LIST OF ILLUSTRATIONS. 



XXXV 



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 246. 

 247. 



Sipunculus, or rough Syrinx, Original, 



PAGE 



117 



Nutrimental canal of Sipunculus, do. 117 



Muscular coat, Sipinuculus, ....... do. 118 



Serpula contortuplicata, do. 119 



Nutrimental organs, Aphrodita aculeata, do. 119 



Mouth of Leech, do. 120 



One jaw of mouth of Leech, do. 120 



Alimentary canal of Leech, do. 120 



Arenicola piscatorium (fisherman's worm), . . Hunterian Museum, 121 



Actheres percarum, parasitic on the Perch, .... Nordmann. 122 



Male of Actheres percarum, do. 123 



Nutrimental organs, Lepas vitrea, . . . . Original, 124 



Stomach of Lobster (external surface), do. 126 



Stomach of Lobster opened to show gastric teeth, . . do. 126 



Longitudinal section of Lobster, do. 127 



Coleopterous wings (Beetles), do. 132 



Hemipterous wings (Tree Bugs), do. 132 



Lepidopterous wings (Butterflies), do. 132 



Neuropterous wings (Dragon Flies), do. 132 



Hymenopterous wings (Bees, Wasps), do. 132 



Dipterous wings (House Flies, &c.) ...... do. 133 



Upper portion of mouth, Cicindela hybrida, .... do. 133 



Lower portion of Cicindela hybrida, do. 133 



Alimentary canal, Cicindela campestris, .... do. 134 



Crop of Dyticus marginalis, . . .... . . do. 134 



Upper part of mouth, Tree Bug, . ..... . do. 135 



The rostrum of Tree Bug, do. 135 



Alimentary canal, Cimex lectularius, do. 135 



Alimentary canal, Blatta Americana, ..... do. 136 



Lateral view of gastric teeth of Blatta Americana, . . do. 137 



Lateral view seen in situ, .. #. ...-.. ,v . . do. 137 



Pavement epithelium of membrane below gastric teeth, . do. 137 



Salivary glands, Blatta Americana, do. 137 



Alimentary canal, Locusta viridissima, do. 138 



Proventriculus of Gryllotalpa, do. 139 



One row of teeth more highly magnified, .... do. 139 



Ileum, Acheta domestica, . do. 140 



More highly magnified view of the intestinal glands of Ileum, do. 140 



Mouth of Butterfly (Cynthia cardui), do. 140 



Alimentary canal (Pontia Brassica), ...... do. 141 



Nutrimental organs, Cossus ligniperda, do. 142 



Spinneret of Cossus ligniperda, . . ... . . do. 143 



Highly magnified view of liver of Caterpillar, .... do. 143 



Upper part of mouth of Libellula, . . ..... do. 144 



Lower portion of mouth of Libellula, do. 145 



Mouth of Hymenoptera, ........ do. 145 



Nutrimental organs, Apis mellifica, do. 146 



Upper portion of mouth, Helophilus tenax, .... do. 147 



Under lip of Helophilus tenax, do. 147 



Nutrimental organs, Musca camaria, ..... do. 148 



Demodex folliculorum, ........ Authors, 151 



Demodex from the scalp, ....... do. 151 



Demodex, magnified, do. 151 



