. The Cambridge natural history. Zoology. 3"- tissues—both homogeneous and fibrous — with cells, blood- sinuses, and many muscle - bundles large and small running circularly, longitudinally, and obliquely, and interlacing in all directions (Fig. 18, m). The muscles are all formed of very long fusiform non-striped fibres. The mantle in some Ascidians is often brilliantly pig- mented — red, yel- low and opaque white, the coloured cells being exactly like those found in the blood. re The mantle forms two well- marked siphons or ". short wide tubes, which lead in from r, the branchial an
. The Cambridge natural history. Zoology. 3"- tissues—both homogeneous and fibrous — with cells, blood- sinuses, and many muscle - bundles large and small running circularly, longitudinally, and obliquely, and interlacing in all directions (Fig. 18, m). The muscles are all formed of very long fusiform non-striped fibres. The mantle in some Ascidians is often brilliantly pig- mented — red, yel- low and opaque white, the coloured cells being exactly like those found in the blood. re The mantle forms two well- marked siphons or ". short wide tubes, which lead in from r, the branchial and atrial apertures. ^^. These are sur- rounded by strong sphincter muscles,^ and are lined by the invaginated ecto- derm and test. The one leads into the branchial sac or modified pharynx, and the other into. .end. --tjr ....st FlQ. 18.—Dissection of Ascidia, from riglit side, to show anatomy, a, Anus ; At, atrial apertnre ; Br, branchial aperture ; , ', branchial sac ; end, endostyle ; , genital ducts; gon, ovary; hyp, neural gland; , the duct leading to dorsal tubercle; m, mantle ; , ganglion ; oes, oesophagus ; , peribranchial cavity; ren, renal vesicles ; st, stomach ; t, test ; tn, tentacles ; ty, typhlosole. the"atrial or peribranchial cavity (see Fig. 18, and Fig. 19,). Fio-s. 18 and 19 show the relations of the branchial and peribronchial cavities to one another. The peribranchial cavity 1 These sphincters close the only openings through the tough test so effectually that when collectors are preserving Ascidians in alcohol it is advisable to make one or more slits in the test to allow the sea-water to escape and the spirit to Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett)
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
