52 
Figg. 10—11. Isops sphaeroides n. sp. 
(natural size.) 
Fig. 10. Specimen with smooth surface. 
Fig. 11. Specimen the surface of which is rugged by protruding spicula. 
Figg. 12—13. Polymastia penicillus (Mont.) Vosm. 
(natural size.) 
Fig. 12. External of the Sponge, attached on a Worm-Shell. 
Fig. 13. Section of specimen attached to a little stone. 
Fig. 14. Pachychalina caulifera n. sp. 
(natural size.) 
Fig. 14. View from the side on which many great osceules are visibie. 
Fig. 16. Cribrochalina variabilis n. sp. var. crassa. 
(natural size.) 
Fig. 17. Cribrochalina variabilis n. sp. var. salpingoides. 
(natural size.) 
Fig. 18. Cribrochalina Sluiteri n. sp. 
(natural size.) 
Fig. 19. Alebion piceum n. sp. 
(3 of natural size.) 
Fig. 20. Auletta elegans n. sp. 
| (natural size.) 
Figg. 21—22. Suberites spec. (montalbidus Crtr.?) 
(natural size.) 
Fig. 23. Chalinula spec. (rubustior O. 8.?) 
(natural size.) 
Fig. 24. Tedania suetoria O. 8. 
(natural size.) 
Fig. 25. Suberites montiniger Crtr. 
(natural size.) 
Fig. 26. Amorphina spec. 
(natural size.) 
PLATETAL 
Figg. 1—21. Thenea muricata (Bwk.) Gray. 
Fig. 1. M. ta. d. bif. (d > d’) from the side; Hartn. IV, Cam. luc. Zeiss. 
Fig. 2. id. from the top. Hartn. IV, Cam. luc. Zeiss. 
Fig. 3. id. id. Specimen with remarkable short, blunt teeth d’. 
Hartn. IV, Cam. luc. Zeiss. 
