234 CRUSTACEA MALACOSTRACA. Ill 



Fig. 4f. First left thoracic leg of a female; x 17. 



— 4 g. Distal portion of the leg shown in fig. 4 f ; x 52. 



— 4I1. Distal part of the median lamella of the operculum iii a male, from below; x 25. 



Fig. 5. Ianira laciniata G. O. Sars. 

 Fig. 5 a. Right part of all thoracic segments of a female without marsupium from the "Ingolf" Stat. 

 32, from above; x 20 / 3 . ep. epimera, five in all, processes from the first joint of the thoracic legs. 



Fig. 6. Acanthaspidea typldops G. O. Sars. 



Fig. 6 a. Left maxilliped of a female from Lat. 6i°i5' N., Long. 9°35' W., 463—515 fath., from below; 

 x 40. 



— 6 b. Right part of sixth and seventh thoracic segments of the largest specimen, a male 8-4 mm. 



long, from above; x x 9/ 2 . ep. epimera, processes from the basal joint of the legs. 



— 6 c. Distal part of sixth left thoracic leg of the same large male, from behind ; x 34. 



— 6d. Median lamella of the operculum in the same large male, from below; x 18. 



— 6 e. Distal part of the pleopods shown in fig. 6 d, from below ; x 35. 



Fig. 7. Ianirella spongicola n. sp. 

 Fig. 7 a. Major left anterior part of the head with the two proximal joints of left antennula of a fe- 

 male without marsupium, from above; x 25. 



— 7 b. Major part of third thoracic segment of the same female, from above; x 23. 



— 7 c. Abdomen with the lateral parts of seventh thoracic segment of a male, from above; x 16. 



Fig. 8. Ianirella la'vis n. sp. 



Fig. 8 a. Female — 4 mm. long — from the "Ingolf Stat. 24, from above; x 13. Legs omitted. 



8 b. Median frontal part of the head with left antennula of the same female, from above; x 35. 



— 8 c. Left mandible of a female from the "Ingolf Stat. 36, from below ; x 59. 

 8 d. Left maxilliped of the last-named female, from below; x 39. 



— 8e. First left thoracic leg of the last-named specimen, from behind; x 44. 



— 81 Second left thoracic leg of the last-named specimen, from behind; x 44. 



Fig. 9. Katianira chelifera n. gen., n. sp. 

 Fig. 9 a. Left mandible, from below ; x 100. 



— 9b. Distal part of the same mandible, from below; x 200. 



— 9 c. Left maxilliped, from below; x 100. 



— 9d. Left lateral plate of the male operculum, from below; x 90. 



Plate II. 



Fig. 1. Katianira chelifera n. gen., n. sp. (continued). 

 Fig. 1 a. Male, from above; x 26. Legs omitted and uropods lost. 



1 b. Left lateral part of second and third thoracic segments, from above; x 53. 



