32 University of Califoniia PuhUcations in Zoology. [Vol.8 



TABLE 2 

 Measurements of Sagitta hexaptera^ 



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

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



Sagitta hexaptera in general resembles S. enflata, and more 

 especially S. lyra. It differs, however, from the former by its 

 greater size, tooth-fornmla, and various proportional measure- 

 ments. From the latter it differs radically in the absence of 

 confluence of anterior and posterior fins, and in nearly all pro- 

 portional measurements. Practically the only similarity between 

 the two species consists of size, degree of transparency, and 

 tooth-formula, the latter being often identical. 



Sagitta l3n:a Krohn 



PI. 1, fig. 3; pi. 3, fig. 16; pi. 4, fig. 29; pi. 6. fig. 43. 



Sagitta lyra Krohn (1853), p. 272; Hertwig (1880), p. 61; Grassi 



(1883), p. 11; Ritter-Zahony (1908), p. 10. 

 Sagitta hexaptera Strodtmann (1892), p. 10; Moltschanoff (1907), 



p. 209. 

 Sagitta furcata Steinliaus (1896), p. 26; Krumbach (1903), p. 630; 



Fowler (1905), p. 63. 

 Sagitta whartoni Fowler (1896), p. 992; Giinther (1903), p. 336. 

 Spadella maxima Conant (1896), p. 212. 

 Sagitta gigantea Broch (1906), p. 146. 

 Sagitta maxima, Ritter-Zahony (1910), p. 264. 



General Appearance 



When well-preserved S. lyra appears translucent, nearly 

 transparent upon a black background (pi. 1, fig. 3). The general 

 color of the body is grayish-slate, the ovaries and intestines 



