218 BALANID^E. 



completely as in the following species, and as in those in the suc- 

 ceeding sections of the genus ; this is what might have been expected 

 from the close affinity of B. stultus to B. Ajax, in which latter the 

 radii are still permeated by pores, though smaller than is general in the 

 species of our first section (A). The alee have their summits extremely 

 oblique, and their sutural edges, I believe, smooth. Basis porose, 

 with an underlying, finely-cancellated layer. 



Mouth : labrum with six small teeth ; mandibles with the 3d tooth 

 blunt; the 4th minute, and the ;>th almost confluent with the inferior 

 angle. Maxillae with the edge straight and simple. Cirri partly de- 

 stroyed ; on each segment of the sixth pair there were five pairs of spine*. 



10. Balanus calceolus. PL 3, fig. '6 a — 3 e. 



Bal.lnus calceolus keratopuyto involutus (?) Ellis. Phil. 



Trans , vol. 50 (1758), Tab. 31, fig. 19. 

 Lepas calceolus (?) Pallas. Eleneh. Zoopli., p. 19S, (sinedeseript.) 



(1766). 

 Conopea ovata (?) /. E. Gray. Annals of Philosophy, vol. x, 1825. 



Parietes and basis porose. Scutum with the pit for the 

 lateral depressor muscle sat all and deep. 



Ilab. — Attached to Gorgonia?, West Coast of Africa. Tubicorcen, near 

 Madras, (Dr. Johnston), associated with B. navicula. Mediterranean (?). Mus. 

 Brit., Cuming, Stutchbury. 



Fossil Coralline Crag; Mus. S. Wood. 



I must premise, with respect to the nomenclature of this 

 and the three following quite distinct species, 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 gm\!ed 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 Linnoeus' original specimens (accord- 

 ing to a statement by Spengler) came from the West 

 Indies. I have assigned new names to the two remain- 

 ing East Indian species. I may here add that Spengler 

 ('Skrifter af Naturhist.' 1 B, tab. b\ fig. 3, 1790) has 

 described, under the name of B. cassis, an allied form 

 attached to the G organ ia placomus from the seas of 



