no. 2065. THE CRUSTACEA EUPHAUSIACE A— HANSEN. 113 



EXPLANATION OF PLATES. 



Plate 1. 



Thysanopoda cornuta Illig. 



Fig. la. Carapace (with the proximal part of left eye-stalk) of a large female, from the 



leftside; Xf- 



Euphausia pacifica H. J. Hansen. 



Fig. 2a. Anterior part of an adult female (from station 4757), from above; X9. 



26. Distal part of first antennular joint and proximal part of second joint of the 



same female, from above; X22. 

 2c. Major part of left antennular peduncle of an adult male, from the left side; 



X17. 

 2c?. Major part of left antennular peduncle of an adult female, from the left side; 



X17. 

 2c. Left copulatory organ of first pleopod of an adult male, unrolled and seen 



from behind; X33. li, inner lobe; Im, median lobe; Is, setiferouslobe; lu, 



auxiliary lobe. 

 2/. Inner and median (Im) lobes of the organ shown in fig. 2e, from behind; X51. 



p 2 , terminal process; /, its foot; h, its heel; p 3 , proximal process; p 4 , lateral 



process. 

 2a. Inner and median lobes of left copulatory organ of another male, from the 



inner side; X51. The lettering as in fig. 2/. 



Thysanoessa longipes Brandt. 

 Fig. 3a. Major part of left antennular peduncle of an adult female (from station 5030), 

 from the outer side; X12. 

 36. Major part of left antennular peduncle of an adult male (from station 5030), 



from the outer side; X12. 

 3c. Distal part of the endopod of left maxilliped of a female, from below; X33. 

 So*. Right sixth thoracic leg, branchia omitted, of a female, from behind; X12. 



Plate 2. 



Thysanoessa longipes Brandt. (Continued.) 

 Fig. la. Anterior part of body with appendages of a scarcely adult female, from the 



leftside; XV- 

 16. Anterior part of a female, from above; X7. 

 lc. The six abdominal segments — pleopods omitted — and the base of the caudal 



fan of a female from station 4793, from the left side; X scarcely 6. 

 Id. Left copulatory organ of first pleopod of an adult male, unrolled and seen 



from behind; X32. ?i, inner lobe; Im, median lobe; Is, setiferouslobe; lu, 



auxiliary lobe, 

 lc. Inner and median lobes of the organ shown in fig. lc?, from behind; X50. 



p l , epiniform process; p 2 , terminal process; p z , proximal process; p*, 



lateral process. 



Thysanoessa inermis Kr0yer. 

 Fig. 2a. Major part of the two anterior right thoracic legs of an adult male, 17 mm. 



long (from Woods Hole region), from the outer side; X16. 

 26. Major part of the two anterior left thoracic legs of an adult male, 16.5 mm. 



long (from Woods Hole region), from the outer side; X16. 

 2c. Sixth and seventh joints of left first thoracic leg of a large female, 22.5 mm. 



long (from Woods Hole region), from the outer side; X16. 

 2c?. First left thoracic leg of an adult female, 19 mm. long (from Woods Hole 



region), from the outer side; X16. 



59758°— Proc.N.M.vol.48— 14 8 



