A treatise on zoology (1900) (14780839875)

Identifier: treatiseonzoolo03lank (find matches)
Title: A treatise on zoology
Year: 1900 (1900s)
Authors: Lankester, E. Ray (Edwin Ray), Sir, 1847-1929 Bather, Francis Arthur, 1863-1934 Goodrich, Edwin S. (Edwin Stephen), 1868-1946
Subjects: Zoology
Publisher: London : A. & C. Black
Contributing Library: Robarts - University of Toronto
Digitizing Sponsor: University of Toronto



Text Appearing Before Image:
Fig. III. Asterias ruhens, ambulacral and adambulacral plates.o, apertures for podia. 242 THE STELLEROWEA The Alimentary System consists of a mouth at the centre ofthe actinal surface of the starfish. The oesophagus is very short
Text Appearing After Image:
Ki.i. iv. AsUrim rnhtn^. I, ray from wliicli tho sUiii of llii> nbacliiml smfiict^ h.is btvn n«mi.voilniirl tho oiitKiDVvtliH (.) <liMi.liic«Ml, sliowiiiK tlii« imibiiluonil ossidos ((to); Mio «uck<<rs (s);(/, kohuiIm ill ray II ; ((, anus; n/., .stniiiftcli, tho foldrd ftrrall^;rIlUMlt of iho w»lls of whu-h oreHlK)wr» by rtMin)val of part of tlif iipp.r wall at tiio base of ray V. Fn)in V. J. Hfll, CnMogxit0/liritiiih EUiiHuUnna in Ike Ihit. Alun. (t\ut. Hint.). THE STELLEROIDEA 243 and loads to a lar<^o sLoniadi, wliicli occupies most of the disc.From tlio stomach five branches pass off, one to each ray. Eachbranch divides into two caeca, which lie one on either side of theray. From (he stomach a short rectum leads upwaid to the anus,which opens on (he abactinal surface at a little distance from thecentre. Two small longitudinally folded diverticula from therectum occur l)elow the anus. These rectal caeca occupy asimilar ))osit ion to the respiratory trees of Pl