INDEX TO TECTIBRANCHIATA, 



WITH SPIRAL, EXTERNAL' SHELLS. 



NOTE. The names of species believed to be valid are printed 

 in Roman type ; the names of genera and other groups in SMALL 

 CAPITALS ; the names of all synonyms are in Italic type. 



. 351 

 . 290 

 . 146 

 . 290 

 . 388 

 . 324 

 . 146 

 . 152 

 . 261 

 . 267 

 262, 265 

 . 145 

 . 154 

 . 371 

 . 196 

 . 172 

 . 280 

 . 224 

 . 264 

 . 388 

 . 390 

 . 327 

 . 343 

 . 335 

 . 353 

 . 329 

 . 268 

 . 134 

 . 260 

 . 410 

 . 347 

 . 361 



427 



