the 



