PLATE XXIII. 



Figs. 1-4. TJiysanoessa macrura, G. 0. Sars. 

 Fig. 1. Female, from left side ; magnified about ten times. 

 Fig. 2. Anterior part of body, from above. 

 Fig. 3. Extremity of tail, with caudal fan, from above. 

 Fig. 4. Preanal spine. 



Figs. 5-10. Nematoscelis megalops, G. 0. Sars. 



Fig. 5. Adult female, from right side ; magnified about six times. 



Fig. 6. Same, from above. 



Fig. 7. Preanal spine. 



Fig. 8. Anterior part of carapace, with the narrow rostral projection, fmn; left side. 



Fig. 9. Same, from above. 



Fig. 10. Right side of trunk, with gills in their natural position. 



