. The Cambridge natural history. Zoology. ASCIDIAE SIMPLICES ASCIDIIDAE 73 present (Fig. 15, p. 40); Bhodosoma, Ehrenberg, anterior part of test modified to form operculum (Fig. 34, D) ; Ahyssascidia, Herdman, intestine on right side of branchial sac. The type genus of this section, Ascidia, has been described in detail above (Chapter II. p. 39), and Figs. 15 to 26 illustrate its structure and life-history. There are many species. Oiona intestinalis, Linn. (Fig. 40, B), is one of the commonest of British Ascidians, and lives readily in aqutiria. Sub-Fam. 3. Corellinae. — Stigmata curved and fo
. The Cambridge natural history. Zoology. ASCIDIAE SIMPLICES ASCIDIIDAE 73 present (Fig. 15, p. 40); Bhodosoma, Ehrenberg, anterior part of test modified to form operculum (Fig. 34, D) ; Ahyssascidia, Herdman, intestine on right side of branchial sac. The type genus of this section, Ascidia, has been described in detail above (Chapter II. p. 39), and Figs. 15 to 26 illustrate its structure and life-history. There are many species. Oiona intestinalis, Linn. (Fig. 40, B), is one of the commonest of British Ascidians, and lives readily in aqutiria. Sub-Fam. 3. Corellinae. — Stigmata curved and forming spirals (Fig. 35). Three genera:—Corella, Alder and Hancock, test gelatinous, body sessile; Corynascidia, Herdman, test. ^^V^ ; U(S B Fig. 35.—A, branchial sac of Oorynascidia suJiTn-i, Herdman ; B, branchial sac of Om-ella japonica, Herdman. , Internal longitudinal bars ; tr, transverse vessels. (After Herdman.) gelatinous, body pedunculated (Fig. 34, C), a remarkable deep- sea form with very delicate spirally-coiled vessels in the branchial sac (Fig. 35, A), found in the Pacific (2160 faths.) and the Southern Ocean; Chelyosoma, Brod. and Sowb., upper part of test modified into horny plates (Fig. 34, B). Corella contains several British species, one of which, C. paralldogramma, 0. F. MlilL, is one of the commonest and most handsome Ascidians in our coralline zone (about 20 faths.). Through its clear crystalline test the lemon-yellow and carmine pigmentation of the mantle, and even (with a lens) the working of the cilia along the spiral stigmata of the branchial sac (compare Fig. 35, B)i can readily be seen. The beating of the heart can be seen just in front of the viscera upon the right side of the branchial sac (compare with Ascidia, Fig. 23). In the family Ascidiidae the eggs are minute and contain. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these ill
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