PLATE XVIII. 



Ghiridius tenuispinus, G. 0. Sars. 



Fig. 1. Adult female, dorsal view (left anterior antenna not fully drawn). 



— 2. Same, viewed from right side. 



— 3. Frontal part of body, lateral view. 



— 4. Last segment of trunk, exhibiting the spiniform processes of the 



lateral corners, dorsal view. 



— 5. Posterior antenna. 



— 6. Mandible vrith palp. 



— 7. Maxilla. 



— 8. Anterior maxilliped. 



— 9. Posterior maxilliped. 



— 10. Natatory leg of 1st pair. 



— 11. Do. of 2nd pair. 



— 12. Do. of 4th pair. 



