240 BALANIDiE. 



All the recent specimens which I have seen, were, with 

 one exception, attached to various shells and crabs, and to 

 each other. The Peruvian specimen was associated with 

 B. fosculus. The tertiary specimens are often congregated 

 together into great masses. Including the recent and fossil 

 specimens, this species encircles the globe. During the mio- 

 cene period it seems to have been the commonest existing 

 sessile cirripede ; now, it does not appear to be common, 

 excepting, perhaps, at Panama: Mr. Cuming procured only 

 one specimen from the Philippine archipelago. 



19. Balanus amphitrite. PL 5, fig. 2 a — 2 o. 



Lepas radiata. Wood's General Conchology (1815), PI. 7, fig. 7. 



— mtnor? Wood's General Conchology (1815), PI. 7, fig. 6. 



— balanoides. Poll. Testacea ntriusque Sicilian (1795), Tab. 5. 

 Balanus balanoides. Risso. Hist. Nat. de l'Europe Merid., 



torn, iv, 1820. 



Shell longitudinally striped with purple or pink ; some- 

 times with the stripes confluent; sometimes wholly tohitc. 

 Scutum internally with a prrominent broad adductor ridge. 



Var. (1) communis : (2 e, 2 h, 2 I,) nearly white, with pale or dark 

 violet-coloured longitudinal stripes : epidermis rarely persistent : shell 

 either thin or thick : radii white or freckled with reddish mahogany 

 colour, with their summits either oblique, sometimes in a high degree, or 

 nearly parallel to the basis : basal point of spur of the tergum either 

 square or bluntly pointed. Hab. Mediterranean, W. Indies, S. Africa, 

 Philippine Archipelago, New South Wales. 



Var. (2) venustus : (2 a,) white or pale pink, with narrow bright 

 pink, or broad pinkish-purple stirpes; orifice either much dentated 

 or nearly entire. Tergum with the carinal half of the basal margin 

 sometimes much hollowed out. Hab. W. and S. Africa, Ceylon. 



Var. (3.) pallidus : (2 c, 2 k,) white, with or without a yellowish 

 persistent epidermis ; sometimes with the edges of the compartments 

 tinted purple : radii moderately oblique : tergum generally narrow, 

 with the spur sharp, and the basal margin on its carinal side much 

 hollowed out. Hab. W. Africa, Madagascar, Red Sea. 



Var. (4) niveus : (2f) white, ivith longitudinal hyaline lines; 

 epidermis not persistent. Hab. W. Indies, Florida, S. Africa, &c. 



Var. (;")) modestus : upper part of shell white, lower part uniform 

 blueish-grey, opercular valves as in Var. (1). Hab. unknown. 



Var. (G) Stutsburi: (2d, 2i, 2m,2n,2o,) white, with or without pink- 

 ish-purple .stripes, which are often confluent, rendering the lower part of 



