XXX LIST OF ILLUSTRATIONS 



Flo. MGE 



609. Aphis roscB . . 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. „ ,, Dipteia . 638 



518. „ „ Lepidopteia 639 



519. Digestivf organs of Beetle . 641 



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



521. Tracheal 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 . 660 



530. ,, „ . . . 650 



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



532. Formica rufa 652 



533. Buscorpio . . 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. ,, ,, chelicera; and jjedipalpi of female 664 

 •"i45- ,, ,, ,, ,, male 664 

 546. Sarcoptes scabiaii . 665 

 .547. Trombidium fuliginosum . . 666 

 .548. Limulus . . 666 

 549. ,, ventral view . . 667 

 560. Eurypterus fischeri ... . 668 



551. Anatomy of dipneunionous Spider 669 



552. Limulus, sagittal section 670 



553. Lung-book of spider . 670 

 564. Tracheal system of Spider . . 670 



555. Gill-books of Limulus . 671 



556. Lateral eye of Euscorpius . . . 671 

 567. Central eye of Euscorpius .... , , . 672 



