TTTE GEPHYREA OF JAPAN. 00 



The papillîTe of tlie body proper and of tlie introvert, are 

 nearly of the same form, size, and structure as in Hilgendorf's 

 specimens. The scattered hooks also show the same form and 

 color as in those specimens, but are very much smaller (0.20 m???. 

 high), being only half as high as Hilgendoef's (OAOmm.). 

 The tentacles are reddish brown. In my specimens, they are 

 given off from the free margins of the eight arms produced by 

 the dichotomous branching of each of the four main stems (Fig. 

 90). Some few short tentacles are also present along the inner 

 margin of each main stem. The above mode of branching of 

 the tentacular stems is not described by Selenka, who on the 

 other hand states that the main stems are 5 or 6 in number. 



In one specimen — that from Aomori — there are four fixing 

 muscles to the intestine, two on each side of the nerve-cord. 

 On either side, one muscle is attached to the œsophagus near 

 the posterior extremity of the dorsal vessel and the other to the first 

 intestinal spiral ; both arise from the body-wall close to each other, 

 far in front of the roots of the retractor muscles and widely separated 

 from the ventral nerve-cord. In the other specimen — that from 

 Wakkanai — one of the fixing muscles of the left side is wanting, 

 the single muscle present on that side dividing into two short 

 branches (Fig. 91). Both of the latter are attached to the first 

 spiral of the intestinal convolution (one to the œsophageal^ and 

 the other to the rectal, section of the intestine. Close to the 

 entrance to the convolution, there is present on the rectum a distinct 

 blind diverticulum {rg, Fig. 91), an organ which has not been 

 mentioned by Selenka from Hilgendorf's specimens. The 

 fixins; muscles are stated bv Selenka to be onlv two in number. 



