11 



Ï. AIDA. 



there are some discrepancies in the number of the seizing hooks and 

 teeth. Our specimens have G-7 seizing hooks, 10-12 anterior teeth, and 

 18-21 posterior teeth, while Grassi (3) and Strodtmann (4) give for 

 European specimens 8-10 seizing hooks, 4 — 6 anterior teeth, and 

 10—15 posterior teeth. Thus our specimens have a greater number 

 of teeth and a smaller number of seizing hooks than those of Europe. 

 Notwithstanding this difference, I think it correct to refer them to the 

 same species, as they agree in so many other characters. 



2. Sagitta serratodentata, Krohn. 



(Figs. 2 & 3.) 



Literature: Grassi (3), Hketwig (2), Strodtmann (4). 



This species is rare in Misaki, and I caught only three during the 

 spring of 1890. It resembles closely Sagitta bipunctata, but is distin- 

 guished from it by its serrated seizing hooks, thinner epidermis and 

 smaller size. 



y Strodtmann (4) states that the tip of the teeth is distinctly star- 

 shaped in this species and has at its center the opening of the canal 

 which runs through the body of the teeth. But I was unable to find 

 such an opening in the teeth of our species. The canal ends at the top 

 of the teeth blindly and four processes of different size surround the top 

 (fig. 13). 



3. Sagitta hexaptera, D'Orbigny. 



(Fig. 3.) 



Literature: Langerhans (1), Hertwig {■!), Grassi (3), Strodtmann (4). 



All the specimens of this species which I have fished are young, 

 with unripe genital organs. The pear-shaped corona ciliata on the head 

 segment, the wide lateral field, the number of the seizing hooks and 

 teeth, and the shape and position of the lateral fins, all point to the 

 identity of this species with that described by European authors. 



