CHAET0ÜXATHS OF MISAKI HARBOR. 



L5 



•A. Sagitta hjra, Krohn. 

 (Fig. 4.) 



Literature: Langerhans (1), Hertwig (2), Grassi (3;. Steodtmann (i). 



I fished only a few individuals of this species together with Sagitta 

 hexaptera during the spring of 189(5. The largest specimen I have 

 caught was 3 cm. long, and its caudal segment 4.5 mm., but its genital 

 organs were not ripe. 



This species has a very wide trunk and a narrow caudal segment, 

 and two pairs of lateral fins which are continued into each other, 

 the first pair being long and extending anteriorly to tbe level of the 

 abdominal ganglion. 



5. Sagitta minima, (Grassi). 



(Fig. 5.) 



Literature: Grassi (3), Steodtmann (4/. 



This is a small-sized species. The larger individuals reach the 

 length of 1 cm. and its caudal segment the length of 1.5 mm. 



The epidermis is thin. The lateral field is pretty wide. As the 

 body is widest in the lower part of the trunk and the caudal segment is 

 comparatively narrow, it is constricted at the border of these two 

 segments as, in Sagitta lyra- The top of the seizing hook is strongly 

 curved inwards. The ovaries are short, and generally terminate at the 

 level of the anterior end of the second lateral fin. The corona ditata 

 is elliptic and lies wholly on the trunk segment. The intestine is very 

 wide, nearly filling up the body cavity, and shows here and there trans- 

 verse wrinkles. It has two diverticula at its beginning. 



6. Sagitta enfiata, (Grassi). 



(Fig. a.) 



Literature: Grassi (3), Strodtmann (4). 



This species is abundant in Misaki. It can be fished at all seasons 



