. A manual of zoology. Zoology. Fig. 316. â Pythonnster murrayi. CAfter ,'=!laflen.) Aboral view showing anibuLacral grooves. Class II. Ophiuroidea (Brittle Stars). In these the animal consists, as in the Asteroidea, of disc and arms, the latter sometimes branched, but the internal anatomy is different. The ambiilacral plates have been drawn inside the arm and each pair fused to a large 'vertebra' (fig. 317). As a result the cualom of the arms is greatly reduced, the hepatic caeca are lack- ing, and the alimentary canal, which lacks an anus, is confined to the disc. By the ingrowth of ven- Fio
. A manual of zoology. Zoology. Fig. 316. â Pythonnster murrayi. CAfter ,'=!laflen.) Aboral view showing anibuLacral grooves. Class II. Ophiuroidea (Brittle Stars). In these the animal consists, as in the Asteroidea, of disc and arms, the latter sometimes branched, but the internal anatomy is different. The ambiilacral plates have been drawn inside the arm and each pair fused to a large 'vertebra' (fig. 317). As a result the cualom of the arms is greatly reduced, the hepatic caeca are lack- ing, and the alimentary canal, which lacks an anus, is confined to the disc. By the ingrowth of ven- Fio. .317.â Section of Ophiuroid arm tral plates the ambulacral grooves (orig.). a, amt)iilacruin; /j, blood ves- , t ⢠j_ j_ i i xi sei;c, cceiom; 1)1, muscles of arm; 71, are converted iiito tuDcs, and. the nerve; r, radial water tube; v/verte- , , i â i i i i ⢠_ bra' (coalesced ambulacral plates). ambulacra, which lack SUCking discs, are tactile organs, locomotion being effected by the snake- like motion of tlie arms. The madrunorite is on the ventral snr-. 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectzoology, bookyear1902
