. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. l8 ./.\'./y'tu/i' oj- AMrj/ioxi's. it. Fig. 3. â Anti-rior portion of l)ody of yoiini; tr,in>ii,iiciu indivkiuai. (After J. Mi , sliglitly altiTccLi ,â¢'/. N'otoelioni. ./. HiK' cirri. (â¢. l'>i'- spiit. r>iil. l-'nilostyK'. I''in-r;iys lyiiii; in tlif t'in-ch;inilit.'rs. i^'.i. (iill-Mits; tlic skt'lctal rods of the i^ill-hars arc indioatcd by b'ack liiifs. rit. Spinal ford, witli pii^nicnt L;rami!t'-; near its the bncca/
. Amphioxus and the ancestry of the vertebrates [microform]. Vertebrates; Chordata; Fishes; Ascidiacea; Vertébrés; Cordés; Poissons; Ascidiacés. l8 ./.\'./y'tu/i' oj- AMrj/ioxi's. it. Fig. 3. â Anti-rior portion of l)ody of yoiini; tr,in>ii,iiciu indivkiuai. (After J. Mi , sliglitly altiTccLi ,â¢'/. N'otoelioni. ./. HiK' cirri. (â¢. l'>i'- spiit. r>iil. l-'nilostyK'. I''in-r;iys lyiiii; in tlif t'in-ch;inilit.'rs. i^'.i. (iill-Mits; tlic skt'lctal rods of the i^ill-hars arc indioatcd by b'ack liiifs. rit. Spinal ford, witli pii^nicnt L;rami!t'-; near its the bncca/ Ciirtilni^is. As pointed out by Johannes Mu. tiiey arc not to be compared with the jaw-apparatus,: to the hyoid or ton bone ot the jaw-bear; Vertebrates, but t!-. belont; to the same a: _i;ory as the nioulh-ca: hiLTcs of the Cvclostn: fishes (which possess hyoid cartilage in at; tidii) and the labial r iiidi^cs of Selach:.:: (sharks). The absence of pair. eves antl of an)' kiini auditorV or>;an has b« ba>-. ;â .,;. I Jowni^rowlli from rii;lit lyins; nicntioncd aboVC. Tilt: to till' ri' lit ot tr/. liu'velum ; with velar ten- . tacles projecting; back into i)harynx. '. Kad- 'S, nOWCVCl, a IlK'th, eror^an; ciliated epithelial tracts on inner .....> which eonsistS (' of oral houd. - ' comparatively lar^e .. paired pigment spot lyins at the anterit)r extremity of: dorsal nerve-tube.* A row of similar, but much smaller, masses of pio;ment lie aloni; the floor of the spinal canal, commenciuL;' some distance behind the eye (b'ii;. 3). Immediately above and be- hind the eve-spot is a small r''T'"^'V''' -'i ;^'''';'''; ' basal |)ieces he end to end in tlicitu pit in the botly-Wall reachini;' .i,'in of oral hood, and each pi^ - , r 1 ' >cnds UP an axial i)rocess into !- trom the outer surface of the |.onding buccal cirrus. * The eye-spot lias been oliservcd to be so .etimcs broken up into t' pigmciU masses. (See AV
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectfishes, bookyear1894
