LIST OF ILLUSTRATIONS.

Leaf Butterfly in flight and repose (from Mr. A. Wallace's "Malay Archipelago") ... [31]

Walking-Leaf Insect ... [35]

Pleuronectidæ, with the peculiarly placed eye in different positions (from Dr. Traquair's paper in Linn. Soc. Trans., 1865) ... [37], [166]

Mouth of Whale (from Professor Owen's "Odontography") ... [40]

Four plates of Baleen seen obliquely from within (from Professor Owen's "Odontography") ... [41]

Dugong ... [41], [175]

Echinus or Sea Urchin ... [43], [167]

Pedicellariæ of Echinus very much enlarged ... [44]

Rattlesnake ... [49]

Cobra (from Sir Andrew Smith's "Southern Africa") ... [50]

Wingbones of Pterodactyle, Bat, and Bird (from Mr. Andrew Murray's "Geographical Distribution of Mammals") ... [64], [130], [157]

Skeleton of Flying-Dragon ... [65], [158]

Centipede (from a specimen in the Museum of the Royal College of Surgeons) ... [66], [159]

Teeth of Urotrichus and Perameles ... [68]

The Archeopteryx (from Professor Owen's "Anatomy of Vertebrata") ... [73], [132]

Cuttle-Fish ... [75], [141]

Skeleton of Ichthyosaurus ... [78], [107], [132], [177]

Cytheridea Torosa (from Messrs. Brady and Robertson's paper in Ann. and Mag. of Nat. Hist., 1870) ... [79]

A Polyzoon, with Bird's-head processes ... [80]

Bird's-head processes greatly enlarged ... [81]

Antechimis Minutissimus and Mus Delicatulus (from Mr. Andrew Murray's "Geographical Distribution of Mammals") ... [82]

Outlines of Wings of Butterflies of Celebes compared with those of allied species elsewhere ... [86]

Great Shielded Grasshopper ... [89]

The Six-shafted Bird of Paradise ... [90]

The Long-tailed Bird of Paradise ... [91]

The Red Bird of Paradise ... [92]

Horned Flies ... [93]

The Magnificent Bird of Paradise ... [93]

(The above seven figures are from Mr. A. Wallace's "Malay Archipelago")

Much enlarged horizontal Section of the Tooth of a Labyrinthodon (from Professor Owen's "Odontography") ... [104]

Hand of the Potto (from life) ... [105]

Skeleton of Plesiosaurus ... [106], [133]

The Aye-Aye (from Trans, of Zool. Soc.) ... [108]

Dentition of Sabre-toothed Tiger (from Professor Owen's "Odontography") ... [110]

Trilobite ... [135], [171]

Inner side of Lower Jaw of Pleurodont Lizard (from Professor Owen's "Odontography") ... [148]

Solenodon (from Berlin Trans.) ... [149]

Tarsal Bones of Galago and Cheirogaleus (from Proc. Zool. Soc.) ... [159]

Squilla ... [160]

Parts of the Skeleton of the Lobster ... [161]

Spine of Galago Allenii (from Proc. Zool. Soc.) ... [162]

Vertebrae of Axolotl (from Proc. Zool. Soc.) ... [165]

Annelid undergoing spontaneous fission ... [169], [211]

Aard-Vark (Orycteropus capensis) ... [174]

Pangolin (Manis) ... [175]

Skeleton of Manus and Pes of a Tailed Batrachian (from Professor Gegenbaur's "Tarsus and Carpus") ... [178]

Flexor Muscles of Hand of Nycticetus (from Proc. Zool. Soc.) ... [180]

The Fibres of Corti ... [279]