114 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.48. 



Plate 3. 



Thysanoessa spinifera Holmes. 



Fig. la. Anterior part of the body with appendages of an adult male (from station 



4758), from the left side; X6. 

 16. Anterior part of the body of an adult female (from Barclay Sound), from 



above; XV 5 - 

 lc. Major part of left antennular peduncle of a female, from the outer side; X12. 

 Id. Major part of left antennular peduncle of the male shown in fig. la, from the 



outer side; X12. 

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

 1/. Major part of the two anterior left thoracic legs of the adult male shown in 



fig. la, from the outer side; XH- trl 1 , first leg; trl 2 , second leg. 

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



fan of a female (from station 4367), from the left "ide; Xscarcely 6. 

 lh. Left copulatory organ of first pleopod of a perhaps not fully adult male, 



unrolled and seen from behind; X36. 

 li. Inner and median (Im) lobes of the organ shown in fig. 1ft, from behind; 



X80. p 1 , spiniform process; p 2 , terminal process; p 3 , proximal process; p*, 



lateral process. 

 lh. The more important part of left copulatory organ of a large and adult male, 



from behind; X61. Im, median lobe; Is, setiferous lobe; lu, auxiliary 



lobe; the other letters as in fig. li. 



Plate 4. 

 Tessarabrachion oculatum H. J. Hansen. 



Fig. la. Anterior part of the body with appendages of a male (from station 4793), 



from the left side ; X 6. 

 16. Anterior part of a female (from station 4793), from above; X7. 

 lc. Left antennula, excepting the proximal part of first joint of a female, from 



the outer side; X10. 

 Id. Left antennula excepting the proximal part of first joint of a male, from the 



outer side; X10. 

 le. Upper flagellum of left antennula of another male, from above; X-^. 

 1/. Right antenna, from below; X7. 

 la. Left maxillula of a female, from below; X30. 

 lh. Left maxilla of the same female, from below; X30. 1, first joint; 2, second 



joint; 3, third joint; 4, fourth joint, "palp"; ex, exopod. 

 li. Left maxilliped of a male, from below; X9. 



lh. The terminal part of the maxilliped shown in fig. li, from below; X33. 

 11. Right sixth thoracic leg, branchia omitted, of a female, from behind; X14. 

 Im. Left copulatory organ of first pleopod of a perhaps not adult male, unrolled 



and seen from behind; X51. 



