XLVI ILLUSTRATIONS. 



Page. 



FIG. 578. Stegophryxus hyptius (After Thompson), a, Hermit crab with 

 parasite attached, b, Anterior portion of head of female (ventral 

 side), c, Dorsal view of adult female, d, Ventral view of same. 

 f, Left maxilliped of adult female. /, Head of adult female (dor- 

 sal view), g, Head of adult female (ventral side). /<, Abdomen 

 and posterior part of thorax of adult female ( ventral view ) 533 



579. Stegophryxus hyptius (After Thompson), a, Dorsal view of adult 

 male, b, Ventral .side of head of same, c, Ventral view of head 

 of cryptoniscid. d, Cryptoniscid from young female (lateral 

 view), e, Pleopod of third abdominal segment of cryptoniscid. /, 

 Musculature of one of first four pereiopoda (adult female), g, 

 Musculature of one of sixth or seventh pereiopoda of female, h, 

 Musculature of pereiopod. /, Dorsal view of larval female, j, 

 Ventral view of same 534 



580. Stegias clibanarii. a, Dorsal view of female, b, Ventral view of 



female 536 



581. Bath ygyge grandis ( After Hansen). a, Head of male (ventral view). 



b, Dorsal view of male, c. First leg of male, d, Fifth leg of male. 538 



582. Phyllodurus abdominalis. Female (dorsal view) 541 



583. Phyllodurus abdominalis. One of biramous pleopods of adult 



female 541 



584. Phyllodurus abdominalis. a, First incubatory lamella, b, Maxil- 

 liped. c, Seventh leg .~ 542 



585. Phyllodurus abdominalis. a, Male, b, Young female 542 



586. Argeia pugettensis. a, Dorsal view of adult female, b, Ventral 



view of adult female 545 



587. Argeia pugettensis. Male 545 



588. Argeia pugettensis. First lamella of inarsupium 546 



589. Argeia pugettensis. Sixth leg of specimens found on: a, Crago ni- 

 gricauda from off Cape Johnson, Washington, b, Crago communis 

 from Straits of Fuca. c, Nectocrangon crassa from off Cape New- 

 enham, Alaska. d, Nectocrangon crassa from Alaska 546 



590. Argeia pugettensis. Sixth leg of specimens found on: a, Necto- 

 crangon dentata from Afognak Bay, Afognak Island, b, Nec- 

 tocrangon crassa from Cape Nevvenham, Alaska 547 



591. Argeia pugettensis Seventh leg of specimens found on: a, Necto- 

 crangon alascensis from southwest of Sannakh islands, Alaska. 

 6, Crago nigromaculata from San Diego Bay, California, c, Crago 

 dalli from south of Amak Island, Alaska. (/, Crago communis 

 from Akutan Island, Bering Strait 547 



592. Argeia pugettensis. First incubatory plate from specimens found on: 

 '/. Nectocrangon crassa from off Cape Newenham, Alaska, b, Nec- 

 tocrangon crassa from Alaska, c, Crago nigromaculata from San 

 Diego Bay, California, d, Crago nigricauda from off Cape Johnson 548 



593. Argeia pugettensis. First incubatory lamella from specimens found 

 on: a, Crago communis from Straits of Fuca. b, Crago communis 

 from Akutan Island, Alaska, c, Nectocrangon alascensis from 

 southwest of Sannakh Islands, Alaska, d, Crago dalli from south 

 of Amak Island r 548 



594. Argeia pugettensis. First incubatory lamella from specimens found 

 on: a, Nectocrangon dentata from Afognak Bay, Afognak Island. 

 b, Nectocrangon crassa from off Cape Newenham, Alaska 549 



595. Argeia pugettensis. a, Dorsal view of immature female, b, Ventral 



view of same. (First post-larval stage) 549 



