216 BALANIDJE. 



its habit of being attached to Milleporse. By a close and unbroken 

 chain of affinities, B. Ajax, through B. stultas, is connected with 

 B. calceohfs and its allies in section (B), which live attached to 

 Gorgonire. Some of the specimens of B. Ajax, are almost as much 

 elongated in their rostro-carinal axis, as are the species in section (B) ; 

 and there is an affinity in the same direction in the smallness of the 

 pores in the radii of B. Ajax ; indeed, had the basis in this species 

 been generally more boat- or cup-formed, I should have placed it as 

 the first species in section (B), instead of, as at present, the last species 

 in section (A). The inter mediateness of the characters of B. Ajax has 

 been one chief cause why I have rejected the genus Conopea, which 

 was instituted by Say for the species living attached to Gorgonise. 



Section b. 



Parietes and basis sometimes permeated by pores, some- 

 tunes not : radii not permeated by pores : shell elongated in 

 its rostro-carinal axis : basis boat-shaped: attached to Gor- 

 gonice and Milleporce. 



9. Balanus stultus. PI. 3, fig. 2 a — 2 d. 



Parietes and base porose : shell white, or faintly tinged 

 irit It purple. Scutum with the basal margin protuberant in 

 the middle. Tergum with the longitudinal furrow closed in 

 the upper part : spur not closely adjoining the basi-scutal 

 angle. 



Hab. — Attached to Milleporce, Singapore, Mus. Cuming. West Indies,* 

 Mus. Brit. — Mus. Stutchbury. 



1 have considerable doubts whether it would not have 

 been more correct to have placed this species in the last 

 section, instead of where it now stands ; it certainly is more 



* This specimen in the British Museum was purchased at the sale of the 

 Rev. L. Guilding's collection, and therefore it is not certain that this habital 

 is correct; but as it was sold in the same lot with a Cirripede certainly West 

 Indian, and as the main collection was made in the West Indies, this habitat 

 may, 1 think, be trusted. 



