Carpenter, William Benjamin, 1813-1885 · London : John Churchill · leaf 622
the diameter of thesecanals, as shown m differeiit transverse sections of one andthe same shell, ^villvary according tothe part of its thick-ness which the sec-tion happens to trei-verse. The differentspecies of Terehra-hdid<2, however,present very strik-ing diversities inthe size and close-ness… … Vertical sections of Shell of Terehratiila (Wald-heimia) australis: — showing at a the canalsopening by large trumpet-shaped oriiiees on theoutet surface, and contracting ^.t dd into nar-row tubes; and presenting at b a biftucationof the canals. 600 MOLLUSCOUS ANIMALS GENERALLY. state, by tubular…
Microscopy
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