EXPLANATION OF PLATES 



PLATE 1 



Fig. 1. Ncmatoscelis difficilis Hansen, male, anterior part of head, and right 

 eye, from side, showing long rostrum. X 10. 



. Fig. 2. Eupliausia gibba Sars, female, anterior part of head, eyes, peduncle 

 of left antennule, from side. X 10. 



Fig. 3. Nematoscelis diificilis Hansen, female, anterior part of head, right 

 eye, from side. X 10. 



Fig. 4. Nematoscelis difficilis Hansen female, anterior part of head, eyes, 

 from above. X 10. 



Fig. 5. Thysanoessa gregaria Sars, male, anterior part of head, left eye, 

 from right side. X 10. 



Fig. 6. Nyctiphanes simijlex Hansen, male, anterior part of head, left eye, 

 base of left antennule, from left side. X 20. 



Fig. 7. Pseudomma sp., female, anterior part of head, eyes, base of an- 

 tennule and of antenna with scale, from above. X 20. 



Fig. 8. Nyctiphanes simplex Hansen, female, anterior part of head, eyes, 

 antenuular peduncles, from above. X 10. 



Fig. 9. Euphausia pacifica Hansen, female, anterior part of head, left eye, 

 from right side. X 20. 



Fig. 10. Nyctiphanes simplex Hansen, male, anterior part of head, eyes, 

 peduncles of antennules from above. X 10. 



Fig. 11. Holmesiella anomala Ortmann, male, anterior part of head, left 

 eye, peduncle of antennule and of antenna with scale, from side. X 10. 



Fig. 12. Nematoscelis difficilis Hansen, male, outline of fore part of head 

 to show short rostrum, left eye, from above. X 10. 



Fig. 13. Nyctiphanes simplex Hansen, female, anterior part of head, left 

 eye, base of left antennule, from left side. X 20. 



Fig. 14. Euphausia pacifica Hansen, female, head and anterior part of 

 thorax, eyes, from above. X 10. 



Fig. 15. Nematoscelis difficilis Hansen, male, outline of fore part of head, 

 and of eyes, from side. X 10. Cf. fig. 12. 



Fig. 16. Thysanoessa gregaria Sars, male, fore part of head, left eye, from 

 above. X 10. 



Fig. 17. Holmesiella anomala Ortmann, male, fore part of head, eyes, base 

 of antennule, antennal scale, from above. X 10. 



[18] 



