Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 915
al species) are usually deposited inaggregate masses, each inclosed in a common protective envelope ornidamentum. The nature of this envelope, however, varies greatly ;thus, in the common Limnceus stagnates, or water-snail, of our pondsand ditches it is nothing else than a mass of soft jelly, about… … Fig. 652.—A, Glochidium immediately after it is hatched : ad, ad-ductor; sh, shell; by, hyssus-cord; ,v, sense-organs. B, the samealter it lias heen on the fish for some weeks: or, liranchiiB; auv,auditory sack;/, food; a.ad and />.ad, anterior and posterioradductors; al, mesenteron ; mt,…
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