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BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



to fourth or fifth tooth. External process one-third to one-half 

 length of ridge and approximately four times longer than broad. 



Anterior teeth 5 to 9, closely set and diverging distally. Posterior 

 teeth (pi. 37, fig. 19) 10 to 13, not so closely set nor so divergent dis- 

 tally as anterior teeth. 



Seizing jaws (pi. 37, fig. 23) 5 to 6 in number. Point with oval 

 base inserted little more than one-tenth its height into shaft. Base 

 of point and top of shaft parallel. Edge of shaft provided with 

 broad thin crest. Pulp-canal central, with pulp evenly distributed 



throughout. 



Table 7. — Measurements of Sagitta pulchra. 1 



1 All measurements made in per cent of total length of animal. 

 s Per cent of posterior fin in front of tail-septum. 



Distribution. — -S. pulchra was collected from 23 stations, or from 

 exactly 50 per cent of those at which chaetognaths were taken. Of 

 these only 5 were mesoplanktonic stations, and 14 of the remaining 

 18 were surface stations. There can be no question, therefore, that 

 the species is typical of the upper epiplankton in the Philippine region. 

 Its northernmost record of capture during the Philippine expedition 

 is in the China Sea, near Hongkong, 20° 58' north and 120° 3' east; 

 its southernmost record is in Buton Strait, 5° 36.1' south and 122° 

 7.6' east; its easternmost record is in the Gulf of Tomini, Celebes, 

 125° 17.1' east and 1° 13.2' north; and its westernmost record is in 

 Macassar Strait, 118° 50' east and 2° 19.5' south. The largest 

 number (128 + ) was taken August 11, 1909, at 7.49 in the after- 

 noon by a 0000 grit-gauze net towed on the surface between Siquijor 

 and Bohol Islands, at 9° 27.5' north and 123° 38' east. Other 

 species taken at the same station are S. enfiata (169), S. lyra (85), 

 S.ferox (50), and S. bedoti (14). 



