22 FOSSIL CIRRIPEDIA. 



[B] ValvcB duodecem : Carina nmbone ad ajncem posito. 



2. SCALPELLUM QUADRATUM. Tab. I, fig, 3. 



XiPHiDiUM auADRATUM. Dixon, in Sowerby's Mineral. Conch., Tab. G48 ; Geology of 



Suffolk, Tab. xiv, figs. 3 and 4. 

 PoLLiciPES — 1 J. Sowerby. Geolog. Trans., 2d series, vol. v, pi. 8, fig. 5. 



S. tecto parietibusque carina planis, lavibus, simplicibuSy margine basali fere rotun- 

 dato ; Lateribus superioribus quinque-lateralibus, lavibus. 



Carina, with its tectum and parietes flat, smooth, and simple ; basal margin almost 

 rounded. Upper latera five-sided, smooth. 



Eocene Tertiary. Bognor ; Hampstead. Mus. S. 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 PI. I, fig. 3 a. 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 tbat there were, as in S. vulgare, foiu* pair of latera (and therefore fourteen valves 

 in all), but I conclude, without hesitation, that there were only tlu-ee pair, as in the recent 

 8. rutilwn (nov. spec), to which the S. quadratum is much more nearly allied than to 

 JS. vulgare. 



Cupitulwn : elongated, probably composed of twelve valves. Carina (fig. 3, d, i, k), 

 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 wdth 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, b, h) 

 oblong, occludent margin slightly arched, forming with the basal rather less than a right 

 angle ; tergal margin separated by a just perceptibly projecting point 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 {h), 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 compleraental males 



^ 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." 



