XVI II LIST OF ILLUSTRATIONS. 



P <so. 



Method of giving hexagonal form to base at upset 189 



Metliod of finishing at the border, -with two hoops of rattan 389 



Method of turning strips at the border, polished side out 389 



Method of turning vertical strips at the border, polished side out 389 



Method of finishing at the border 390 



Method of ornamentation 390 



Radials, basals, and infrabasals of Hypalocrinus naresian iis 409 



Jxropsis patagoniensis 421 



Coregonus oregonius 428 



Acanthonisciis spiniger 432 



Acanthoniscus spiniger. Second antenna 432 



Acanthoniscus spiniger. Uropod 433 



Acanthonisciis spiniger. Maxilliped 433 



Acanthoniscus spiniger. Second maxilla 433 



Acanthoniscus spiniger. First maxilla, inner lobe, outer lobe 434 



Acanthoniscus spiniger. Anterior view of head showing epistome with labrum. 434 

 Diagram to show to relative sizes of the three forms in the genus Gymnura as 

 determined by length of hind foot, including claws, and of basal length of 



skull 452 



Outline of ventral surface of Dactylohatus armatus 460 



Diagrammatic tergum of any complete wing-bearing segment, and the base of 



the wing; dorsal view 523 



Diagrammatic tergum of any complete wing-bearing segment; ventral view . . . 524 



Diagrammatic lateral view of any complete wing-bearing segment, external 536 



Diagrammatic view of inner surface of the pleurum of any complete wing-bear- 

 ing segment 537 



Diagram of a generalized wing and its articular sclerities or axillaries 544 



Diagrammatic cross section of a wing-bearing segment 544 



Left humerus of Ptiloclus gracilis 620 



Right radius of Ptilodus gracilis 020 



Terminal phalanx of Ptilodus gracilis 621 



Left half of pelvis of Ptilodus gracilis 621 



Right femur of Ptilodus gracilis 621 



Proximal portions of tibia and fibula of Ptilodus gracilis 621 



Right lower jaw of Trichosurus vulpecula 024 



Right lower jaw of Ptilodus gracilis 624 



Right lower jaw of Plagiaulax brecklesii 625 



Spongilla sccptrioides. Skeleton spicules; gemmule spicules 628 



Spongilla philippincnsis. Fragment of skeleton 029 



Spongilla philippinensis. Skeleton spicules; gemmule spicule 630 



Spongilla dementis. Skeleton spicules; gemmule spicule; fragment of skeleton. 632 



Benthohatis marcida 677 



