Cretaceous and Tert'uirij Ctrri/icdes. Ill 



]n'ociscly tlic same. As to the remaining valves that liave 

 i)eeii attributed to this species, it is extremely douhtful 

 ulii'thcr they really belonj^ to it, and, in view of the relation- 

 ship of this species to P. rit/idus, there is good reason to 

 l)rli{;ve that it had no lower whorl of valves. 



liosquet (1857) figured as belonging to this species a 

 scutum, tergura, carina, rostrum, subcarina, subrostrum, 

 an upper latus, and seven valves of the lower whorl. 

 IJ. Woodward (1906) figured corresponding valves, with the 

 exception of the subcarina, but with the addition of two 

 cariual latera, all the valves having been found together in a 

 large j)yramidal Hint. lie referred ihe species to his genus 

 Brachylepas. 



Through the kindness of Mr. R. M. Brydone, F.G.S., 

 I have been enabled to examine the whole of his Tiimingham 

 specimens of P. fallax that were described by Dr. Woodward 

 (190(5). In that paper some carinoe, rostra, and a supposed 

 subrostrum were figured, but, in my opinion, fig. 8 is a 

 small carina, and not a rostrum, and the valve figured 

 (fig 10] as a subrostrum is merely a young and smaller 

 example of a rostrum. Among the valves collected by 

 Mr. lii-ydone there are small carinas, and there is no reason 

 why there should not be correspondingly small rostra. The 

 two caiinal latera figured as belonging to P fullax really 

 belong to Sca/pe/linn, lig. 19 being a carinal latus of S.fos- 

 sida and fig. 20 being a similar valve of S. max'nwim ; and, 

 although the valve represented by fig. 19 was found attached 

 to a carina of P. fallax, it certainly does not belong to that 

 species. It is of almost the same length as the carina, and 

 is consequently much too large to have belonged to the same 

 individual, as suggested by Dr. Woodvt'ard, even if it were a 

 valve of the same species. Of the loAver latera figured by 

 Dr. Woodward, that in the upper figure (fig. 23) agrees very 

 well with the imbricating plates in Bruchijlepas naissanti, 

 and |)robably belongs to that species ; but the lower figure 

 (fig. 2-i) represents only the broken apical portion of a 

 i-ostrum of P. fcdlax, and on the inner surface can be seen 

 the fiatly rounded growth-lines typical of the rostrum of 

 P.f(dlax and allied species, the growth-lines indicating the 

 free projection of the apex. 



In identifying these valves and referring them to Brachy- 

 lepas Dr. W^oodward evidently overlooked the fact that in 

 the type-species there is no subrostrum, and that in his 

 restoration there is no place for such valves or for the com- 

 paratively large carinal latera. 



Ann. tC- May. N. Hint. ►Ser. 8. Vol. xiv. 12 



