civ GENERAL INDEX. 



Page Sec. 



Structure of gastric dental apparatus 437 . 1133 



Professor Williamson's account of the digestive organs of Meli- 



certaringens . . 438 1134 



Nervous system of Eotifera 440 



Views of Ehrenberg 441 



Williamson . 441 



Leydig 442 



Huxley 442 



Tentacular apparatus ., 442 



Circulation in> the Rotifera 443 



Respiratory system ; . 443 



" Water-vascular system " 445 



Organs of generation 445 



Generative organs of Melicerta 445 



Embryogenic development 446 



Formation of tube of Melicerta . . f \ 446 



Generative system of Asplanchnia 447 



Female produces three kinds of ova 447 



Remarkable organization of male Asplanchnia 447 



Difference of form in the two sexes . . . . 448 



1439 

 1140 

 1143 

 1144 

 1145 

 1146 

 1147 

 1148 

 1152 

 1154 

 1155 

 1155 

 1157 

 1158 

 1158 

 1159 

 1162 



CHAPTER XVI. 

 CIRRHOPODA. 



CIRRHOPODA Characters of the class 449 . 1164 



External anatomy of Pen telasmis vitrea 449 . 1164 



Nervous system of Pen telasmis 451 . 1166 



Muscular system of Pentelasmis 451 . 1167 



Digestive apparatus 452 . 1169 



Circulatory system 452 . 1170 



Senses of the CIRRHOPODA 453 . 1171 



Visual organs 453 . 1171 



" Olfactory apparatus " 453 . 1172 



" Acoustic sacculus " 454 . 1173 



Generative system 454 . 1174 



, views of John Hunter 455 . 1 1 74 



Cuvier 455 . 1175 



, researches of Mr. Darwin . 456 . 1177 



" Complements! male " 456 . 1177 



Structure of the " complemental male " of Ibla Cummingii . . 456 . 1178 



Hermaphroditism of Ilia quadrivalvis 457 . 1180 



Larvae of Ibla quadrivalvis 457 . 1181 



Development of ova 458 . 1182 



Balani 459 . 1184 



Metamorposes of the Balani 459 . 1185 



Lepades 460 . 1186 



Conversion of the locomotive larva into the fixed and pedunculate 



Cirrhopod 460 . 1187 



Structure of the antennae 460 . 1188 



Cement-gland 461 . 1189 



Structure of the newly attached larva 461 . 1190 



CHAPTER XVII. 



HETEROGANGLIATA (OWEN) ; MOLLUSCA (CUVIER). 

 General review of the Molluscous division of the Animal Kingdom 462 . 1191 



