1911] Michael: Chaetognaiha of the San Diego Region. 



63 



TABLE 21 

 Measurements concerning the Ovary in Sagitta neglecta. 



i I 



1 Measured in per cent of total length of animal. 



2 Measured in per cent of total length of ovary. 



In the eleven specimens there is not a single instance of any- 

 thing approaching maturity. Nos. 3*8, and 11, according to my 

 notes, are marked "well-developed but scarcely approaching 

 maturity." All the others are clearly remote from maturity. 

 The probabilites are that no. 8 represents nearly the maximum 

 length of the ovary, but of this I can not be certain until I have 

 more material with which to work. 



The specimens of other species from this region in our collec- 

 tions are too few in number or too immature to allow any sig- 

 nificant measurements of the ovary. We may however, in a 

 general manner, divide the San Diego Sagitta into two groups. 



1. Ovary long and slender, extending nearly to the ventral 



ganglion. This group includes *S'. planktonis, S. 

 hexaptera, S. lyra, and S. serratodentata. 



2. Ovary short and thick, never extending much beyond 



the anterior limit of the posterior fin. This group 

 includes S. enflata, S. hipiinctata, and probably /^. 

 neglecta. 



These groups are very apparently different, even at first 



