Invert"brate, nervous system, [13], [54]

Invert"brate, segmental nerves, [152]

Keraspis, [75], [328], [338]

Kidney, [420], [459], [476]

Kid"ey, nerves, [477]

King-crab, v. Limulus

Labyrinthodont, [21], [28]

Lamina terminalis, [49]

Lamprey, v. Ammocœtes and Petromyzon

Larva, v. Transformation of the Lamprey