PLATE XII. 



Undinella oblonga, G. 0. Sars. 



Fig. 1. Adult female, dorsal view. 



— 2. Same, viewed from left side. 



— 3. Adult male, exhibited from right side. 



— 4. Frontal part of body, lateral view. 



— 5. Rostral prominence, front view. 



— 6. Anterior antenna of female. 



— 6a. Distal part of same, more highly magnified. 



— 7. Anterior antenna of male. 



— 8. Anterior lip. 



— 9. Posterior lip. 



— 10. Extremity of tail, dorsal view. 



