T. E. Withers— The Cirripede Brachylepas cretacea. 355 



£. Naissanti differ mainly in that, instead of having a sharp ridge 

 with sloping sides extending from the apex to the basal angle as in 

 P. fallax, there is a prominent fold which on the tergal side is 

 abruptly folded downwards and inwards, as indicated in the transverse 

 section (Fig. 3a'). The transverse ridges are not so prominent as in 

 P. fallax. 



In the remarkable specimen upon which Dr. H. Woodward (1901) 

 founded the genus Brachylepas the more important of the valves 

 of the capitulum are absent, and the specimen consists of the carina 

 and rostrum, kept in position by three or four rows of imbricating 

 ' plates encircling their bases. There is evidently no distinct sub- 

 carma or sub-rostrum. Although Dr. Woodward refers in the early 

 part of his paper to the absent valves as "the opercular valves", he 

 subsequently says: "It seems much more probable that the scuta 

 and terga, and perhaps a small and narrow latus, took part, as in 

 Polhcipes, in building up the capitulum, the basis of which was 



Fig. 3. Gatophragmus 2Mlyments,T)&TVfin. Living: Australian coast. (After 

 Darwin.) Interior compartments eight, with several exterior whorls of 

 compartments, which in old specimens number ten or even more ; basis 

 membranous. 

 ,, 4. Srac%/epasiVaissfln^i, Hebertsp. Upper Senonian : England, France, 

 Germany, etc. Eestored capitulum. Capitulum comprising an upper 

 whorl of eight valves consisting of a carina, rostrum, paired scuta, paired 

 terga, and paired upper latera, with four whorls of imbricating valves below 

 the rostrum ; no distinct sub-carina or sub-rostrum ; outer whorls of valves 

 (probably three) possessing an inwardly projecting basal ledge, which is 

 fixed into the median notch of the valve immediately in front of it, 

 together forming a shelf or platform round the base of the capitulum ; 

 basis probably membranous. 



This restoration is based on the valves from Liineburg, which were 

 found embedded together in a small piece of chalk. The number and 

 position of the lower whorls of plates is based on the figure given by 

 Dr. H. Woodward in his paper (1901). r. rostrum ; s. scutum ; t. tergum; 

 c. carina; I. upper latus; s.r. sub-rostrum; s.c. sub-carina; c.l. carinal 

 latus ; r.l. rostral latus ; i.s. imbricating plates. 



protected by a series of imbricated shelly plates." He further says: 

 "From the disparity m the proportions of the rosti'um and carina 

 and the absence of alse, we arrive at the conclusion that the terga 

 and scuta were not mere opercular valves, but formed a part of the 

 capitulum." 



