PLATE IV. 



Fig. I. Plexaura aggregata n. sp. Group of 5 spicules, a, b, c, d, e. •' 1 12. 



Fig. 2. Plexaura attenuata n. sp. Group of 3 spicules, a, b and c. ■ II2. 



Fig. 3. Plexaura recta n. sp. Group of 3 spicules, a, b and c. < 112. 



Fig. 4. Plexaura platystoma n. sp. Group of 3 spicules, a, b and c. \ 112. 



Fig. 5. Plexaura pinnata n. sp. Group of 4 spicules, a, b, c, d. ■:. 112. 



Fig. 6. Plexaiira flava n. sp. Group of 4 spicules, «, ^, r, d. < 112. * 



Fig. 7. Euplexaura rubra n. sp. Group of 3 spicules, «, b and c. X 112. 



Fig. 8. Euplexaura mollis n. sp. Group of 4 spicules, a, b, c and ^. X 112. 



Fig. 9. Euplexaura reticidata n. sp. Group of 4 spicules, «, i5, c, d. < 112. 



Fig. 10. Hicksonella princeps n. sp. Group of 6 spicules, «■, ^, c, d, e and _^. x 112. 



a and i^ represent one of the two general types, and the rest the other, or tuberculate type. 



