PLATE XX. 



Fig. I. Versluysia argentea n. sp. Tvvo spicules, a and b. X 58. Only '/* of a is drawn. 



Fig. 2. Versluysia dentata n. sp. Two spicules a and b. X 58. 



F'g- 3- Versluysia rosea n. sp. A single spicule. X 58. 



Fig. 4. Versluysia reticulata n. sp. Half of a single spicule. X 58. 



Fig. 5. Acis squamata n. sp. A spicule. X 58. 



Fig. 6. Acis solorensis n. sp. A single spicule. X ;8. 



Fig. 7. Acis serrata n. sp. A group of three spicules, a, b and c. X S^- 



Fig. 8. Bebryce thomsoni n. sp. A group of four spicules, a, b, c and d. X 58, except 



"a" which is magnified 154 diameters. 



Fig. 9. Thesea simplex n. sp. A group of three spicules, a, b and c. X 58. 



Fig. 10. Thesea pallida n. sp. A group of three spicules, a, b and c. X 58, 



