64 University of California Puhlications in Zoology. [Vol.8 



glance, least so among smaller individuals, but becoming more 

 and more apparent as the length of specimen increases. I 

 believe an extensive tabulation in this regard would present 

 definite differences of much value in classification. 



REDESCRIPTIONS OF SOME DOUBTFUL SPECIES OF 

 CHAETOGNATHA 



Sagitta hispida Conant 



Sagitta hispida Conant (1895), p. 78, fig. 7; Aida (1897), p. 18. 

 Sagitta robusta Doncaster (1902b), p. 212; Fowler (1906), p. 19. 



After some difficulty I have been fortunate enough to obtain 

 one specimen of 8. hispida which was identified by Conant him- 

 self. The specimen was obtained from Beaufort, North Caro- 

 lina, and deposited in the United States National Museum. 

 Through the courtesy of that institution I have been enabled to 

 restudy the species. 



The specimen is not in the best conditon for extensive study, 

 so that there are many points which can not be determined. 

 Like many Chaetognatha w^en preserved in alcohol, this speci- 

 men has not only shrunken, thereby making the width measure- 

 ments appear too small, but it has also turned almost black, 

 making it impossible to count the teeth or seizing jaws, or to 

 locate the ventral ganglion. However, in connection with the 

 literature, I believe the specimen presents enough facts to permit 

 us with safety to identify it with *S. robusta Doncaster. 



Below is given a table of comparison for the two species, the 

 information for which has been obtained from Doncaster 

 (1902b), and Fowler (1906) for S. robusta, and from Conant 

 (1895), and from the above-mentioned specimen for S. hispida. 



TABLE 22 



Comparison of S. hispida and S. robusta 



Characters <S'. hispida S. robusta 



Length in mm -. 5.5-11 10-14 



Width in per cent of length 4.2-4.3 5.7 



Lateral fields small small 



Muscles strong strong 



Consistency firm firm 



