Dr. H. Woodtcai'd — A New Cirn'pede from the ChaJk. 149 



Nor can we place it. as I at first couceived to be possible, in 

 Darwin's subfamily ChthamalinEe, which embraces Chthamalus, 

 Chamccsiylio, Pachylasma, Octomeris, and Catophragmns, all of 

 which are very irregular and aberrant forms of lialaninge, of 

 which the same author observes that they differ in many important 

 respects from the Balaninai proper and approach the Lepadidaj, 

 as, for instance, in the supplemental whorls of imbricated scales or 

 compartments in Catophragimts, etc. 



We should, I think, rather regard this Cretaceous type as an 

 ancient pedunculated Cirripede, which, judging from the form and 

 thickness of its carina and rostrum, appears to be assuming a more 

 sessile condition of growth, and by a later and further modification 

 may have become completely so. 



From the undisturbed triple or quadruple arrangement of imbri- 

 cated scales enclosing the base it is quite certain that the carina (c.) 

 and rostrum (r.) (PI. VllT, Fig. 4a) could not have united to form 

 a conical shell-wall like that in Fijrgoma anglicim (PI. VIII, Fig. 5), 

 as I originally supposed, nor do I think it could have had other 

 lateral compartments between r. and c. to complete the shell-wall 

 on the Bfdnmis type of structure, the large size of the scales in the 

 centre suggesting rather that they were the sub-latera, as in the 

 capitulum of Follicipes. It seems much more probable that the 

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

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

 protected by a series of imbricated shelly plates. In point of fact 

 we have here a Follicipes which has abandoned its peduncle, and 

 whilst still retaining the rows of imbricated scales at the base of its 

 capitulum, has settled down into the preliminary stage of becoming 

 a permanently sessile form. 



. = rostrum. 



.s. = imbricated scales. 



.1. = sub-latera. 



= carma. 



= imbricated scales at 

 base of capitulum. 



s.l. 

 Fig. Z.—Bmchyh'pa.vyetacca, geu. nov. (capitidum restored). Tlicori-inal figure 

 of Dr. Rowe's specimen is here reproduced aud restored by tlie ;«ddit.ou ot 

 / latus • «. scutum ; t. tergum. The rostrum {r.) and caruia (c.) aud the 

 imbricated scales [\.s., i.s.) are copied from the origmal figure. 



As Lepas was the name originally given by Linnaeus to embrace 

 both the pedunculated and sessile species, the designation Brachjhpas 

 may serve to express the present type, which embraces characters 

 apparently common to botli divisions of Cirripedia. The trivial 

 name cretacea is of course retained. 



, The new form should, I think, be placed in a separate family, 

 intermediate between the Pedunculata and Operculata, as— 



