BALANUS. 15 
2. Bauanus cauceouus,* Tab. I, fig. 2a—2d. 
BALANUS CALCEOLUS KERATOPHYTO INVoLUTUS (?) Hillis. Phil. Trans., vol. 50 (1758), 
Tab. 34, fig. 19. 
Lepas catcnotus (?) Pallas. Elench. Zooph., p. 198, (sine descript.) (1766). 
Conopra ovata (?) J. #. Gray. Annals of Philosophy, vol. 10, 1825. 
B. teste axe rostro-carinali elongato ; bast cymbiformi ; parietibus et basi, sed non 
radiis, poris perforatis. Scuto museuli depressoris lateralis fossd parvd, profunda. 
Shell with its rostro-carinal axis much elongated; basis boat-shaped; walls and basis 
porose, but not the radii. Scutum with the pit for the lateral depressor muscle small 
and deep. 
Fossil in Coralline Crag, attached to a Gorgonia; Sutton; Mus. S. Wood. 
Recent, attached to Gorgonie, West Coast of Africa. Tubicoreen, near Madras. Mediterranean (?). 
I have seen only a single fossil specimen of this species, nearly half an inch in length, The 
shell was perfect, and a small portion of the Gorgonia yet remained attached to the grooved 
and boat-shaped basis. ‘The opercular valves had been lost, but the shell in this instance 
is so peculiar, that it could only be confounded with the recent B. galeatus, cymbiformis, 
or zavicula, and from all these it is easily distinguished by the parietes beg permeated 
by pores. It is, of course, possible, that the opercular valves might present some new 
character, showing that this fossil, though agreeing with Bal. calceolus in its shell, yet 
was specifically distinct. I have given a drawing of the opercular valves from recent 
specimens, which have been fully described in my Monograph on the Balanide. In 
regard to the shell, the fossil specimen could not be distinguished from the recent; and 
as it had to be broken, in order that its internal structure might be examined, I have 
thought it best to give a drawing from a perfect recent specimen. The spur of the 
tergum, in recent specimens, sometimes presents a singular character, in being irregularly 
toothed, and I have given a drawing (fig. 2d) of this variety, as it might perplex a collector. 
1 With respect to the nomenclature of this and three allied recent species, I must remark that in the 
published descriptions no allusion is made to any one of the characters by which alone they can be 
distinguished: hence I have been guided by geographical probabilities in assigning the specific name of 
calceolus to the present species, as Ellis’s specimens came from the Mediterranean ; and that of galeatus to 
the North American and West Indian specimens, as Linnzus’ original specimens (according to a statement 
by Spengler) came from the West Indies. I have assigned new names to the two remaining East Indian 
species. 
