T. H. Withers — Neiv Species of Cirripedes. 507 



remaining portion of the valve is somewhat fractured, but the outer 

 surface is well-preserved. 



Horizon and Locality. — Tithonian, "White Limestone : Stramberg, 

 Moravia. 



BescriptionofHolotype. — Carina semi-cylindrical, widening gradually 

 from the apex to the basal margin ; slightly bowed inwards; strongly 

 convex transversely, somewhat flattened at the sides, not cai'inated, 

 basal margin slightly convex at the sides and slightly concave in the 

 middle, which is more pronounced in the earlier stages of growth. 

 Outer surface ornamented with several (twenty-four on the portion 

 preserved) prominent, sharp-edged, regularly-spaced, transverse 

 ridges, terminating each period of gi'owth, the spaces between being 

 smooth ; these transverse ridges are not undulatory, and their sharp 

 edges have a somewhat beaded ornament, which may possibly be 

 attributed to obsolescent longitudinal ridging (about sixty bead-like 

 prominences can be counted on one near the middle of the valve). 

 Inner surface not exposed, but the apical portion probably projected 

 fi'eely to some extent. 



Length, circa 22-4 mm. ; greatest breadth, 11-6 mm. 



Comparison with other Species. — B. {?) fimbriatus agrees in general 

 form with the carina described as B. (?) tithonicus, sp. nov., and 

 both valves are evidently of the same type. B. (?) tithonicus differs 

 rgreatly in size, being more than twice the length of B. {?) Jimbriatus ; 

 it differs also in having rather more steeply inclined sides, in the 

 absence of longitudinal ridges, in the transverse ridges being straight 

 and not closely and regularly undulatory, and in the spaces between 

 the transverse ridges being smooth. 



B. (?) Jimhriatus approaches more closely to the carina of Pollicipes 

 rigidus, J. de C. Sowerby,^ from the Gault (Albian), especially to those 

 examples that are more strongly ridged longitudinally, than to the 

 other Jurassic species. P. rigidus is distinguished from Brd,chylefas{'i) 

 fimlriatiis by its much finer ornamentation, particularly in the 

 longitudinal ridges, which are very much finer and twice as numerous ; 

 the transverse ridges are less regular, and although somewhat 

 undulatory, are not regularly and closely undulatory, neither have 

 they the peculiar goffered appearance as in B. (?)Jituhriatus. Moreover, 

 the transverse ridges are sharp-edged, and the spaces between them 

 are not tranversely ridged as in B. (?) fimhriattis. 



B. (?) tithonicus resembles in general form the carina of the Upper 

 Senonian species Pollicipes fallax, Darwin (now referred to the genus 

 Brachylepas by Dr. H. Woodward). In B. fallax- the transverse 

 ridges are not nearly so prominent or so regularly spaced, nor have ' 

 they the beaded ornament on their summits as inB. (?) tithonicus; the 

 transverse ridges are also much more strongly concave in the middle 



^ J. de C. Sowerby, Trans. Geol. Soc. London, ser. II, vol. iv, p. 335, 

 pi. xi, fig. 6*, 1836 ; C. E. Darwin, Pal. Soc. Mon. Foss. Lepadidse, p. 73, 

 pi. iv, fig. 7, 1851. 



^ H. Woodward, Geol. Mag., Dec. V, Vol. Ill, p. 341, Figs. 5-7, 1906. 

 This and subsequent references are to published figures of the carina of the 

 different species, and are not necessarily the references to the original 

 ■description of the species. 



