LIST OF ILLUSTRATIONS. 



IjKUCISCUS AULA, VAB. BASAK LECCISCUS AtTLA, VAR. RUBELLA LEUCISCUS VULGARIS, VAR. CHAT,YBJEUS Frontispiece. 



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Scale of Gobius - - 6 



Scale of Leuciscus - 6 



Teeth of Salmon 7 



Skeleton of Perch - 8 

 Skull of Perch with the Operculum removed, to 



show the Bones of the Head, the Branchial 



Arches, and the Branchi-ostegal Rays - 9 



Vertebra of Herring 1 10 



Air-bladder of Carp - 11 



Internal Anatomy of Carp 11 



Internal Anatomy of Can' 12 



Perca fluviatilis 24 



Percarina demidoffii 31 



Aceriua cernua - 34 



Acerina schrsetzer - 37 



Lucioperca sandra - 40 



Lucioperca volgensis 43 



Aspro zingel 45 



Aspro vulgaris 47 



Cottus gobio - 50 



Head of Cottus gobio, seen from the front 50 



Cottus gobio, var. microstomus - - 53 

 Head of Cottus microstomus, seen from the 



front 54 



Cottus gobio, var. ferruginous - '54 

 Head of Cottus ferruginous, seen from the front 55 



Cottus pcecilopus 55 



Gobius martensii - - 59 



Scale of Gobius martensii 59 



Blennius vulgaris - 65 



Gasterosteus aculeatus - 74 



Gasterosteus aculeatus, var. brachycentrus 79 



Lota vulgaris - 83 



Silurus glanis - 91 



Cyprinus carpio 95 



Cyprinus acuminatus - 100 



Cyprinus hungaricus - 100 



Cyprinus hungaricus - 101 

 Cyprinus carpio (var. hungaricus). Pharyngeal 



Teeth - - 101 



Cyprinus regina - 102 



Carpio kollarii - - 103 



Pharyngeal Teeth of Carpio kollarii - - 103 



Carassius vulgaris - - - 105 



Carassius moles - 107 



Carassius gibelio ... - 108 



Pbaryngeal Teeth of Carassius gibelio - - 108 



Carassius oblongus - - 109 



Pharyngeal Teeth of Barbus vulgaris - - 114 



Barbus vulgaris - 115 



Barbus plebejus - 118 



Barbus plebejus - 118 



Barbus caninus - 119 



Barbus petenyi - 120 



Aulopyge hiigelii (female) - 126 

 Under side of the Head of Aulopyge hiigelii - 126 



Aulopyge hiigelii : Lateral line and skin, show- 

 ing pigment spots - - 126 

 Aulopyge hiigelii (male) - - 127 

 Pharyngeal Teeth of Aulopyge hiigelii - - 128 

 Gobio fluviatilis - - - 129 

 Head of Gobio fluviatilis, seen from above - - 129 

 Pharyngeal Teeth of Gobio fluviatilis - - 130 

 Gobio nranoscopus - - 131 

 Head of Gobio uranoscopus, seen from above - 131 

 Leuciscus erythrophthalmus - - 134 

 Pharyngeal Teeth of Leuciscus erythrophthal- 

 mus - 135 

 Leuciscus erythrophthalmus, var. dergle - 136 

 Leuciscus erythrophthalmus, var. plotizza - 137 

 Leuciscus erythrophthalmus, var. scardafa - 137 

 Leuciscus scardafa - - 138 

 Leuciscus erythrophthalmus, var. macrophthal- 



mus - 138 



Leuciscus idus - - 139 



Pharyngeal Teeth of Leuciscus idus - 139 



Leuciscus aula - - - 142 



Pharyngeal Teeth of Leuciscus aula - 143 



Leuciscus adspersus - 145 



Leuciscus rutilus - - 146 



Leuciscus rutilus, var. pausingeri - - 149 



Leuciscus pigus - 150 



Pharyngeal Teeth of Leuciscus pigus - - 150 



Head of Leuciscus pigus, seen from below - - 151 



Leuciscus pigus, var. virgo - - - 151 



Leuciscus friesii - - - 154 



Head of Leuciscus friesii, seen from above - - 154 



Pharyngeal Teeth of Leuciscus cephalus - 157 



Leuciscus cephalus - - 157 



Leuciscus cephalus, var. cavedanus - 159 



Leuciscus cephalus, var. albus - 160 



Leuciscus vulgaris - - 161 



Heads of Leuciscus vulgaris - - 163 



Leuciscus vulgaris, var. rostratus - 163 



Leuciscus illyricus - - - 164 



Large scale of Leuciscus illyricus - - 165 



Leuciscus svallize - - 166 



Leuciscus ukliva - 167 



Leuciscus tnrskyi - - 169 



Leuciscus microlepis - 170 



Leuciscus tenellus - - 171 

 Leuciscus muticellus 



Pharyngeal Teeth of Leuciscus muticellus - - 172 



Leuciscus muticellus, var. savignyi - 174 



Leuciscus phoxinus - - 17*> 



Pharyngeal Teeth of Leuciscus phoxinus - - 176 

 Paraphoxinus alepidotus 



Pharyngeal Teeth of Paraphoxinus alepidotus - 187 

 Tinea vulgaris - 



Pharyngeal Teeth of Tinea vulgaris - 190 



Chondrostoma nasus - 1W 



Head of Chondrostoma nasus, seen from below - 194 



