Nr. 1] ANATOMICAL STUDIES ON AXELASMA AND SCALPELLUM 27 



Fig. 10. Epithelium from the digestive gland of a fullgrown 

 specimen [X 460]. Rabl. Weigerts haematoxyline— iron 

 ammonium sulphate, van Giesson. 



» 11. Transverse section of a lilament of a young specimen at 

 some distance from the peduncle [X 320]. Rabl. Wei- 

 gert's haematoxyline— iron ammonium sulphate, van 

 Giesson. 



» 12. Transverse section of a filament of the same specimen 

 at its distal end, surrounded by the sharks tissue [X 320J. 

 Rabl. Weigerts haematoxyline — iron ammonium sul- 

 phate, van Giesson. 



Plate III. 

 Ahelasma squalicola. 

 Fig. 13. From a transverse section of the mantle of a quite 

 young specimen. c = cementary gland cell [X 460]. Rabl. 

 Weigerts haematoxyline — iron ammonium sulphate, 

 van Giesson. 

 » 14. Transverse section of a cementary gland cell of a full- 

 grown specimen [X 320]. Rabl. Weigert's haematoxyline 

 — iron ammonium sulphate, van Giesson. 

 » 15. Section of a cementary gland cell of a fullgrown specimen 

 showing the duct in longitudinal section. [X 320]. Rabl. 

 Weigert's haematoxyline — iron ammonium sulphate, 

 van Giesson. 



Scalpellum Strømii. 

 » 16. Section through the end part of a cementary gland [X 460]. 

 Bouin. Delafields haematoxyline, eosine. 



Plate IV. 



Scalpellum Strømii. 

 Fig. 17. Longitudinal section of the oesophagal wall. c.p.= con- 

 nective parts between the cuticle (c), and the dilatatory 

 muscles (d. m.); r. m. = ring muscle [X 460]. Bouin. 

 Delafields haematoxyline, eosine. 



» 18. Longitudinal section of the alimentary canal showing 

 the transition from the stomach (s) to the digestive intest- 

 ine (i) [X 320]. Bouin. Delafield's haematoxyline, van 

 Giesson. 



» 19. Section of the «salivary gland» [X 460]. Bouin. Wei- 

 gerts haematoxyline — iron ammonium sulphate. 



» 20. Epithelium of the digestive gland; resting phase [X 460]. 

 Bouin. Delafields haematoxyline, eosine. 



