24 FOSSIL CIRRIPEDIA. 
3. ScaALPELLUM FossuLA. Tab. I, fig. 4. 
PoLLIcIPes MAxtMus. J. Sowerby. Min. Conch. Tab. 606 (a tergum), fig. 3. 
S. carinaé intra-parietibus instructa ; tecto utrinque costis magnis, tumidis, superne 
planatis, marginato; margine basali obtuse acuminato. Lateribus superioribus quinque- 
lateralibus; costis duabus modicis ab apice ad marginem basalem continuatis. : 
Carina, having intra-parietes, with the tectum bordered on each side by large, pro- 
tuberant, flat-topped ridges; basal margin bluntly pointed ; upper latera five sided, with 
two slight ridges extending from the apex to the basal margin. 
Upper Chalk. Norwich; Northfleet, Kent. Mus. Fitch, J. de C. Sowerby, Wetherell. 
General Remarks. My materials consist of two specimens, belonging to Mr. Fitch, 
most kindly lent me for examination; in which, taken together, the scuta, terga, carina, 
upper and carinal latera, are seen almost in their proper places. In Mr. J. Sowerby’s 
collection there is a single scutum, also, from Norwich. From analogy with the eocene 
S. quadratum and the recent S. rutilum, I have little doubt that there were only three pair 
of latera; and that, probably, there was a rostrum. With respect to the exact position of 
the carinal latera, there is, as also in the case of the 8. guadratum, some little doubt. 
Capitulum narrow, elongated, probably composed of 12 valves, which are moderately 
strong, and apparently closely locked together. The length of the capitulum in the largest 
specimen was 1-1 of an inch. 
Carina (fig. 4, c, g, h) strong, moderately bowed, extending far up between the terga, 
almost to their upper ends; rather narrow throughout, gradually widening from the apex 
to the base; limes of growth plain; no portion projects freely. The tectum or central 
portion is slightly arched, subcarimated, and bounded on each side by flat-topped, pro- 
tuberant ridges: the tectum terminates downwards in a blunt point (the two margins 
forming an angle of rather above 90°), which projects beyond the bounding ridges; the 
tectum and the two bounding ridges all widen gradually from the apex towards the 
base. The parietes are channelled or concave; they do not extend so far down as 
the ridges bounding the tectum. In the upper half of the carina, we here first see 
the additional parietes, or intra-parietes, which appear as if formed subsequently to 
the other parts, and let in between the ordinary parietes of the carima, and the terga. 
It has been already shown, under S. magnum, that it is the intra-parietes produced 
upwards, which causes in that and some other species the umbo of the valve to be sub- 
central. | 
Scuta (fig. 4, a,f) oblong, the basal margin only slightly exceeding half the entire length 
of the valve; valve strong, rather plainly marked with les of growth; basal margin at 
nearly right angles to the occludent margin; tergal margin separated by a slightly-projecting 

