LrST OF WOOD-CUT ILLUSTRATIONS. XXV11 



PAGE 



308. Oblique Section of shell of Pinna 595 



309. Section of hinge-tooth of Mya 598 



310. Nacre of Avicula 599 



311. Vertical Section of shell of Unio 600 



312. Internal and external surfaces of Shell of Terebratula . . 601 



313. Vertical Sections of ditto . . .602 



314. Horizontal Section of shell of Terebratula bullata . . . 603 



315. Ditto . ditto of Megerlia lima .... 603 



16. Ditto ditto of Spiriferina rostrata . . . 603 



17. Palate of Helix hortensis 606 



318. Ditto of Zonites cellaring 606 



19. Ditto of Trochus zizyphinus 607 



320. Ditto of Doris tuberculata 608 



321. Ditto of Buccinum, under Polarized light 609 



322. Parasitic Larvae (Glochidium) of Anodon, after Houghton . . 611 



323. Embryonic development of Boris, after Reid .... 612 



324. Embryonic development of Purpura 615 



325. Later stages of the same 616 



326. Structure of Polycelis, after Quatrefages 625 



327. Circulation of Terebella, after Milne-Edwards . . . .627 



328. Actinotrocha branchiata, after Wagener 630 



329. Development of Nemertes from Pilidium, after Krohn . . 631 



330. Ammothea pycnogonoides, after Quatrefages 637 



331. Cyclops quadricornis, after Baird 640 



332. Development of Balanus, after Bate 647 



333. Metamorphoses of Carcinus, after Couch 650 



334. Scale of Morpho Menelaus 656 



335. Battledoor scale of Polyommatus argus, after Quekett . . 657 



336. Scales of Podura plumbea 658 



337. Hairs of Myriapod and Bermestes 659 



338. Head and Eyes of Bee 661 



339. Section of Eye of Melolontha, after Strauss-Durckheim . . 662 



340. Eye of Bee 663 



341. Antenna of Cockchafer 665 



342. Portions of Ditto, more highly magnified .... 666 



343. Tongue of Fly 668 



344. Tongue, &c, of Honey Bee 669 



345. Proboscis of Vanessa 670 



346. Tracheal system of Nepa, after Milne-Edwards .... 674 



347. Trachea of Bytiscus 675 



348. Spiracle of Fly 675 



349. Spiracle of Larva of Cockchafer 676 



350. Foot of Fly, after Hepworth 680 



351. Foot of Bytiscus 681 



352. Eggs of Lisects, after Burmeister 6S4 



353. Foot, with combs, of Spider 688 



354. Ordinary and glutinous threads of Spider 689 



355. Minute structure of Bone, after Wilson 694 



356. Lacunae of ditto, highly magnified, after Mandl .... 695 



357. Section of Bony scale of Lepidosteus 696 



358. Vertical Section of Tooth of Lamna, after Owen . . . .60S 



359. Transverse Ditto of Pristis, ditto . . . .698 



360. Ditto Ditto of Myliobates 699 



361. Vertical Section of Human Tooth, after Mandl . . . .700 



