flO Dr. lAesich on Cirripedes, 



* Basis cyathiformis aut infundibuliformis. 



.iramersa,valvaB indivisaB.4 Savignium. 

 immersa,valvaB bipartitae, 



indivisa: basis*^ angulares 5 Pyrgoma. 



immersa, valvae Balani . 6 Megatrema. 

 -Test -^ "^exserta, valvae Balani ..7 Adna. 



4-partita, valvae Balani 8 Creusia. 



/■ spinosae, versus apertu- 



sexpartita, valvie ) . ^^ ''''""«^ » ^'^'^- 



isiraplices, ad apertu- 



^ ram attingentes . . 10 Messula. 



** Basis polymorpha. 



sexpartita 11 Balanus. 



Testa < ,. ,., ^cellulosa 12 Conia. 



^quadrIpartlta < 



f solida 13 Elrainius. 



Familia 3. CLisiADiE. 

 Operculum testaceum, univalve, antice elevans. ' 



Testa quadripartita, solida ; operculum bipartitum . 14 Clisia. 



Genus OTION. 



Species 1. O. Bellianus. 

 O. squamis inferis arcuatis, infra angustioribus : postica infra 

 acuminata ; appendicibus auriformibus mediocribus, purpu- 

 rascente maculatis ; corpore super pedunculum utrinque 

 tittis tribus purpurascentibus, exteriore obliqua, posterioribus 

 rectis. 

 ; Hab. in Mare Hispanico ad Barcelonae littora. 

 Mus. uost. in Mus. Brit, cotnmunicavit mihi amicus carissimus 

 Thomas Bell, Arm. 

 Description.— The lower valves of this Otion are arched and narrow 

 at tiie lower part ; the posterior valve acuminated, auriform 

 appendages of moderate size, spotted with purplish, the body 

 above the peduncle with three purplish stripes on each side, 

 the outer of which is oblique and the posterior ones straight. 



