PLATE 4. 
Fig. 1. Thysanopoda cristata G. O. Sars. 
Fig. la. Left antennular peduncle of the adult male, from the outer side; X 8. 
Fig. 1b. Right antennular peduncle of the adult male, from above; X 8. 
Fig. le. Left antennular peduncle of the young specimen from Sta. 4699, from the left sic 
Fig. 1d. Left maxillula of the immature specimen from Sta. 4736, from below; X 31. 
Fig. le. Male copulatory organ of left first pleopod, unrolled and seen from bel 
inner lobe; Im. median lobe; ls. setiferous lobe — the setae along both margins omitte 
lobe; p'. spine-shaped process; p?. terminal process; p*. proximal process; p‘. lateral 
Fig. 1f. Terminal process of the organ shown in fig. le, from behind; X 45. 
Fig. 1g. Terminal process of the organ shown in fig. le, from the inner side; 
Fig. lh. Distal part of the median lobe of the organ shown in fig. le, seen fron 
hibiting the lateral process and the additional process; X 45. 
Fig. 2. Thysanopoda tricuspidata H. Mitne Epwarps. 
_ Fig. 2a. Left maxillula of an adult specimen, from below; X 32. 1. first joint; I. 
joint; 2.second joint; 3. third joint; . lobe from third joint; 4. fourth joint or palp; px 
Fig. 3. Thysanopoda monacantha OrtTMANN. i 
Pe! | 
Fig. 3a. Left maxillula of a probably immature male, from below; X 34. The 
fig. 2a. ; ; 
Fig. 3b. Inner and median lobes of left copulatory organ of a probably immature n 
X85. The median lobe has the lateral process and only one additional process. re 
Fig. 3c. Inner and median lobes of left copulatory organ of another probably imm: 
from behind; X 85. p*. lateral process; p*. three additional processes. 
Fig. 4. Thysanopoda aequalis H. J. Hansen. 
Fig. 4a. Left maxillula of an adult female, from behind; X 35. 
Fig. 5. Thysanopoda obtusifrons G. O. Sars. 
Fig. 5a. Anterior part of the body of a female, from above; X15. The setae on 
omitted. 
Fig. 5b. Anterior part of a female, from the left side; X 14. 
Fig. 5c. Left maxillula of an adult male, from below; X 30. 
Fig. 5d. Left copulatory organ, unrolled and seen from behind; X 48. p* lateral 
additional process. 
Fig. 5e. Inner and median lobes of left copulatory organ, from the inner side; 
shaped process; p?. terminal process; p*. proximal process; p‘. lateral process; p*. add 
Ju. margin of the auxiliary lobe with its minute coupling hooks. 
Fig. 5f. Distal part of the proximal process of the organ shown in fig. 5e, from the inn 
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