INDEX 



681 



Mantle-groove, formation of, in Palttdinn, 



314 



Mantle-layer, definition of, 63 

 Manubrium of medusa of 1'odocoryue, 61 ; 



of Tubitlaria, 58 

 Mastax, formation of, in Callidina russen/'i, 



424 

 Maturation, divisions of germ-cells, 3 ; of 



egg, in Crepidula, 7, 8 ; of spermatozoon, 



in Lepidosiren, 4-6 

 Maxillipedes, development of, in larva of A ch- 



theres amblojrtitis, 207 ; in Astaciis, 186 ; 



in Mysis larva- of Crangonidae, 215 ; in 



Cyclops, 197 

 Mayer's fixative, 35 

 Median dorsal arm of ciliated baud of larva 



of Asterias, 464 

 Median retractor muscle of larva of Dreis- 



sensia, formation of, 341 

 Median ventral arm of ciliated band of larva 



of Aster ins, 464 

 Medullary folds, formation of, in i j mbryo of 



< 'inithia jiartita, 619 

 Medullary plate, formation of, in embryo of 



^Imp/tiiixus lanceolatiis, 591 

 Medusa-buds (see Gonophore) of Siphono- 



phora, 66; of Tubularia, development of, 57 

 Medusae, free, development of eggs of, 59- 



61 



Medusome theory of Haeckel, 66 

 Megalopa larva of Brachyura, 216 

 Melicertidea, 418 

 Mi II! tn tcxtndinata, 504, 522 

 Milnlontha, 287 ; abdominal appendages of, 



266 



Membranipora, development of, 387-394 

 Membranipora pilosa, 387 

 Meridional canals, formation of, in Beroe, 94 

 Meroblastic segmentation, detinition of, 26 ; 



in eggs of Arthropoda, 178 ; in eggs of 



Cephalopoda, 178, 353 ; in eggs of Pera- 



carida, 193 ; in eggs of Pyrosoma, 632 ; 



in eggs of Scorpion, 240 ; in eggs of Sepia, 



353 

 Mesectoderm in Annelida, Mollusca, and 



Gephyrea, 401 ; formation of, in Lepas, 



195 ; in Mollusca, 323 ; in Patella, 309 ; 



in Phascolosoma, 376 ; in Planoccra, 111 ; 



in J'nli/r/orilii/x, 135 

 Mesi'iichyme, definition of, 120 ; formation 



of, in embryo of Antedon rosacca, 545 ; 



in larva of Asterias, 461 ; in larva of 



Balanoglossus davigerns, 573 ; in larva of 



Cerebratulus ladeus, 120 ; in larva of Cn- 



cui/iaria planci, 542 ; in larva of Cynthia 



partita, 614 ; of (irantia, 39 ; in larva 



of Holothuria tubidosa, 541 ; in larva 



of Oji/i/iira liivri.ipiiia, 501 ; in larva of 



Pediccllina echinata, 401 ; in embryo of 



Pyrosoma, 635 ; in larva of N//"'V'/" 



d if/i fata, 531 

 Mesendoderm. formation of, in C'/v// !<lnla. 



323 ; in ])i-cixx<-iix!a. 335 : in Fiona, :J23 ; 



in I'ln/xa, 323 ; in Sepia, 356 



Mesellterie stomata of I'rtn-'nni ow .Wen ////.>, 

 SO 



Mesenterial filaments oiUrticina cras.iicornis, 

 81 



Mesentery of Crlif/na <Ta.xxi<-n,-nix. 79 



Mesoderm, formation of, in Agelena, 224 ; 

 in Alcyonidiii ni it/liiihmi, 388 ; in .lm/i/ti- 

 oxus litiii-i'iilatns, 592; in Astacnx, 180; 

 in Beroe, 93 ; in B/at/a, 261 ; in Cri' 

 322 ; in Donacia, 248 ; in 

 335 ; in Enjilianxiii, 192 ; in Fiona, 322 ; 

 in Lfjxis, 195 ; in Linudus, 236 ; in 

 Nephelis, 161 ; iu Oligocliaeta, 156 ; in 

 Pallenc, 243 ; in Paludina, 310 ; in 

 Patella, 295 ; in Pedicelliiw, 399 ; in 

 Pedipalpi, 241; in Phascolosoma, 375; 

 in Phyxa, 322 ; in P/anocera, 108 ; in 

 Polygordius, 143; in Poli/ji/n'mns, 194; 

 in Salpa, 636 ; in Scorpion, 240 



Mesodermal bands, formation of, in A<tfli'na, 

 225 ; in Den fa./i-nni, 329 ; in Lepas, 195 ; 

 in Lepisma, 265 ; in Oligochaeta, 156 ; in 

 Palmlina, 310 ; in Patella, 299 ; in 

 Pedicel Una echinata, 401 ; in Peripatns 

 I'upensis, 171 ; in Polygordius, 138 ; in 

 Poli/gordins appe/ulicidatns, 144 ; in 

 Scolopendra, 283 



Mesogloea of Urticina crassicornis, 79 



Mesomeres in egg of Ecln'iu/.t rsridt.'i/fti.i, 506 



Mesonemertini, 118 



Mesotrochal larva, definition of, 153 



Metamorphosis of Copepod id larva of .-1 chfheres 

 amblnjilitin, 207, 208 ; of larva of Amji/n'- 

 oxus lanceolatiis, 603, 604 ; of larva of 

 simple Ascidian, 622; of larva of As- 

 terias, 467-472; of the larva of .l^/V/ ///</ 

 gibbosa, 474-479 ; of Zoaea larva of 

 Brachyura, 215 ; of larva of (Jiiuta intesti- 

 iialix, 622-628 ; of pupa of Cirripedia, 

 202 ; of Mysis larva of Crangouidae, 2] 5 ; 

 of larva of Cyclops, 198, 199 ; of larva of 

 Dreissensia, 343; of larva of Ei-liim'* 

 esculentus, 512-518 ; of Insects, 266-280 ; 

 of larva of M<:/iilu-n ni/mra. 394 ; of larva 

 of Ophiothrix fraffilis, 492-498; of larva 

 of Ostracoda, 203 ; of larva of Pedi<-rllina 

 echinata, 402, 403 ; of larva of 7V>W..- 

 xfiiiia, 377, 378; of larva of Plmi'miix 

 (Actinotrocha), 383, 384 ; of larva of 

 Polygordius n/>i>< /////< niahix, 1 49-151 ; of 

 larva of Xi/na/ita iliijitnta, 5:ir.-."ill ; of 

 larva of Terebratulina septentrionalis, 112, 

 41o ; of New England Tornaria larva, 

 577-579 ; of NMSSIHI Tornaria larva, 580, 

 581 ; of the larva of Yum/la ! Tilidium), 

 112-115 



Mi'taliauplins lai'va of I 'i^-tajix, 1!*S; of 

 Stonia1o]ioila, 216 



Metanauplius stage in develojiiiii'iit of 

 Achtheres am/i/ii/iti/ix, 206 



Metanemertini, 118 



Mctanephridia. formation of, in Polygordius, 

 147 



i-is, ih-tinilioii of. 12 



