. Papers and proceedings of the Royal Society of Tasmania . BY W. H. TWELVETREES AND W. F. PETTERD. 91 nates the branching network of white spicula, while thefleshy cirri are left dark, and only dimly visible. Thismethod of illnmination very effectively demonstrates the wayin which the internal spicular skeleton strengthens the arms. Fig. 3.—Transverse section of shell canals of KraussinaLamarckiana (the typical ribbed kind). This representsnearly the whole thickness of the shell, and shows theoblique direction of the tubular canals x 17. Ordinary light. Fig. 4.—Transverse section of shell can
. Papers and proceedings of the Royal Society of Tasmania . BY W. H. TWELVETREES AND W. F. PETTERD. 91 nates the branching network of white spicula, while thefleshy cirri are left dark, and only dimly visible. Thismethod of illnmination very effectively demonstrates the wayin which the internal spicular skeleton strengthens the arms. Fig. 3.—Transverse section of shell canals of KraussinaLamarckiana (the typical ribbed kind). This representsnearly the whole thickness of the shell, and shows theoblique direction of the tubular canals x 17. Ordinary light. Fig. 4.—Transverse section of shell canals of KraussinaAtkinsoni. Although the shell is somewhat smaller thanK. Lamarckiana, the canals are considerably wider. Thedark line in the centre is the mesial septum, x 17. Polarisedlight. 92 ISrOTES ON COEAL REEFS, WITH SPECIAL REFER-ENCE TO THE FUNAFUTI BORINGS. By T. Stephens, , It may be premised that the object of tbis paper is, not toannounce any new discovery, but merely to give a briefsummary of what is known of the history of co
Size: 1533px × 1629px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1860, bookidpapersprocee, bookyear1863
