THE GEPHYEEA OF JAPAN. 41 



half acconipanied by a mesentery. Two eye-spots present on 

 the ganglion. 



This species is one of the commonest Sipimculoids met with 

 in the Rinkiu and the Amami-Oshima Islands. 



As in the Philippine specimens described by Selenka, a 

 fixing mnscle is distinctly present. But it may be pointed out 

 that unlike them the muscle terminates on the intestine not 

 with one end, but with two branches ; one of these is attached 

 to the hindmost part of the œsophagus, while the other is joined 

 to the spindle muscle just at the beginning of the intestinal 

 conv^olution. The hooks on the introvert are provided with two 

 distinct rows of small warts lying at the hook base. This fact has 

 not been mentioned in the case of foreign specimens of the species. 



ASPIDOSIPHON MISAKIENSIS, n. sp. 



(Figs. 9, 68-72). 



This species is a small form (Fig. 9). The body proper 

 rarely exceeds 20 mm. in length and 5 mm. in width; the introvert 

 is unusually long, being at least three times as long as the body 

 proper. The color in the fresh state is a light brownish pink, 

 the introvert-basis as well as the anal and caudal shields being 

 shaded a deeper brown. The anal shield is oval in shape and is 

 composed of minute calcareous granules of a deep brown color ; 

 only the periphery of this shield exhibits short radial grooves 

 (Fig. fj8). In the anal region, the skin is covered with large 

 and closely set papillie of a deep brown color which are composed 



