CRUSTACEA MALACOSTRACA. III. 251 



Fig. 5 c Second left thoracic leg of the same female, from behind; x 37. 



— 5L Seventh right thoracic leg of the same female, from in front; x 37. 



— 5g. Posterior part of abdomen with uropods of a female, from below; x 37. 



Fig. 6. Desmosonia plebejum n. sp. 



Fig. 6 a. Female with marsupium, from above; x 33. 



— 6b. First right thoracic leg of a female, from behind; x 80. 



— 6 c. Major part of seventh right thoracic leg of the same female, from in front; x 78. 



— 6 d. End of abdomen with uropods of a female, from below ; x 78. 



Fig. 7. Ilyarachna hirticcps G. O. Sars. 

 Fig. 7 a. Proximal parts of antennulae and of right antenna of a female with marsupium from Lat. 

 63°i5'N., Long. 22°23' W., from above; x 23. sq. squama (exopod). 



Fig. 8. Ilyarachna bicornis n. sp. 

 Fig. 8 a. Anterior major part of the body of a female without marsupium, from above; x ^/ 2 . 



— 8 b. Right antennula and proximal part of right antenna of the same specimen, from above; x 25. 



— 8c. Distal major part of seventh right leg, from behind; x 35/ 2 . 



Fig. 9. Ilyarachna dubia n. sp. 

 Fig. 9 a. Body of an immature female, 3-8 mm. long, from above ; x 2 5/ 2 - 



— 9b. Anteunuke and proximal part of right antenna of the same specimen from above; x 34. 



— 9c. Distal major part of seventh left leg, from in front; x 24. 



Fig. 10. Ilyarachna spinosissima 11. sp. 



Fig. 10 a. Male, from above; scarcely x 14. 



— 10 b. Proximal parts of left antennula and antenna of the same male, from above; x 28. 



— 10 c. Distal part of left mandible, from below ; x 39. 



— 10 d. Distal major part of second left leg, from behind; scarcely x 15. 



— 10 e. Fifth left leg, from in front; scarcely x 15. 



Plate XII. 



Fig. 1. Ilyarachna spinosissima n. sp. (continued). 



Fig. 1 a. Left maxilliped, from below ; x 34. 



— 1 b. Abdomen and the two posterior thoracic segments of the male shown on the preceding plate, 



from above; x 21. 



— 1 c. Left uropod of a female, from below; x 53. 



Fig. 2. Echinozonc arctica n. sp. 



Fig. 2 a. Male, from above; x 21. 



— 2 b. Antennulse and proximal part of right antenna, from above; x 85. 



— 2 c. Left uropod, from below; x 132. ex. exopod. 



3** 



