INDEX. 



303 



Hydra, apparent harsh treatment of, 



159. 

 Hydra, food of, 157. 



fusca, 155, 158. 



'parasitic infusoria on, 160, 

 Ifil. 



reproduction of, 158. 



stings of, 158. 



tentacles, 156. 



to permanently preserve, 161. 



translation from Trembley on 

 the, 159. 



Hydra viridis, 155, 158. 

 Hydrachna, 267, 269. 

 Hydrachnidce, 266. 



I. 



Ickthydium podura, 172. 

 Impatiens fnlva, raphides in, 289. 

 Infusoria, 61, 131. 



colors of, 135. 



free-swimming, means of move- 

 ment, 135. 



Infusoria, illoricate, 134. 



in infusion of hay, 134. 



key to genera of, 138. 



loricate, 133,134. 



parasitic on Hi/dm, 160, 161. 



parasitic on Megalotrocha, 215. 



permanently adherent, 134. 



preservation of, 137. 



structure of, 133. 



to collect, 131. 



to kill, for examination, 137. 



to study, 136. 



water colored red or green by, 

 149. 



Insects, eggs of, 281. 



eyes, 279. 



feet, 279. 



from the cellar, 274. 



gizzard of, 281. 



probosces, 280. 



to examine, 281. 



Iodine mixture for killing infusoria, 

 137. 



Iris versicolor, crystal prisms in, 

 290. 



Iron, pcrchloride, for killing infu- 

 soria, 137. 



J. 



Jordan's " Manual of the Verte- 

 brates," x. 



Journal of the Academy of Natural 

 Sciences of Philadelphia, 199, 236, 

 237. 



Katydid, gizzard of, 282. 



Kerona polyporum, 161. 



Key to desmids, diatoms, and fresh- 

 water algae, 71. 



Key to genera of fresh-water algae, 

 103. 



Key to genera of desmids, 74. 



to genera of diatoms, 93. 



to genera of Eutomostraca and 

 Phyllopoda, 245. 



Key to genera of Infusoria, 138. 



to genera of Oligochaeta, 187. 



to genera of Polyzoa, 228. 



to genera of Rhizopods, 115. 



to genera of Rotifers, 207. 



to genera of Water-mites, 266. 



to species of Chcetonotits, 171. 



to species of Closterium, 78. 



to species of Micraxlerias, 80. 



to species of Stentor, 147. 

 Keys, analytical, how to use, 70. 



to Chironomnx, C/uetonotns, and 

 classes of worms, 165. 



L. 



Ladnularia, 207, 208. 

 JLeauminosce, crystal prisms in, 290. 

 Leidy, Dr. J., 61, 193, 194, 199, 236, 



237, 277. 

 Leidy, Dr. J., on Rhizopods of North 



America, 130. 

 Zemwa,48, 57,162. 



flower of, 58. 



minor, 57. 



polyrrhiza, 57. 



raphides in, 289. 



rootlets of, useful to the micros- 

 copist, 58. 



Lens, Coddington, 7. 



pocket, combination, 4. 

 employment for the, 3, 234. 



