192 Mr. T. H. Withers on some 



paired scuta, and paired terga. The subsequent discovery, 

 therefore, of the upper latera in the species P. fallax, P. 

 eleaans, P. rigidus, as well as a large rostrum in those species 

 and in P. pm-onai, shows quite coi'clusively that they cannot 

 be referred to Scilhelepas. These species, for reasons pre- 

 viously given, are now referred to the new genus Pycaolepas. 

 Poliicipes dorsatus, which was tentatively referred to Scillte- 

 hjias by Seguenza, is now definitely proved to belong to it 

 (see p. 198), and since P.validus is evidently an allied form, 

 there now seems to be more justification for its reference 

 to SciUcelepas. P. gracilis is regarded as a synonym of 

 P. vulidus. 



Genus Calaxtica. 



1825. Calantka, Grav, Annals of Philosophv (n. s.), vol. x. p. 101. 



1907. Calantica, Pilsbrv, Bull. U.S. Nat. Miis. no. CO, p. 8. 



1908. Calmiiica, Pilsbry, Proc. Acad. Nat. Sci. Pliiladelphia, p. lOG. 

 1913. Calayitka, Withers, Proc. Zool. Soc. Loudon, p. 942. 



Capitulum witli two whorls of valves, the upper comprising 

 paired scuta, terga, and a carina, the terga occupying the 

 whole of the space between the scuta and carina : lower 

 whorl comprising three pairs of latera, a rostrum, and a sub- 

 carina. Umbo in all valves apical. 



The Oriental group, called by Pilsbry (1908), Caltmtica, 

 s. str., has the lower whorl low and wide, small, uot con- 

 cealing the bases of the valves of the upper whorl. 



Subgenus Sclll^lepas. 



1876. Scill(elepas, Seguenza, Atti Accad. Poutaniana, vol. x. p. 390. 



1907. ScillcBlejms, Pilsbry, Bull. U.S. Nat. Mus. no. 60, p. 9. 



1908. Scillcelepas, Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, p. 106. 



Valves of the lower wliorl large, high, and incurved, and 

 overlapping the bases of the valves of the lower whorl. 

 Umbo in all valves apical. 



Calantica (Scillcelepas) dorsata, Steeustrup, sp. 

 (Plate VIII. figs. 12-23.) 



1839. Poliicipes dorsa'us, J. Steenstrup, Kr^ver's Naturbist. Tidsskrift, 



Ed. ii. p. 411, pi. V. tig. 27. 

 1839. Poliicipes validus, J. Steenstrup, to7n. cit. p. 412, pi. v. fig. 30. 

 l&ol. Follicipes dorsatus, J. Steenstrup : C. R. Uarwin, Pal. Soc. 



Monona-. Foss. Lepadidse, p. 69, pi. iv. tigs. 4«-/. 

 1854. Follicipes dorsatus, J. Steenstrup; C. K. Darwin, Eny Soc. 



^Nlonogr. Subclass Cirripedia, Balanidse, Syuop. et Index "Syste- 



niaticus, p. 638. 



