508 T. H. Withers — New Species of Cirripedes. 



and convex at the sides than in B. (?) tithonicus, and this considerably 

 alters the shape of the basal margin. 



B. (?) FiMBKiATiTs and B. (?) TITHONICUS, Compared with other 

 Jurassic species. 



Archceolepas royeri,^ P. de Loriol (Portlandian = Tithonian), and 

 A. reienhacheri^ A. Oppel (Kimmeridgian), have quite small and 

 thin-walled carinte, and are readily distinguished from the above two 

 species by their triangular shape and the absence of transverse ridges. 



Pollicipes suprajurensis^^ P. de Loriol (Portlandian = Tithonian), 

 differs in the more rapidly widening carina, in the smaller transverse 

 convexity, and in the pronounced convexity of its basal margin. 



Scalpellum reticulahim,^ J. F. Blake (? = Pollicipes), a Kimmeridgian 

 species, differs in the more rapidly widening carina, in the smaller 

 transverse convexity, and in the strong convexity of the growth- 

 lines ; the basal portion of the valve is broken. 



Pollicipes quenstedti,^ von Ammon (referred to Archceolepas by 

 Zittel), of Kimmeridgian age, although ridged transversely, has not 

 the prominent equally-spaced transverse ridges, and has a somewhat 

 less acute apical portion. 



Pollicipes ooliticus,^ J. Buckman (Bathonian), differs in having 

 a proportionately much wider base, and in the absence of prominent 

 equally spaced transverse ridges. 



P. (?) lotharingicus,'' A. Mechin (Pliensbachian = Charmouthian), 

 differs much in shape, being considerably narrower and more attenuated 

 in the upper half of the carina. It differs further in the absence of 

 prominent, regularly-spaced, transverse ridges, and particularly from 

 Brachylepas {^) Jtmbriatus in the absence of longitudinal ridges. 



EXPLANATION OF PLATE XXIII. 



Fig. Irt. Brachylepas (?) fimbriatus. Withers, sp. nov. External view of 

 carina. x 3 diam. Tithonian, Eed Limestone : Stramberg, 

 Moravia. 

 ,, 16. Side view of same. 

 ,, 2a. B, (?) tithonicus. Withers, sp. nov. External view of carina. 



X 3 diam. Tithonian, White Limestone : Stramberg, Moravia. 

 ,, 2b. Side view of same. 



The figures in this Plate have, by kind permission of the Keeper, been copied 

 from photographs in the Geological Dej)artment of the British Museum, taken 

 by Miss M. B. Chapman. 



^ P. de Loriol, Mem. Soc. Linn. Normandie, vol. xvi, p. 20, pi. iii, fig. 1, 

 1872. 



- A. Oppel, Palaeont. Mittheil. Mus. d. k. Bayer-Staates, Stuttgart, 1862, 

 Bd. i, p. 116, pi. xxxviii, fig. 6. 



* P. de Loriol, Mem. Soc. Phys. d'Hist. Nat. Geneve, vol. xxiii, p. 261, 

 pi. i, fig. 1, 1873-4. 



■* J. F. Blake, Quart. Journ. Geol. Soc. London, vol. xxxi, p. 232, pi. xii, 

 fig. 1, 1875. 



^ Max Schlosser, Palaontographica, Bd. xxviii, p. 60, pi. viii, fig. 11, 1881. 



" C. E. Darwin, Pal. Soc. Mon. Foss. Lepadidse, 1851, p. 50, pi. iii, fig. 2. 



"^ A. Mechin, Bull. Soc. Sci. Nancy, ser. Ill, vol. ii, fasc. i, p. 16, with 

 plate, 1901. 



