FOSSIL CIRRIPEDKS. 943 



of the space between the scuta and carina ; lower whorl com- 

 prising three pairs of latera, a rostrum, and a subcarina. Umbo 

 of all valves apical. 



The Oriental group, called by Pilsbry (1908) Calantica s. str., 

 has the valves of the lower whorl low and wide, small, not 

 concealing the bases of the valves of the upper whorl. 



TiTANOLEPAS *, subgen. nov. 



Valves of lower whorl large, high, but not incurved, and over- 

 lapping the bases of the valves of the upper whorl, Umbo of 

 scutum subcentral and of the remaining valves apical. 



Genotype. — Titanolepas tnherculaia. 



Calantica (Titanolepas) tuberculata Darwin sp. (PI. XC Y. 

 figs. 1-10.) 



1851. Scalpellum tuherculatum 0. R. Darwin, Pal. Soc. Monogr. 



Foss. Lepadidse, p. 43, pi. i. fig. 10. 

 1854. Scalpellum tuherculatimi C. R. Darwin, Ray Soc. Monogr. 



Sub-class Cirripedia, Balanidae, Synopsis et Index Syste- 



maticus, p. 634. 

 1854. Scalpellum tuberculatum C. R. Darwin : J. Morris, Cat. 



Brit. Foss. 2nd ed. p. 97. 

 1865. Scalpellum tuberculatum 0. R, Darwin : J, W. Salter & 



H. Woodward, Cat. & Chart Fo,ss. Crustacea, p. 27, pi. i. 



fig. 17. 

 1877. Scalpellum tuberculatiim, C. R, Darwin: H. Woodward, 



Brit. Mus. Cat. Brit. Foss, Crustacea, p. 143. 



1886. Scalpellum tuberculatum C, R. Darwin : J. Kafka, Sitz.- 



Ber. k. bohm. Gesell. Wiss. Prag (1885), p. 565, pi, i, 

 fig. 7. 



1887. Scalpelhon tuberculatum C, R. Darwin : A, J. Fi-itsch & 



J. Kafka, Crust. Bohmischen Kreidef. p, 6, fig. 9. 



1888. Scalpellum tuberculatum C. R, Darwin: A. Peron, Bull, 



Soc. Sci. Yonne, vol. xli. (1887) p. 269. 



Diagnosis. — Yalves with fine ribs radiating from their apices 

 and standing out as blunt spines at each zone of growth, Carina 

 strongly convex transversely, with the parietes narrow and 

 striated. Scutum with the umbo situated about one-third the 

 extent of the valve from the apex, and with two ridges extending 

 from the umbo, one to the basi-lateral angle, and the other to near 

 the rosti'al angle, Tergum elongately diamond-shape, with a very 

 acute basal angle. Valves of lower whorl with the inner apical 

 half flat and strongly marked with growth-lines. 



Remarking on this species, Darwin said (1851, p. 43) : "Through 

 the kindness of Mr. Harris, I have examined several valves, which 

 I believe to belong to the same species : the specimens were found 

 in the chalk detritus [of Charing, Kent], and^ therefore, may have 

 come from the Upper or Lower Chalk or Chalk-marl ; but more 

 probably from the Upper Chalk," 



* Tirai'os = White eartli, Chalk, 



63* 



