14 FOSSIL CIRRIPE.DIA. 



B.parietibus etbasi et radiis ports perf oralis : testa a rosed ad atro-purpur earn variante, 

 sape longitudinaliter virgatd et costata : orijicio plerumque integro, inter dum dentato. Scuti 

 crista articulari lata et rejlexd. 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. S. 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 Balanidse 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. 



