IV 



INDEX. 



Page. 



pulchra (Sagitta), distribution of 252 



Philippine records of oc- 

 currence 264 



variability in number of 



teeth 263 



richardi (Eukrohnia), measurements of 267 



validity of 267 



Sagitta, key to species of 238 



species collected 235 



validity of*. 237 



serratodentata (Sagitta), distribution of 2-50 



measurements of . . . 249 

 Philippine records 



of occurrence 250 



variability in num- 

 ber of teeth 249 



Spadella, key to species of 239 



validity of 237 



subtilis (Krohnitta), distribution of 270 



measurements of 269 



teeth (variability in number of), Eukrohnia 



hamata... 266 

 Pteros agit- 



ta draco.. 264 

 Sagitta de- 



cipiens ... 254 



S. enflata... 242 



neglecta . 258 

 plankto- 



nis 263 



serrato- 

 dentata 249 

 S i g n i f i - 



cance of 272 



o 



