Natural history . B. Polymastia invaginata Eirkp. ; p. 15.(Note. The surface pile is, in the natural condition, more upright than in this specimen, where ithas been crushed down.) C. The larger of the two small specimens above C is Sphaerotylus capitatusVosmaer, nat. size ; p. 18 ; the smaller is S. anta/rdicus. Figs. 2, 3.—Sphaerotylus antarcticus, young specimens. Nat. size. Fig. 4.—Portion of another young specimen (x 25). Fig. 5.—Sphaerotylus antarcticus. A spheroidal specimen. Nat. size. Fig. 6.—Style from radiating main fibre (x 100). Fig. 7.—Style from inner cortical tangential layer (
Natural history . B. Polymastia invaginata Eirkp. ; p. 15.(Note. The surface pile is, in the natural condition, more upright than in this specimen, where ithas been crushed down.) C. The larger of the two small specimens above C is Sphaerotylus capitatusVosmaer, nat. size ; p. 18 ; the smaller is S. anta/rdicus. Figs. 2, 3.—Sphaerotylus antarcticus, young specimens. Nat. size. Fig. 4.—Portion of another young specimen (x 25). Fig. 5.—Sphaerotylus antarcticus. A spheroidal specimen. Nat. size. Fig. 6.—Style from radiating main fibre (x 100). Fig. 7.—Style from inner cortical tangential layer ( x 100). Fig. 8.—Spherostyle (x 100) ; 8a head of same (x 425). Figs. 9-12.—Heads of various spherostyles (x 425). Fig. 13.—Slender curved choanosomal tyle (x 100). Fig. 14.—Beaded tyle from radial fibres (x 425). Fig. 16.—Curved cortical tyles of outermost layer of cortex (x 100); 15a, the same (x 160). Fig. 16.—Straight tangential tyle of lower cortical layer (x 100) ; 16a, the same (x 425).. P f: 5 I .i|l n R itarcti c (K s c ove i -yj Exp, Sponges Pi. 12 1 Hiqhlt-, liOuclon . PLATE XIII. Fig. 1.—Sphaerotylus antarcticus. Section of young specimen (x 3). Fig. 2.—Section of same (x 20). Fig. 3.—Dermal pores (x 100). Fig. 4.—Inner surface of cortex showing terminations of pore canals ( X 100). Fig. 5.—Horizontal section of papilla (x 15). Fig. 6.—^Vertical longitudinal section of papilla (x 15). Fig. 7.—Diplodal flagellated chambers (x 400). Fig. 8.—Sphaerotylus capitatus (Vosmaer) choanosomal tyle (x 100) ; 8a, head of the same (x 160). Figs. 9, 10.—Smaller tyle and sub-tyle from spread out ends of radiating fibres of skeleton (x 160). Fig. 11.—Cortical tyle, also found in choanosome between the main fibres (x 100). Fig. 12.—Smallest kind of cortical tyle (x 100) ; 12a, the same (xl60). Fig. 13.—Exotyle ( x 100); 13a, clavate head of same (425).
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