xxvi LIST OF ILLUSTRATIONS 



rift. 



424. Shrimp and Prawn . 538 



425. Scyllarus arctus 539 



426. Pagurus bernhardus 539 



427. Cancer pagurus . 540 



428. Typical Brachyura . 541 



429. Squilla . . 542 



430. Diastylis stygia . . 543 



431. Gammarus neglectus 544 



432. Asellus aquaticus . 545 



433. Various Amphipoda . 546 



434. ,, Isopoda . 546 



435. Orchestia cavimana, anatomy 548 



436. Euphausia pellucida . 549 



437. Nervous system of Crab . . 550 



438. Cypris-stage of Lepas . 552 



439. Larvre of Crabs ..... . 554 



440. Diagram illustrating the mutual relationships of the orders of 



Crustacea . .... 557 



441. Dalmanites and Phacops . . 558 

 441-6 is. Triarthrus beckii . . . 559 



442. Peripatus capeiisis .... . 560 



443. ,, ,, ventral view of head . 560 



444. ,, anatomy . 561 



445. ,, edwardsii, nephridium . . - 563 



446. ., novaezealandiae, development . 564 



447. ,, capensis ,, . 565 



448. Scolopendrella immaculata . . 567 



449. Scolopendra . . . 568 



450. Lithobius forficatus . 568 



451. Pauropus huxleyi . . . 569 



452. Strongylostoma, development - 570 



453. Periplaneta americana . 572 



454. ., mouth-parts . 573 



455. ,, americana, lateral view of head . . 573 



456. ,, muscular system . . .5/5 



457. ,, anatomy . 576 



458. ,, salivary glands . . . 577 



459. Trachea of caterpillar 577 



460. Periplaneta, tracheal system . . 578 



461. ,, nervous system . . 578 



462. ,, male reproductive organs . . . 579 



463. ,, female reproductive organs . . 579 



464. Segmentation of ovum of Insect .... . 580 



465. Ventral plate of embryo Cockroach . 581 



466. Germinal layers and amnion of Insect . . 582 



467. Lepisma . . . 582 



468. Podura . . 584 



469. Locusta . . 584 



470. Ephemera . . 584 



