T. H. Withers—New Chalk Cirripedes. 155 
oval, and the raised longitudinal ridges which occur nearly regularly 
over the entire valve give it a far different appearance. 
3. ScaLPELLUM cyPHUM, sp. nov. Figs. 6-9. 
Diagnosis.—Carina narrow, moderately bowed inwards, with inner 
margin slightly curved, widening gradually from the apex, which is 
sharply pointed, divided into parietes and intraparietes; basal margin 
angular (about 75°). Tectum strongly arched transversely. Parietes 
narrow, steeply inclined from the tectum, slightly concave, about half the 
width of the tectum, widening gradually to the basal margin. Tectum 
and parietes ornamented with a number of coarse, rounded, longi- 
tudinal ridges, readily seen with the naked eye. One stronger ridge 
runs down the middle of the tectum, and one on each side divides the 
tectum from the parietes. The interspaces between the ridges are 
about three times the width of the ridges. Intraparietes separated 
from the parietes by a strong rounded ridge, measuring in their 
widest part slightly more than the rest of the valve at that part, 
widening rapidly from the apex and then narrowing rapidly until 
a little more than half-way down the valve, when they merge. into 
the sides of the parietes, at a short distance from their basal margins. 
Surface of tectum and parietes covered with well-marked V-shaped 
growth-lines. 
Fic. 6. Scalpellum cyphum, T. H. Withers, sp. nov. External view of carina, 
x 2 nat. size. Cenomanian, Grey Chalk: near Dover, Kent. (B.M., 
I. 13,405.) 
7. Id. Side view, x 2 nat. size. 
», 8. Id. Transverse section at one-third from apex, x 2 nat. size. 
,, 9. Id. ‘Transverse section at one-third from base, x 2 nat. size. 
Holotype.—A carina (B.M., I. 18,405), J. Starkie Gardner Collection. 
Extreme length about 22mm., greatest breadth 5mm. The basal 
angle of the specimen is broken, but judging from one side of the 
margin it was probably angular. 
Horizon and Locality.—Cenomanian, Grey Chalk: near Dover. 
There is in the British Museum (Natural History), (B.M., I. 13,406), 
from the same horizon, locality, and collection, a smaller carina, which 
probably belongs to this species. It agrees in most of its characters 
with the preceding description, but the central longitudinal ridge is 
