Plate VI. 



Page 

 Fig. i. Iopho)i piccus Vosm. A very typical specimen, seen from the pore side; on the ridges the 



dermal membrane is mostly wanting. '/, 175 



— 2. Iophon piceus Vosm. A somewhat irregular specimen, seen from the oscular side. '/, . . 175 

 - 3. Iophon dubius Arm. Hans., growing on Phmmlaria sp. 1 j l 1S0 



— 4. Iophon dubius Arm. Hans. A specimen with free branches, broken off below, '/i 180 



— 5. Iophon dubius Arm. Hans. A specimen with partly coalesced branches, 1 j 1 J 8o 



— 6. Iotrochota oxrata 11. sp. An about lump-shaped specimen, growing on a fragment of Tin- 



ned muricata. '/, 1S6 



— 7. Iotrochota polydcutata n. sp., seen from the pore side, somewhat damaged. r /i x 9 2 



— 8. Iotrochota spiuosa n. sp. Broken off below. l j l 195 



