LIST OF ILLUSTRATIONS. XI 



Page. 



Limnoria japonica. Abdomen 95 



Astacilla dilatata 96 



Arcturus granulatus 98 



Arcturus hastiger 100 



Arcturus tritxniatus 102 



Arcturus magnispinis 103 



Arcturus diversispinis 104 



Arcturus brevispinis 105 



Arcturus crassispinis 106 



Pentidotea rotundata 109 



Pendidotea rotundata. Maxilliped 110 



Synidotea acuta Ill 



Synidotea epimerata 112 



Synidotea epimerata. Maxilliped 112 



Synidotea tuberculata 113 



Janira japonica. Head and first five segments of thorax 115 



Janira jajMnica. Last two segments of thorax and abdomen 115 



Microprotus csecus 117 



Microprotus csecus. Second thoracic leg 118 



Microprotus cxcus. First and secpnd pleopods of male 118 



Microprotus csecus. First thoracic leg 118 



Microprotus csecus. Sixth leg 118 



Munnopsis latifrons. Abdomen 119 



Munnopsis latifrons. Seventh leg 119 



Eurycope Isevis 120 



Eurycope Isevis. One of the natatory legs 120 



Prophryxus alascensis. Dorsal view of adult female 124 



Prophryxus alascensis. Ventral view ■ 124 



Isopod parasite. Dorsal view 125 



Isopod parasite. Ventral view 125 



Wings of male Azuma elegans, from Miyazaki, Japan 370 



Wings of male Epophthalmia species, from Burma 371 



Wings of male Macromia tseniolata, Bluffton, Indiana 373 



Wings of male Macromia wabashensis, Bluffton, Indiana 375 



Wings of male Macromia illinoiensis , Waterloo, Iowa 378 



Wings of female Macromia illinoiensis, Sandusky, Ohio 379 



Wings of male Macromia pacifica, Bluffton, Indiana 385 



Ccrithiopsis stephensi 399 



Skeleton and gemmule spicules of Spongilla-like form of Ephydatia crateri/ormis . 403 



Skeleton and gemmule spicules of Tubella pennsylvanica from S. India 404 



Gemmule and spicules of Heteromeyenia plumosa. A, gemmule, showing aper- 

 ture in center; B, short birotulates; C, long birotulates; D, free microscleres ; 



E, skeleton spicule 405 



Polypus hoylei. Third arm of right side 408 



Stephanoteuthis hawaHensis. Lateral aspect 409 



Stoloteuthis iris. Dorsal aspect 411 



Abralia astrosticta. Ventral aspect 412 



Abralia astrosticta. Left ventral arm 412 



Abralia astrosticta. Club of right tentacle 413 



Abralia astrosticta. Inferior surface of right eye and surrounding region, show- 

 ing distribution of luminous organs 418 



Chiroteuthis famelica. Dorsal aspect 414 



Liocranchia globula. Dorsal aspect 415 



