348 Dr. H. Woodward — Cirripedesfrom Trimmingham Chalk. 



5. (?) PoLLiciPEs CONCINNA, H. Woodward, sp. nov. 



(Figs. 29, 30.) 



There are two valves from the Trimmingham Chalk in 



Mr. Brydone's collection which I have been unable to collate 



satisfactorily with any of the species already described from the 



Chalk. 



(a) In outline the smaller one (Fig. 29) agrees with the lower 

 latus of P. unguis of Darwin, from the Gault, but its ornamentation 

 is not based so much on the lines of growth as upon delicate, fine, 

 radiating costas diverging from its apex. The valve has two areas, 

 separated by a well-defined ridge ; the larger is 7 mm. broad at its 

 base, the smaller, which forms with it an obtuse angle, being only 

 31mm. broad; the height of the valve is 8mm.; five well-marked 

 zones of growth cross the rib-like ornamentation at irregular 

 intervals. This is a lower latus (or a carinal latus), ^ and in 

 default of a species to which it can be referred it may be known as 

 (?) PolUcipes conctnna. 



(b) This (Fig. 30) is a larger valve than (a) noticed above, and 

 possibly may belong to a distinct species. At first sight its outline 

 seems to be not unlike a scutum, but in relative proportion it has 

 a broader base and is shorter in height than this valve usually 

 attains. It probably is, like (a), one of the lower latera, but being 

 imperfect upon its broader facet is not so easily determined. The 

 ornamentation is composed of radiant lines, but they are fewer in 

 number and coarser than in the above-described form (a). Height, 

 8 mm. ; width of smaller perfect side at base, 5 mm. ; broader facet 

 at base (estimated to be 6 to 7 mm.?) ; margin broken. The angle of 

 this valve (b) is more curved than is that of (a) ; longitudinal striee, 

 on narrow face, about six in number, thicker at the basal margin, on 

 broader face at least ten in number. This may have belonged to 

 a form similar to (a), but its coarser striation would suggest its 

 being possibly referred to some other species. In the absence of 

 further information I must, however, leave it here until better 

 material turns up. 



6. (?) PoLLiciPES STRiATUs, Darwin, 1851, var. paucistriatus, H. W. 



(Figs. 31, 32.) 



PolUcipes sMatiis, Darwin, Mon. Foss. Lepadidae : Pal. Soc, vol. v (1851), p. 70, 

 tab. iv, fig. 6. 



This form, of which a well-preserved scutum and tergum have 

 been obtained by Mr. Brydone from Trimmingham (Figs. 31 and 

 32), was previously known from the Upper Chalk of Norwich 

 (Museum Fitch), and figured by Darwin (op. cit., pp. 70-72, tab. iv, 

 fig. 5). 



I should state that these Trimmingham specimens were sent 

 some time ago by Mr. Brydone to Professor Deecke, of Greifswald 

 University, Prussia, who marked them as " Scalpellum fossula, 



' It compares very well with the carinal latus in the living Scalpellum striolatum 

 of Sars taken between Norway and Faeroe Island (see A. Gruvel, Mon. Cirripedes, 

 1905, p. 64, fig. 7). 



