72 
PACIFIC SCIENCE, VoL XV, January 1961 
Fig. 5. Sagitta pseudoserratodentata Tokioka, seminal vesicles, two phases observed. 
Sagitta euneritica n. sp. 
The body is very translucent, almost trans- 
parent as in Sagitta setosa Muller; however, 
the larger specimens which mature at a size over 
13 mm. in length appear less transparent. The 
body is uniform in width, narrowing at the 
head and at the tail ends. The rather poorly 
marked neck region is filled by a collarette. 
Viewed dorsoventrally on a dark background, 
the gut appears as a narrow white line extending 
from the head down to the body as in S. setosa. 
The anterior fins do not reach the ventral 
ganglion. They are wider at the posterior end 
and have no rayless zone. 
The posterior fins lie more on the trunk than 
on the tail. They are longer than the anterior 
fins, broadest behind the level of the tail septum, 
and they end touching the seminal vesicles. 
They are without a rayless zone (Fig. %a) . 
The head is somewhat square and regular in 
size. 
The eye pigment is gathered into a rather 
perfect square with several clear spots which 
differ in position and shape from those of 
5". setosa and S. euxina Moltschanoff ( Furnestin, 
1958) (Fig. 8c, d). 
The collarette is well developed with the 
characteristic structure of round cells in a net- 
work. 
The sensorial cells are spread all over the 
body as they are in S. setosa and S. friderici 
Ritter-Zahony. 
The seminal vesicles are in contact with the 
tail fin and with the posterior fins. They are 
not very prominent, being small and similar to 
