PLATE 5. 



Fig. 1. Thysanopoda pectinata Ortmann. 



Fig. la. Ank'riorpartofafcmalefroniSta. 4719, from above; X 13. The setae on right antennula 

 omitted. , 



Fig. lb. Anterior part of a female from Sta. 4705, from the left side; X 12. 



Fig. Ic. Front end of the carapace of a male from Sta. 4705, from above; X 12. 



Fig. Id. Left maxillula of a male, from below; X 24. 4. fourth joint or palp, very small and seen 

 through the large pseudexopod. 



Fig. le. Left copulatory organ, unrolled and seen from behind; X 34. p'. spine-shaped process; 

 p-. terminal i)rocess; p''. proximal process; p'. lateral process; p^ additional process; pi^. secondary 

 additional process. 



Fig. If. Distal part of the inner and median lobes of left copulatory organ, seen from the inner 

 side and sliowing all processes excepting the secondary additional process; X 48. 



Fig. Ig. Distal part of the proximal process, seen from the outer side; X 50. 



Fig. Ih. The additional process, seen from in front; X 90. 



Fig. li. Inner lobe with its three processes of left copulatory organ of a small male from Sta. 4705, 

 from behind; X 68. 



Fig. Ik. Anterior part of a young specimen, 11 mm. long, from Sta. 4730, from above; X 23. 

 Setae omitted. 



Fig. II. Anterior jiart of the young specimen shown in the preceding figure and seen from the 

 right; X 14. 



Fig. Im. Right antenmda of the same young specimen, from the right side; X 25. 



Fig. 2. Thysanopoda orientalis H. J. Hansen. 



p'ig. 2a. Left maxillula of an atlult male, from below; X 32. The palp is seen through the large 

 pseudexopod. 



Fig. 2b. Outline of left maxillula of another male, from below; X 20. The figure is given for 

 com]iarison with fig. 2a in order to show difference in the palp. 



Fig. 2c. Left maxilla of an adult male, from below; X 20. 1. first joint; 2. second joint; V-. lobe 

 from second joint; 3. third joint; 1'. lobe of third joint; ex. exopod. 



Fig. 2d. Left copulatory organ, unrolled and seen from behind; X 33. p'. lateral process; p*. 

 additional [irocess; p'. secondary additional process. 



Fig. 2e. Terminal process of the same organ, from in front; X 53. 



Fig. 2f. Distal part of the proximal process of the same organ, from behind; X 86. 



Fig. 2g. Distal part of the proximal process of the same organ, from in front; X 127. 



Fig. 2h. Distal part of the proximal process of left organ of another specimen, from behind; X 86. 



Fig. 2i. Distal half of the median lobe of the organ shown in fig. 2d, seen from the inner side; X 50. 

 The lettering as in fig. 2d. 



