NOTES ON THE CEPHAPOPOPA. 



3 6 3 



unilaterally on the ventral side of the arm, there exis's an in- 

 dentation, which is proximally bounded by a firm prominence 

 of the arm on the side referred to. Suckers occur on the arm 

 in a series from the base to the angular shaped swelling. 

 They are smaller, more numerous and more closely set than 

 in other arms. Numbering twenty-seven in all, the fourth 

 and the fifth suckers are the largest. For other points in 

 the manner of the'r arrangement, the reader is referred to 

 the figures. 



Of the internal anatomy I can give only such scanty notes 

 as could be taken by making incisions without much impair- 

 ing the specimen. The liver presents the notable feature 

 that its posterior parts project caudad and ventrad into the 

 median mantle connective, which serves as a delicate sheath 

 to those parts of the organ. The posterior end of liver is of 



F ig. 2. 



Terminal part the form of a rounded cone. From the apex of this emerges 



of the hecto- 



cotylized arm, the ink-duct, which then proceeds straight to the anus. The 



X 3 /f. 



penis has a striking resemblance to that of Poly/us. It is of 

 a retort-like shape, about 9 mm. long and situated on the left side of the 

 visceral sac, the elongate part being directed cephalad. Needham's sac 

 joins the penis at the neck-like part of the diverticle by means of a narrow 



passage. 



The measurements of the specimen are as follows : 



Total length 135 mm. 



Breadth of body 40 ,, 



Depth of body 45 ,, 



End of body to mantle margin 45 ,, 



End of bod) to the middle point between eyes 50 ,, 



End of body to mouth 60 ,, 



End of body to funnel extremity 72 ,, 



End of body to umbrella edge between ventral arms 95 ,, 



End of body to umbrella edge between dorsal arms 95 ,, 



