xxx LIST OF ILLUSTRATIONS 



FIG. PAGE 



509. Aphis rosre . 633 



510. Cicada 634 



511. Culex and larva 634 



512. Gastrophilus equi . 634 



513. Pieris 635 



514. Crioceris ' . . . 635 



515. Section of integument of Insect . . 636 



516. Mouth-parts of Honey-bee 637 



517. ,, • ,, Diptera . . . 638 



518. ,, ,, Lepidoptera 639 



519. Digestive organs of Beetle 641 



520. Nervous, tracheal, and digestive systems of the Honey-bee . 642 



521. Trachea] gills of Ephemerid . . . 643 



522. Heart of Cockchafer 643 



523. Nervous system of Diptera 644 



524. Ocellus of Dytiscus larva 645 



525. Chordotonal organ of Isopteryx 645 



526. Sexual apparatus of Honey-bee 646 



527. Segmentation of ovum of Insect . 648 



528. Germinal layers and amnion of Insect 649 



529. Development of Hydrophilus 650 



530. „ „ 650 



531. Apis mellifica, queen, worker, and drone 652 



532. Formica rufa .652 



533. Euscorpio 654 ' 



534. Ventral surface of cephalothorax and pre-abdomen of Scorpion . 654 



535. Endosternite of Scorpion 655 



536. Scorpion, anatomy, lateral view 657 



537. ,, ,, dorsal ,, . 658 



538. ,, development 659 



539. Embryo of Scorpion 659 



540. Chelifer bravaisii 662 



541. Phrynus 663 



542. Galeodes dastuguei 663 



543. Epeira diadema 664 



544. ,, ,, chelicerse and pedipalpi of female .... 664 



545. ,, ,, ,, ,, male . . . . . 664 



546. Sarcoptes scabiaei 665 



547. Trombidinm fuliginosum 665 



548. Limulus 666 



549. ,, ventral view 667 



550. Eurypterus fischeri ... 668 



551. Anatomy of dipneumonous Spider 669 



552. Limulus, sagittal section 670 



553. Lung-book of spider . . 670 



554. Tracheal system of Spider 670 



555. Gill-books of Limulus • . . 671 



556. Lateral eye of Euscorpio 671 



557. Central eye of Euscorpio 672 



