. The Cambridge natural history. Zoology. OCCURRENCE 69 ) tall 3 cm.âit is of a bright red colour. (4) Fritillaria, Q. and G., in which the liody is elongated (Fig. 32) and composed of anterior and posterior regions, tlie tail relatively short, the endostyle Fig. 31. â⢠Transverse section of body and tail of Oikopleura flubellnm (?) cd, Atrial tube ; , 71. blood - space ; , cavity of pharynx or branchial sac ; ^"^ ec, ectoderm ; en, endoderm ; fJ>-J}, epipharyngeal cili- c/eZ. ^ted bauds ; gel, gelatinous layer be- tween ectoderm and endoderm ; hi/.p, liypophary
. The Cambridge natural history. Zoology. OCCURRENCE 69 ) tall 3 cm.âit is of a bright red colour. (4) Fritillaria, Q. and G., in which the liody is elongated (Fig. 32) and composed of anterior and posterior regions, tlie tail relatively short, the endostyle Fig. 31. â⢠Transverse section of body and tail of Oikopleura flubellnm (?) cd, Atrial tube ; , 71. blood - space ; , cavity of pharynx or branchial sac ; ^"^ ec, ectoderm ; en, endoderm ; fJ>-J}, epipharyngeal cili- c/eZ. ^ted bauds ; gel, gelatinous layer be- tween ectoderm and endoderm ; hi/.p, liypopharyngeal V " S \^-^\ \ ciliated band ; ?«, V y ' muscular tissue on ^~-^^ ^^----r. inner surface of ectoderm of tail ; ij n, nerve-cord ; n', .- _ its continuation in the tail : , noto- y chord in tail ; r, ^f. rectum ; sij, one of the stigmata or cili- ated openings from â the branchial sac to "â¢c^- ^*^- the atrial tube ; t, test (= young "house"); x, bridge of gelatinous tissue in front of stigma closing liranchial sac oft" from atrial tube. (After Herdman.) recurved, the stigmata opening far in front of the anus, and an ectodermal hood is formed over the front of the body. In all nearly forty species of Larvacea are known. Occurrence.âAlthough for the most part transparent, and usually almost invisible in sea-water, some Appendicularians may have certain parts of the body (alimentary canal, endostyle, gonads, etc.) brilliantly pigmented (orange, violet, etc.), and may under exceptional circumstances be present in such profusion as to colour tracts of the sea. Appendicularians are widely dis- tributed, having been found in all seas from the Arctic to the Antarctic, Ijoth round coasts and in the open ocean. Although a few species have been found at considerable depths in the Mediterranean, still in the Atlantic they are not deep - water animals, and as a group must be regarded as surface-forms. They are fairly abundant to a depth of
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
