Volume 15, 1882
– 92 –

Description of Plate IV.
Phreatoicus typicus.
| Fig. 1 |
Lateral view of the animal X 5. |
| 2. |
Upper antenna X 30; a, auditory cilium from the same, more highly magnified. |
| 3. |
Base of lower antenna X 13. |
| 4. |
Side view of the head, showing the mouth organs in position, X 15; a, labrum; b, mandible with appendage; c, the two lobes of first maxilla; d, second maxilla; e, maxillipede withf, the rounded plate at its base. |
| 5. |
Mandible, view of inner side X 30. |
| 6. |
Labrum X 30. |
| 7. |
First maxilla X 30. |
| 8. |
Second maxilla X 30; a, seta rom middle lobe of same, more highly magnified |
| 9. |
Maxillipede X 30. |
| 10. |
Distal portion of first thoracic leg X 30. |
| 11. |
Seventh thoracic leg X 13; a, end of same X 30. |
| 12. |
First pair of pleopoda X 13. |
| 13. |
Second pair of pleopoda X 15. |
| 14. |
Extremity of abdomen, side view, X 14. |
| 15. |
Portion of the integument X 120. |

