258 



BULLETIN 100, UNITED STATES NATIONAL MUSEUM. 



' 



s. 



SAGITTA NEGLECTA Aida. 



Plate 35, fig. 9. 



Sagitta neglecta AIDA (1897), p. 16. FOWLER (1906), p. 15. 

 RITTER-ZAHONY (1911), p. 23. MICHAEL (1911), p. 

 46. 



This species is represented by approximately 425. 

 specimens (Cat. No. 17927, U.S.N.M.), many of which 

 are mature. Curiously enough, all were taken by a 

 single surface haul on November 22, 1909, in Molucca 

 Passage at station D. 5615, 32.5' south and 126 

 31.5' east. Certain specimens obtained from five or 

 six other stations were at first thought to be 8. neglecta, 

 but closer examinations proved them to be either 

 young 8. serratodentata or 8. ledoti. 



As in so many other cases, the Philippine specimens 

 have more anterior and posterior teeth than those 

 described from the San Diego region. In my former 

 (1911, p. 48) report, the number of anterior teeth is 

 given as 3 to 5 and the posterior teeth as 8 to 1 1 in in- 

 dividuals between 8 and 13 mm. in length. The 

 Philippine specimens, however, are smaller, ranging 

 as a rule between 6.5 and 8 mm. and the number of 

 anterior arid posterior teeth are 4 to 8 and 12 to 16, 

 respectively. This agrees better with Fowler's (1906, 

 p. 16) records for specimens from the Siboga region. 

 He records 3 to 7 anterior and 7 to 15 posterior 

 teeth in individuals between 5 and 10 mm. in length. 

 Similarly, Ritter-Zahony (1911, p. 24) records 5 to 7 

 anterior and 11 to 18 posterior teeth in individuals 

 from Port Natal between 6 and 7.5 mm. in length. 

 TABLE 13. Measurements of Sagitta neglecta. 1 



18 



28 



37.5 



47 



57 



67 



77 



87 



5.f>:',2 



Posterior fin. 



Anterior fin 



25 

 23.52 



22.52.5 

 2 



40 

 10 



37.520.52 

 24 



24 



2.5 



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

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



