26 FOSSIL CIRRIPEDIA. 



In the recent condition, the compartments of the dead shell fall apart with singular 

 facility; and Sir Charles Lyell has remarked ('Philosophical Transactions,' L835, p. 37) 

 that in the glacial deposits of Scandinavia, the shell is never found whole, but the separated 

 compartments in abundance : it appears, also, that the basis likewise easily separates from 

 its support. The extreme edge of the basis is finely crenated, and not pitted as in Bal. 

 crenatus ; the crenations or teeth are produced by the edge of the basis fitting in between 

 the longitudinal septa on the internal surface of the parietes. There is one peculiarity in 

 the alae of this species in its recent state, which I have observed in no other species, and 

 which can be distinguished in some of the fossil specimens, as in Tab. II, fig. lb, — 

 namely, the presence of an excessively fine linear furrow running along the sutnral edge, 

 a little towards the inner side, and filled (in the recent state) with a yellow ligamentous 

 substance. 



In regard to the opercular valves, (Tab. I, fig. la — Id, drawn from recent and glaciul 

 specimens,) I need here only mention, that in the scuta, their flatness, elongation, and delicate 

 longitudinal striae, are their chief characteristics. Jn very old and large specimens of the 

 terga (as in the specimen, fig. Id, figured from Uddevalla), the basal margin on the carinal 

 side of the spur slopes down towards it in a remarkable manner. 



8. Balanus bisulcatus, Tab. II, fig. 2a — 2k. 



Balanus sulcatinus (?) Nyst, apud D'Omalius (sine descript. aut tabula), Geologie 



de Belgique, 1853. 1 



B. nee parietibus, nee radiis pons perf oralis ; basi pons magnis perforata ; radiorum 

 marginibus superioribus obliquis, lavibus ; aciebus suturalibus Icevibus ; scuto angusto, sulci s 

 longitudinalibus 2 ad 4 ; tergi calcare brevissimo dimidid valves latitudine. 



Neither walls nor radii permeated by pores; basis permeated by large pores; radii 

 with their upper margins oblique and smooth ; sutural edges smooth ; scutum narrow, 

 with from two to four longitudinal furrows ; tergum with the spur very short, broad as 

 half the valve. 



Var. plicatus (fig. 2c), with the walls deeply folded ; radii narrow, with their upper 

 margins very oblique. 



Fossil in Coralline Crag ; Ramsholt, Gedgrave, Sutton ; Mu8. S. Wood, Bowerbank, J. de C. Sowerby. 

 Rauville, dans le Cotantin, Mus. G. B. Sowerby. Var. plicatus, Coralline Crag, Sutton, Mus. S. Wood, 

 Bowerbank, Bolderberg, near Hasselt, Belgium, Mus. Bosquet. 



1 I am indebted to M. Bosquet for a specimen, bearing this name and reference, found in the ' Systeme 

 Bolderien' of Dumont, (miocene according to Sir C. Lyell) at Bolderberg. The specimen consists of a 

 rostrum, with a portion of the base attached ; and as these parts are in some degree characteristic, I fully 

 believe this specimen to be B. bisulcatus. 



