50 K. MITSUKUm AND S. IKEDA. 



We wish to express our thanks to Dr. Divers and to Messrs. 

 Namiye, Nagahira and Tsuchida for vaUiable aid and assistance. 

 Zoological Institute, 



Science College, Tokyo 



Feb. 20, 1895. 



PLATE X. 



Fig. 1. Entire animal. ^. 



Fig. "2. Shell or Pen. i. 



Fig. 3. Club of the tentacular arm. ^. 



Fig. 4. Part of a sessile arm, to show suckers, and the menbrane at 

 the edges of the sucker-bearing face. 4- 



Fig. 5. Pows of Teeth from the odontophore. a from the anterior 

 part, b from the posterior part. 



Fig. 6. a Upper Mandible, b Lower mandible. 



Fig. 7. Horny rings from suckers on the club of the tentacular 

 arm. a, a from the large suckers in the two middle rows, b, b' from 

 the small suckers in outermost rows. -|. 



Fig. 8. Horny rings from suckers on the basal portion of the first 

 three pairs of the sessile arms. |. 



Fig. 9. Horny rings from suckers on the middle third of the first 

 three pairs and on the proximal half of the fourth (ventral) pair. -|. 



Fig. 10. Horny rings from suckers on the distal third of the first 

 three pairs and on the distal half of the fourth arm. \. 



IjJ*! 



