NOTFJS OX SPECIES OF SAGITTA — GRAY, 177 



particulars: — The tail fin does not reach the vesiculae 

 seminales in the new species, but does so in S. hipunctata; 

 the posterior fins are shorter than the anterior in the 

 former, but are longer in the latter ; in -S^. hipunctata there 

 is a distinct constriction at the tail septum, but this is not 

 the case in S. morcaucnsis. S. fridrici has less than 50 per 

 cent, of the posterior fins on the body, and the vesicular 

 seminales are reached by the tail fin. These features are not 

 similar to 8. moreauensis. 



The solitary specimen which was captured reacted in 

 & curious way to the reagents used in staining and mount- 

 ing. AVhen the specimen was examined and measured in 

 formalin the width was 14 per cent, of the total length, and 

 numerous sensory papilla were present, but after mounting 

 the width was reduced to 5 per cent, of the total length and 

 the sensory papilhv had disappeared. All the other 

 measurements remained unchanged. 



Length 13-8 mm; width 14 per cent. ; tail length 21 per 

 •cent, of the total length ; tail to ventral ganglion 67 per 

 •cent, of the total length. 



Anterior fins 21 per cent, of the total length ; strong, 

 oblicjue rays throughout ; separated by a considerable 

 distance from the ventral ganglion. 



Posterior fins 18 per cent, of the total length, with 

 strong rays throughout at right angles to the body; 

 separated from the anterior fins by 5 per cent, of the total 

 length ; 50 per cent, in front of the tail septum ; reach the 

 vesiculiv seminales. Collarette small ; anterior teeth 6, very 

 long; posterior teeth 8-11; seizing jaws 10-12, widely 

 spread ; the tips of the jaws are embedded in shaft for one- 

 half their length (Fig. 4). All the jaws are not visible 

 in the figure, as some are masked by others when the head 

 is in this particular position. 



Vesicular seminales very small and inconspicuous; 

 reached by the posterior fins, but not by the tail fin. Ovary 

 with many small eggs. 



The specimen was taken between Durban and St. 

 Paul's Rocks during September, 1919. 



All drawings have been made with a camera lucida 

 from stained and mounted specimens, and corrected for 

 distortion, shrinkage, and damage to the fins by drawings 



