204 



Index 



mollusks (see also snails, gastropods, 

 etc.) 



boring, 38 



dilution toleration, 71 



haemocyanin, 102 



haemoglobin, 120 



in Lake Tanganyika, 43 



in Thames estuary, 28 



land, 93 



on Krakatao, 46 



locomotion, 125 



respiration, 109 

 monocarbonate, 58 

 Monocelis fusca, 45 

 mosquitoes, in sunny pool, 90 



larvae, classified, 35 

 gills, 102 

 in saline pools, 45 



spreading parasites, 50 

 mud, as food, 57 



fishes living in, 36 



in mangrove marshes, 26 

 mudline, in estuaries, 22 

 mud minnow, activity, 90 

 mullets, 43 



mussel, salt toleration, 77 

 Mya arenaridj 24 

 myriapods, in soil, 39 



on land, 16 



terrestrial, 93 

 mysidaceans, in Ganges delta, 27 

 Mysis, 42 

 Mytilis, 43 



M. edulis, salt toleration, 77 



Naviculina, 27 

 Necturus, respiration, 106 

 needle-fishes, 43 



Nemachilus, respiration, 104 

 nematodes, carbon dioxide poison- 

 ing, 59 



integument, 98 



in the soil, 93 



parasitic on crabs, 67 

 nemerteans, haemoglobin, 120 



in ground, 96 

 Nemobius fasciatus, 53 

 Neomysis vulgaris, 29 

 Neptunus, respiration, 109 

 Nereis, 41 



oxygen used, 58 



reproduction, 131 



salt toleration, 74, 75 

 neryous system, changes in, 127, 143 



, American, 106 



parasites, 67, 141 



sense organs, 128 



Vermillion spotted, parasites, 67 

 Nile River, 23 



nitrate, as food requirement, 57 

 nitrocarbons, 5 

 nitrogen, 6, 7 



in open sea, 9 



in sea water, 42 



necessary to plants, 56 

 nocturnal animals, desiccation, 94 



energy, 90 



ocean, compared with fresh water, 

 13 



compared with land, 13 

 Ocypode, 38, 45, 65 



eyes, 127 



gills, 98 



respiration, B>6, 109 

 Ocypode albicans, blood salinity, 113 



