612 



COMPARATIVE ANATOMY 



Megistocrinus, 307 

 Mdampas, 109 

 Melanidi.1 . <'> 

 Meleaffri.ii a, 17 



,, ni fi.fi/iiritifertt, 17 



Melibe, 13 

 Mellita, 293 



,, testmliiifitft, 293 

 Meloorinidce, 307 

 Mdocrinus, 307 



typus, 307 



Melonites, 289 



,, i/iii/fi/mra, apical system, 340 

 Mdonitidce, 289 

 Membrana limitans, 173 

 Meona ventricosa, apical system, 323 

 Meretrix (Cytherea), 18 

 Meridostemal test, 349 

 Mes-ites, 313 ; ambulacrum, section, 386 

 Mesoblastus, 315 

 Mesodesmatidce, IS 

 Mesoplax, 64 

 Mesorchium, 230 

 Metttbhtsttm, 315 

 Metacrinus, 313 



angulatus, tegmeii calycis, 365 



,, Murray i, 311 



Metaplax, 64 

 Metapodium, 106 

 Metnxlini, 298 

 Micnesthetes, 166 

 Micraster, 293 



,, coraiii/niiiniii, apical system, 324 

 Millericrinus, 310 

 Milncria, 49 

 Mimaster, 296 

 Mithrodia, 2'.t!> 

 Miim, 101 

 Mitridce, 6 

 Modiola, 15 

 Mndiolaria, 15 

 Moira, 503 



Mollusc, hypothetical primitive, 26 

 Molpadia, 287 



rliilfiitiix, 488 

 Mnl/Hiiliiiln, 387 

 Monocyclic base (Grin.), 328 

 Monocydica, 303 

 t, 8 



iii. 14, 124 ; .shell, 64 

 Monopleurida', IS 



Monotocardia, 5 ; diagram, 31 ; gills, 90 

 Mmifncuta, 93 

 Muelleria (Moll.), 124 

 MuMeriacea, 124 

 Muelleridtz, 124 

 Mulleria (Echin.), 285 

 Murex, 101 



trim fa lux, alimentary canal, 189 

 Ma rii-iiln , fi 

 Mi'fehi, 17 

 Mali I inn , fil 



Myarca, IS 

 Mi/iiiln, 64 

 M iiiiilif , 10 

 M I/IK-IIII mo, 51 

 M//<i/i.xi<l(i , 24 

 Mi/fiiitr<ii:hHs, 2SS 



246 



, 15 



M i/l /lux rilnlix, 15 



M i/.i-iister, 298 



NACELLA, 108 

 Nacreous layer of shell, 57 

 , 108 



i , 107 

 Natantia, 10 



Xntii-ii .liixi'jiliini/, 107 ; swelling of fnut. 

 119 



Xu.tii iiin. <; 



.' .' 



, ..'.'; eye, 169; diagram, 37; 

 gonads, 230 ; nervous system, 

 145, 146 : pallia! complex, 

 82 ; tentacles, 117 



Po/iqiilinx, 22 



group, 68 

 Nectria, 296 



Needham's (spermatophoral) pouch, 238 

 , 303 



in, 3 



, 3 



tri, 78 



Nefttunea, contraria, 160 



Neritidce, 5 

 Neritince, 5 

 Neritopsidce, 5 



Notaeum, 10 

 ri-liux, 10 



[in n<-tiii i ix, nervous system, 141 



i.', 10 



90 



/"'", 11 

 Nuchal plate, 126 

 Xiti-lt'iililitxtiilii , -115 

 Nucula, 14- ; ctenidia, 85 



n nr/i'llx, 14 



i;, 14 



12 



OCTOPODA, 24 



Or/,,/,, nliilil , 24 



Octopus, 24 ', anatomy, 147 ; nervous 

 system, 148 



,, fii/i/iii-i.x. ,.'.'/ gonad, female, 231 ; 



male, 239 



Ocular plates (Echinoid.), 321 ; (Ast.) 354 

 Odoutoblasts, 183 

 Odontophore, 336 

 < h</<i/ixiiln , .'4 

 o// ( /'v/'//'.v. 293 

 Oliva, 30 



