CRUSTACEA MALACOSTRACA. III. 



243 



Fig. 5. Pseiidomesus brevicornis 11. gen., 11. sp. 



Fig. 5 a. Adult female, from the right side; x 21. Marsuphun omitted and the antenna lost excepting 

 its short proximal joints. 



— 5 b. Body of another adult female, from above; x 16. 



— 5 c. Right antennula, from the outer side; x 68. 



— 5 d. Both .mandibles, from below; x 68. 



— 5 e. Left maxilliped, from below ; x 68. 



— 5 f. First right leg, from the outer side; x 48. a. the two distal spines of fifth joint and the 



margin between them, more highly magnified. 



— 5 g. Abdomen and posterior part of last thoracic segment of the female shown in fig. 5 b, from 



below; x 32. 



Fig. 6. Macrostylis spinifcra G. O. Sars. 

 Fig. 6 a. Abdomen and the posterior part of last thoracic segment of a male from Skager Rak ("Hauch" 

 Stat. 460), from below ; x 52. 



— 6 b. Abdomen and the posterior part of last thoracic segment of a female from the same Danish 



locality, from below; x 52. 



— 6 c. Left postero-lateral subdiaphanous portion of the abdomen of a female, seen from above and 



exhibiting the peculiar statocyst consisting of an internal cavity containing a lump of minute 

 crystals; about x 150. 



Plate VII. 



Fig. 1. Macrostylis spiiiifera G. O. Sars (continued). 

 Fig. 1 a. Head with antennuke and the right antenna of a female from the "Ingolf" Stat. 80, from 

 above; x 42. 



— ib. Leg of third pair of the same specimen; x 54. 



— 1 c. Posterior part of the body with sixth right leg and left uropod of the same specimen, from 



above; x 30. 



Fig. 2. Macrostylis abyssicola n. sp. 

 Fig. 2 a. Female from the "Ingolf" Stat. 37, from above; x 15. 



— 2 b. Left margin of the head with antennula and antenna of a female from the "Ingolf" Stat. 37, 



from above; x 57. s. sensory filament. 



— 2 c. Male from the "Ingolf" Stat. 22, from above; x 15. 



— 2d. Left margin of the head with antennula and antenna of the last-named male, from above; 



x 57. s. sensory filaments. 



— 2 e. Third left leg of a female; x 45. 



— 2 f. Sixth left leg of a female, from in front; x 45. 



— 2 g. Abdomen and the two posterior segments of a female from the "Ingolf Stat. 38, from 



below; x 27. 



— 2 h. Abdomen and the two posterior thoracic segments of a male from the "Ingolf Stat. 22, from 



below; x 35. 



31* 



