14 FOSSIL CIRRIPEDIA. 
B. parictibus et basi et radius poris perforatis : testé arosed ad atro-purpuream variante, 
sepe longitudinaliter virgata et costata: orificio plerumque integro, interdum dentato. Scuti 
eristd articulart laté et reflexd. Tergi margine basalt plerumque in contrariis calcaris 
partibus rectam lineam formante. 
Walls, basis, and radii permeated by pores; shell varying from pink to blackish 
purple, often striped and ribbed longitudinally; orifice generally entire, sometimes toothed. 
Scutum with the articular ridge broad and reflexed. Tergum with the basal margin 
generally forming a straight line on opposite sides of the spur. 
Fossil in the Red Crag (Sutton). Mus. 8. Wood, J. de C. Sowerby. Touraine (?) Mus. Lyell. 
Recent, on West Coast of Africa; Madeira; West Indies; Cape of Good Hope; Mouth of the Indus ; 
East Indian Archipelago ; Sydney, Australia; Peru; Galapagos Islands; West Mexico ; California. 
Of this species I have seen several specimens, and fragments. ‘Three of these are the 
original specimens figured in the Mineral Conchology, as B. crassus, an examination of 
which I owe to the great kindness of Mr. J. de C. Sowerby. Some specimens equally or 
more perfect are in Mr. S. Wood’s collection. I have further seen a specimen from 
Touraine, which was presented to Sir C. Lyell by M. Dujardin, under the name of 
B. fasciatus, which I fully believe to be B. tintinnabulum. None of these specimens had 
opercular valves, and therefore it is perhaps rash to assert quite positively that they are 
identical with B. tintinnabulum; but, extraordinarily variable as this latter species is, yet, 
after having examined so many hundreds of recent specimens from all quarters of the 
globe, a sort of instinctive knowledge of general aspect is acquired, which makes me feel 
convinced that the fossils in question do really belong to this species. Moreover, the 
large shell, with its trigonal orifice passing into rhomboidal,—the smooth, broad, finely 
porose radii, with their summits not oblique,—the rather large parietal pores,— 
and the cancellated basis, are characters which hardly concur in any other species; and 
those with which these fossils might be confounded, are inhabitants of distant quarters of the 
world. Most of the recent varieties of B. tintinnabulum, and all the fossil specimens from 
the Crag, can be at once discriminated from B. tulipiformis (with which, at least in the 
Mediterranean deposits, it is likely to be confounded) by the summits of the radii extending 
from tip to tip of the adjoining compartments, and therefore not being oblique, as is 
always the case with the radii of B. ¢tulipiformis. The largest fossil specimen which I have 
seen is nearly two inches in basal diameter, and nearly the same in height, and therefore 
about two thirds of the size of the largest living specimens. 
I have had engraved, from recent specimens, an internal view of the scutum and tergum, 
as these are likely hereafter to be found by searchers in the Crag deposits; and I may 
refer to my Monograph on the Balanidz for their full description. It may be observed in 
the habitats given of the living specimens, that Madeira is the nearest point where the 
species now lives and propagates; but specimens in full vigour are often brought to the 
British shores, attached to the bottoms of vessels. 
