INDEX. 



'Alternations of generation' definition 

 of term,l; distinction between it 

 and ' Metai/iorphosis' 6 



Amphistoiiiiini clavatum, 99 



Aiiadonta, animalculse in, and on, 90 



Ancyhis lac list r is, 95 



Ants, feeders among, 109 



Aphides, mode of generation of, lOS 



Ascidiix, Milne Edwards on, 47; de- 

 scription of young, 48 ; circulation 

 of blood in, 47 



Aspidogaster conchicola, 93 



Astacus fluviatilis, occurrence of Bisto- 

 mata va. muscles of, 95 



Baer on Distoma diipUcatum, 92 



Batracliians Trematoda enter from 

 without, 99 



Bees, "feeders" among, 109 



Bojanus, yeUow cylindrical worms of, 

 62 



Bothriocephahis, nature ol^ 103 



Botrgllus, 48, 50, 51 



Bucephalus polymorphus of Baer, proba- 

 bly only a nursing animal, 96 



Gampanulariai, Loven on, 32 



Campanularia genicula-ta, description 

 and development of, 32 ; " nurses'" 

 of, 36 



Cercarice, description of pupa state of, 

 57; developed from " King's yellow 

 worms" of Bojanus, 62; description 

 of development, 64 ; mode of exit 

 fi'om " nurses," 65 ; frequency in 

 auricle of snail, 66 ; origin of nurses 

 of, 69; "Nests," 68; "Parent 

 nurses'" of, 69 



Cercaria echinata, description of, 53; 

 armata, description and develop- 

 ment of, 74; pupa state of, 77; 

 Distoma wliich originates in, SO ; 

 ephemera, "nurses" of, described 

 only by Siebold, 87—88 ; Mitzsch's 

 observations on pupa state of, 88 ; 

 Distomata developed from, ib. 



Cestoid entozoa, Miescher's memoir 

 on, 102 



Cestoid worms, resemblance to vege- 

 tables, 104 



Cliamisso, 1819, on the alternate ge- 

 neration of Salpce, 40 



" Chaotic swarm" of Baer, 90 



Claviform Polypes, 26 



GolpodiuM, 90 



CoraUine Polypes, 37 



Corymorpha mutans, 27, 30 



Coryne, 26; Ehi'enberg on, 27; fritil- 

 laria, description and development 

 of, 27; aculeata,oQ; vtdgaris, 31 



Cyancea capillata, 25 

 vstic 

 "lOO 



Diplostonmm clavatum-, 98 ; voloens, ib. 



Distoma, 59 



Distoma hepaticum, 52; dMplicatum, 87; 

 larva of Aspidogaster conchicola, cer- 

 tainly a larval form, 93; "Parent 

 nurse" of, ib. ; " Nurses" of, ib. ; 

 cirrigerum, 95 ; anmdigerum, 99 



Distomata developed from Cer. ephem.. 



Echinorynchi, " loose ovaries" of, their 

 probable nature, 101 ; mode in. 

 which they penetrate into the ani- 

 mals infested by them, ib. 



Elu'enberg on Coryne, 27 



Ephyra, 19—20 



Eschricht, examination of his theory 

 of the development oiSalpm, 40, 42 ; 

 Observations on the Echinorynchi 

 of Haddock, 101 ; on Bothriocepha- 

 lus, 103 ; anatomical researches on 

 the Salpce, 112 



Germ-sacs of Siebold, the "nurses" 

 of, Cer. ephem., 89. 



Uolostomum cuticola, 98 ; hreiucauda- 



tum, ib. 

 Hydatid cysts, containingZ^/.'j^w«/*, 98. 



