BALANUS. 15 



2. Balanus calceolus,* Tab. I, fig. 2a — 2d. 



Balanus calceolus kekatophyto involutus (?) Ellis. Phil. Trans., vol. 50 (1758), 



Tab. 34, fig. 19. 

 Lepas calceolus (?) Pallas. Elench. Zooph., p. 198, (sine descript.) (1766). 

 Conopea ovata (?) J. E. Gray. Anuals of Philosophy, vol. 10, 1825. 



B. testes axe rostro-carinali elongato ; basi cymbiformi ; parietibus et basi, sed non 

 radiis, poris perforatis. Scuto musculi depressoris lateralis fossa 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 Gorgonise, 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. yaleatus, cymbiformis, 

 or navicula, and from all these it is easily distinguished by the parietes being 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 Balanidae. 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 Linnaeus' 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. 



