22 FOSSIL CIRRIPEDIA. 
[B] Valve duodecem: Carine umbone ad apicem posito. 
2. ScALPELLUM quapRATUM. ‘Tab. I, fig. 3. 
XIPHIDIUM QUADRATUM. Dixon, in Sowerby’s Mineral. Conch., Tab. 648 ; Geology of 
Suffolk, Tab. xiv, figs. 3 and 4. 
POLLICIPES — 2? J. Sowerby. Geolog. Trans., 2d series, vol. v, pl. 8, fig. 5. 
S. tecto parietibusque carine planis, levibus, simplicibus, margine basali feré rotun- 
dato; Lateribus superioribus quinque-lateralibus, levibus. 
Carina, with its tectum and parietes flat, smooth, and simple; basal margin almost 
rounded. Upper latera five-sided, smooth. 
Eocene Tertiary. Bognor; Hampstead. Mus. 8. Wood, F. Edwards, N. Wetherell. 
My materials consist of a slab of rock, belonging to Mr. S. Wood, almost made up of 
the valves of this species, of two beautiful specimens in Mr. F. Edwards’s collection, and of 
some excellent drawings from Mr. Dixon’s specimens by Mr. James de C. Sowerby, in the 
Mineral Conchology.’ The valves in several of these specimens are nearly in their proper 
positions, though there is not one in which they have not slipped a little. Their relative 
positions are given, I believe nearly correctly, in Pl. I, fig. 3@. Their number I have 
little doubt was twelve. This, however, includes a rostrum, probably almost rudimentary, 
the existence of which I infer only from the analogy of all recent species. Mr. J. Sowerby 
supposed that there were, asin S. vulgare, four pair of latera (and therefore fourteen valves 
in all), but I conclude, without hesitation, that there were only three pair, as in the recent 
S. rutilum (nov. spec.), to which the S&. quadratum is much more nearly allied than to 
S. vulgare. 
Capitulum: elongated, probably composed of twelve valves. Carina (fig. 3, d, 7, 4), 
rather narrow, slightly and regularly bowed and widening from the apex to the basal 
margin, which latter is bluntly pointed, or almost rounded; internally deeply concave ; 
externally with the tectum and parietes flat, and at right angles to each other ;—hence the 
carina is square-edged, and its specific name has been given to it. Scuta (fig. 3, 4, h) 
oblong, occludent margin slightly arched, forming with the basal rather less than a right 
angle; tergal margin separated by a just perceptibly projecting pomt from the lateral 
margin, which latter is very slightly hollowed out ; whole valve slightly convex, with a trace 
. of a ridge running from the apex to the baso-lateral angle. Internally (4), there is a large 
pit for the adductor scutorum, above which there is a slight depression or fold marked 
with curved lines of growth, and in this depression on each side complemental males 
1 Some small fragments were found by Mr. Wetherell, and are noticed in his Paper in the fifth volume of 
the ‘Geolog. Transactions,’ entitled ‘Observations on a Well dug on the south side of Hampstead Heath.” © 

