MR. HUXLEY ON DOLIOLUM AND APPENDICULARIA. 
60:3 
scriber, Prof. Muller, confesses that he does not know in what division of the 
animal kingdom to place this creature ; and his account of its structure is not a little 
vague, including little more than its mere external appearance. He does not seem 
to have observed anything corresponding to the ‘‘ Ilaus ” of Otto. 
Description of the Plates. 
PLATE XV. Salpa. 
Fig. 1. Salpa A. 
Fig. 2. Salpa B. 
Fig. 3. Dorsal view of Salpa A, the muscular bands being omitted. 
Fig. 4. Dorsal view of Salpa B, the muscular bands being omitted. 
Fig. 5. Intestinal canal of Salpa A. 
Fig. 6. Intestinal canal of Salpa B. 
Fig. 7- Dorsal view of extremity of Salpa B. 
Fig. 8. Part of the respiratory chamber of Salpa B, showing the foetus suspended. 
View from above. 
Fig. 9. Connection of the gemmiferous tube with the heart. 
PLATE XVI. Salpa. 
Fig. 1. Young gemmce {Salpa B) attached to the gemmiferous tube. 
Fig. 2. Nuclear end of one of these, showing the ovum and its pedicle or guberna- 
culum. 
Fig. 3. Nuclear end of a very young Salpa A, just detached. 
Fig. 3®. Placenta and gemmiferous tube of this enlarged. 
Fig. 4. Pleart, placenta and gemmiferous tube of a young Salpa A, showing the 
rudimentary condition of the last structure. 
Fig. 5. Ganglion, otolithic sac and languet. 
Fig. 6. Young Salpa A, still attached by its placenta in the interior of Salpa B. 
PLATE XVII. Pyrosoma. 
Fig. 1. A single ‘‘zobid,” viewed from the right side. 
Fig. 2. A single “ zooid,” viewed from above. 
Fig. 3. Part of the branchial network. 
Fig. 4. The ovum with its pedicle in situ. 
Fig. 5. Testis and ovisac in situ, both emptied of their contents. 
