680 



INVERTEBRATA 



Lateral plates, formation of, in Amphiura 



squaniata, 499 

 Lateral sinus, formation of, in Peripatus 



capensis, 174 



Lecithin, ingredient of food-yolk, 3 

 Leda, 349 

 Left anterior coelom of larva of Asterias, 



466 ; of larva of Echinus esculentus, 509 ; 



of larva of Ophiothrix fragilis, 490 

 Left posterior coelom of embryo of A ntedon 

 rosacea, 547 ; of larva of Asterias, 466, 



468 ; of Echinus esculentus, 509, 514, 



515 ; of larva of Ophiothrix fragilis, 490, 



494 

 Legs, formation of, in Julus and Scolopendra, 



284 



Legs of Donacia, jointing of, 252 

 Lens, formation of, in compound eye of 



Astacus, 189 ; in eye of Cephalopoda, 



366, 367 ; in ocelle of Dytiscus, 274 ; in 



compound eye of Dytiscus, 276 

 Lepas, embryonic development of, 195 

 Lepidoptera, 245, 266, 272, 278, 286, 288 

 Lepidosiren, maturation of male cells of, 4 

 Lepvsma, development of, 263, 264, 266, 



282, 286 



Lepralia, corona of larva of, 395 

 Leptinotarsa decemlineata, development of, 



245, 246, 247 



Leptogorgia virgulata, development of, 87 

 Leptonema, definition of, 4 

 Leptostraca, 177 



Leptotene thread, definition of, 4 

 Leuconidae, 37 



Leucosolenia, 43 ; in development of, 47 

 Limnaea, 323 

 Limulus, 221, 241, 244, 282 ; development 



of 236-239 

 Lingula, 414 

 Lip-cavities, formation of, in Amphioxus 



lanceolatus, 606 



Liriope, experiments of eggs of, 96, 97 

 Lithium larva of Echinoidea, 526, 527, 528 

 Liver, formation of, in Agelena, 235 ; in 



Astacus, 190 ; in Dreissensia, 337 ; in 



Loligo, 364 ; in Paludina, 315 

 Lobata, 53 



Loligo, development of, 356-366 

 Loligo vulgaris, 353 

 Longitudinal ciliated band of larva of 



Asterias, 463 ; of larva of Balanoglossus 



clavigerus, 574 ; of larva of Echinoidea, 



464 ; of larva of Echinus esculentus, 508 ; 



of larva of Ophiothrix fragilis, 487 ; of 



larva of Synapta digitata, formation of, 



532 

 Longitudinal muscles, formation of, in 



Amphioxus lanceolatus, 594 ; in Oriodrilus 



lacium, 158 ; in larva of Cynthia partita, 



615 ; in Polygordius appendiculatus, 147 

 Lopadorhynchus, 1 

 Lophophore of Brachiopoda, 407 

 Lophophore of Terebratulina septentrional is, 



development of, 413 



Loricata, 177 



Loricata, larval history of, 214 



Lower layer cells, formation of, in segment- 

 ing egg of Sepia, 356 



Lower sclerotomes, formation of, in Amphi- 

 oxus lanceolatus, 599 



Loxosoma, 398 



Lucifer, 177, 192, 203 



Luidia, 457 



Lumbricus, 157 



Lung-books, formation of, in Scorpion, 241 



Lung-sac, formation of, in Agelena, 231 ; in 

 Scorpion, 241 



Lycosa, 221 



Lysin, 17 



Machilis, 284, 286, 287 ; development of, 

 265, 266 



Macrobiotus macronyx, development of, 243 



Macromeres in segmenting egg of A mphioxus 

 lanceolatus, 588 ; in segmenting egg of 

 Bero'e, 90 ; in segmenting egg of Dentalium, 

 327 ; in segmenting egg of Dreissensia, 

 333 ; in segmenting egg of Echinus escu- 

 lentus, 506 ; in segmenting egg of Patella, 

 293 ; in segmenting egg of Phascolosoma, 

 373 ; in segmenting egg of Planocera, 

 104 



Macro-segments of Donacia, 251 



Macrura, 177, 208, 210 



Madreporic pore, formation of, in larva of 

 Antedon rosacea, 547 ; in larva of Asterias, 

 465 ; in larva of Echinus esculentus, 508 ; 

 in larva of Ophiothrix fragilis, 489 ; in 

 larva of Synapta digitata, 531 



Madreporic vesicle, formation of, in Asterias, 

 467; in Aster ina gibbosa, 467, 474; in Crib- 

 rella oculata, 481 ; in Echinus esculentus, 

 511 ; in Ophiothrix fragilis, 492 ; in 

 Solaster endeca, 481 



Malacostraca, 177, 655 



Male, definition of, 2 



Male-cells of Ascaris megalocephala, 439 



Male pronucleus, definition of, 9 



Malpighian tubes, formation of, in Agelena, 

 230 ; in Donacia, 260 ; in Scorpion, 240 ; 

 metamorphosis of, in larva of Galerucella 

 ulmi, 270 



Mammalia, 657 



Man, young of, 19 



Manchette, 7. (See Ruffle. ) 



Mandibles, formation of, in Astacus, 184 ; in 

 Cyclops, 199 



Mandibular cavities of Vertebrata, 606 



Mandibular segment in Donacia, 252 



Mantle, formation of, in simple Ascidian, 

 622 ; in embryo of Membranipora, 389 ; 

 in Pedicellina echinata, 403 ; in adult 

 Unio, 352 



Mantle-cavity, formation of, in Dreissensia, 

 339 ; in Loligo, 357 ; in Patella, 300 



Mantle-fold, formation of, in Dentalium, 

 329 ; in Paludina, 315 ; in Patella, 300; 

 in Terebratulina septentrionalis, 410 



