LIST OF ILLUSTRATIONS xxvii 



FKi. 1'ACIE 



471. Aphis rospti 585 



472. Cicada ... ..... . 585 



473. Pulex and larva . 586 



474. Gastrophilus equi .... 58(3 



475. Pieris .... . .586 



476. Crioceris ... 587 



477. Section of integument of Insect . 588 



478. Mouth-parts of Honey-bee 589 



479. ,, ,, Diptera . . . 590 



480. ,, ,, Lepidoptera . 591 



481. Digestive organs of Beetle 592 



482. Nervous, tracheal, and digestive systems of the Honey-bee . . 593 



483. Tracheal gills of Ephemerid .... . 594 



484. Heart of Cockchafer . . .... . 594 



485. Nervous system of Diptera 595 



486. Ocellus of Dytiscus larva . . 596 



487. Chordotonal organ of Isopteryx .... . . 597 



488. Sexual apparatus of Honey-bee . 598 



489. Segmentation of ovum of Insect 599 



490. Germinal layers and amnion of Insect . . . . 600 



491. Development of Hydrophilus 601 



492. . . .601 



493. Apis mellitica, queen, worker, and drone 603 



494. Formica rufa . 603 



495. Euscorpio . . ... 605 



496. Ventral surface of cephalothorax and pr;e-abdomen of Scorpion . 605 



497. Endosternite of Scorpion ... ... 60(5 



498. Scorpion, anatomy, lateral view . . 608 



499. ,, ,, dorsal ,, . . . 609 



500. ,, development . . . 610 



501. Embryo of Scorpion . . 610 



502. Chelifer bravaisii . 613 



503. Phrynus . . 613 



504. Galeodes dastuguei . . .... 614 



505. Epeira diadema ... . 615 



506. ,, ,, chelicene and pedipalpi of female .... 615 



507. ,, ,, -. male 615 



508. Sarcoptes scabirei . . . 616 



509. Trombidium fuliginosum ... . . 616 



510. Limulus .... 617 



511. ,, ventral view . 618 



512. Eurypterus fischeri .... 619 



513. Anatomy of dipneumonous Spider . 620 



514. Limulus, sagittal section .... . .621 



515. Lung-book of Spider ... . . 621 



516. Tracheal system of Spider . . 621 



517. Gill-books of Limulus . <>i"J 



518. Lateral eye of Euscorpius 622 



519. Central . 623 



