Homes or Tubes formed hi/ Anueliils. Li 



'^ 



Yis. o. 



S^ 



Fiir. 



£^:--_::ra 



Fi?. 8. 



pjcr. 4.— Tube of Amphidene auricoma. About three times natural size. 



yQ:. 5. Portion of tube of Amphictene auricoma. Enlarged uuder a lens. 



FiJi-, 6. Tube of Amphidene auricoma formed of sponge-spicules. About 



thrice the natural size. 

 Fig. 7. — Portion of fig. 0, enlarged under a lens. 

 Yvr. 8. — Portion of fig. 6, more highly magnified. 



