104 Mr, Gray on the Genera of Cirripedes, fAuei 



' Fam, IV. Balanidje. 



Shell of the body, four, six, or eight-valved ; operculum four* 

 valved, oblique, valves articulated, ^ase none, or shelly, imita- 

 ting the substance to which it is attached. Attached to all sorts 

 of marine bodies, 



* Shell of the body six-valved ; valves unequal; the lateral ven^ 

 tral pair smaller than the rest, 



Ba la n us. Lister (n . 2). 



Body conical; six-valved ; operculum conical acute, four- 

 valved. 



^. Tintinnabulum, ^rwg.. 



There are two species in the Museum named Elminius, by 

 Dr. Leach, which ni the dissected specimens have only four 

 valves displayed, by which character tne Dr. most probably in- 

 tended to separate this genus ; but on examining the other speci- 

 mens, the six valves are very distinctly to be seen ; so that they 

 are true Balani. The opercula appear nearly horizontal; they 

 toay be what is intended by the following genus, which I 

 nave not seen ; this idea is strengthened by one of the species 

 being from Sicily. 



' Chthalamus, Ranzani in, 20), 



Body very depressed ; valves six; area very prominent, nearly 

 equal? The internal plate short; base membranaceous; mouta 

 nearly equally four-sided ; operculum somewhat pyramidical 

 four-valved, horizontally attached by a membrane to the mouth. 



C. stellatus, Ranz. Poll Moll. t. 5, f. 12—17. 



"** Body, four or eight valved ; valves unequal ; substance often 

 thick, porous; base none. 



OcTOMEiiis, Soicerbij, 



Body depressed ; conical ; valves eight, thick ; operculum 

 subconical ; four-valved. 



0. Stuchburii, Gray, Africa? 



I have seen this»shell in the shop of Mr. G. Sowerby ; who 

 is, I understand, about to describe it under the above generic 

 name. 



Tetraclita, 5lAww. n. 10. 

 ■ Btody, cotiicaK; valves four ; operculum, four-valved. 

 ^\'Asemus, Ranzani ; sutures oj' the valves indisti?tct. 



1. A. stalactifera, Ranz, Blain, Ency, Method, t, 165, f. 9, 

 10. C.^orosa, Leach ? ' ' ' ; . '^ ^ , 



tfConia, Ranz, (not Leach); sutures vert/ aistincL. 

 T. C. radiata, Ranz, Blain, Ency. Method, t. Iq4,, f- 15. 

 Tetraclita squamulosa, S'chum. L. J ungites, C^ew?; yiu* i» 98^ 



'•8f- . , .. .,..•' M;^T.i-- 



Verruca, Schiun. n. 11. 

 ' Body depressed, four-valved, valves oblique, sulcated j 

 operculum convex, four-valved ; valves soldered, 2 ^nd 2. 



