26 FOSSIL CIRRIPEDIA. 
In the recent condition, the compartments of the dead shell fall apart with smgular 
facility ; and Sir Charles Lyell has remarked (‘ Philosophical Transactions,’ 1835, 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 fittmmg in between 
the longitudinal septa on the internal surface of the parietes. There is one peculiarity in 
the alze 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. 16,— 
namely, the presence of an excessively fine linear furrow running along the sutural 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. 7a—7d, drawn from recent and glacial 
specimens,) I need here only mention, that in the sczta, their flatness, elongation, and delicate 
longitudinal strize, are their chief characteristics. In very old and large specimens of the 
terga (as in the specimen, fig. 7d, figured from Uddevalla), the basal margin on the carinal 
side of the spur slopes down towards it in a remarkable manner. 
8. Bauanus Bisutcatus, Tab. II, fig. 22—2A. 
BaLANus suLcatinus (?) Myst, apud D’Omalius (sine descript. aut tabula), Géologie 
de Belgique, 1853.1 
B. nec parietibus, nec radiis poris perforatis ; basi poris magnis perforata ; radiorum 
marginibus superioribus obliquis, levibus ; aciebus suturalibus levibus ; scuto angusto, sulcos 
longitudinalibus 2 ad 4; tergi calcare brevissimo dimidia valve latitudine. 
Neither walls nor radii permeated by pores; basis permeated by large pores; radu 
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; radi narrow, with their upper 
margins very oblique. 
Fossil in Coralline Crag ; Ramsholt, Gedgrave, Sutton; Mus. 8S. 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 ‘ Systéme 
Bolderien’ of Dumont, (miocene according to Sir C. Lyell) at Bolderberg. The specimen consists of a 
rostrum, with a portion of tie base attached; and as these parts are in some degree characteristic, I fully 
believe this specimen to be B. bisulcatus. 
