268 



INDEX. 



Teeth, emlryoruc, in Birds. 

 Teeth, embryonic, in Birds, li. 

 Teldophores, i6o. 

 Teleostei, Isxii, Ixxxiii. 

 Telson, as segment, 95. 

 Testis, with a rudimentary ovary com- 

 bined with it, Ixv. 



— superadded to an ovary in certain 

 Fishes, Ixxix. 



Thalestris, 115. 

 Thread-cells, cxxviii ; 1 59. 

 Thymus of Frog, 185. 



— homologue of, in Fish, 41. 

 Thyroid of F^•og, 185. 

 Toad, skeleton of, 39. 

 Tomopteris, cxxviii. 



Tongue, sheath of, in Ophidia, 30. 

 Tracheata Arthropoda, cv, cvi. 

 Transition piece in Hydroid Zoophytes, 



161. 

 Trematodes, cxl ; 138. 

 Trilobites, 112. 

 Tropidonotus natrix, 39. 

 Tubicolar Annelides, 123, 157. 

 Tubulipora, 147. 

 Tunicata, c. 



— classed with Vermes by Gegen- 



baur, ci. 



— supposed similarity of development 



into that of Vertebrata, ci. 



— Turbellarian Vermes, cxl; 138, 155. 

 Turner, Professor, i. 



J 



U. 



Umbilical vein, 182. 



Unsymmetrical viscei'a of Ophidia, 29. 



Zooids. 

 Unionidae, S4-66, 192-198. 

 Uterus, 169, 172. 



y V. 



Vas deferens, 177. 



Vegetables, distinction of, from Ani- 

 mals, clxii, clxiii. 

 Vena azygos, 2. 

 Vena cava, 169. 

 Vermes, cxxii ; 152, 153. 

 Vertebrae, Ixix. 

 Vertebrata, xxxi ; 167. 

 Vesicular seminales, 125. 

 Vibrios, xvii. 

 Vibrissae, 4. 

 Volvocineae, clxii. 

 Vorticlava, 162. 



W. 



Waterhouse, Mr., 4. 

 Water vascular system in Mollusca, 

 Ixxxvi. 



— in Vermes, cxxiv, cxxxiv. 



— in Echinodermata, cxlv, cliv. 

 WolflBan body, Ixv, Ixxv ; 172. 



Zaddach, 75, 85-113, 119, 

 Zenker, 118. 



Zoea, larval form in developing Crus- 

 tacea, 115. 

 Zooids, 164. 

 — relation of, to organs, 162. 



