Plate IX. 



Page 



Fig. I. Halichondria panicea Pall. Oxea, x 165 17 



— 2. Halichondria gevitrix O. S. Oxea, a of the larger ones, b of the .smaller ones, 



c monstrous forms, x 165 18 



— 3. Halichondria fibrosa Frstdt. Oxea, a of the larger ones, b of the smaller ones, 



c oxeum with a swelling in the middle, x 165 20 



— 4. Halichondria velamentosa Arm. Hans. Oxea, x 165 22 



— 5. Halichondria velamentosa Arm. Hans. Dermal membrane from the oscular side, 



with a few pores, x 54 — 



— 6. Halichondjna velamentosa Arm. Hans. Dermal membrane from the pore side, 



X 54 - 



— 7. Halichondria oscnlitm n. s\>. Oxea, x 165 23 



— 8. Halichondria osculttm n. sp. Dermal membrane, x 38 — 



— 9. Halichondria oscrthim n. sp. Membrane from the oscular cavit>', x 33 — 



— 10. Halichondria oblonga Arm. Hans. Oxea, x 165 24 



