The Actiuiae of the Plate Collection. 303 



Explanatiou of Plates. 



ac acrorliagus m margin 



col column Me mesentery 



D and B' directive mesenteries ph physa 



(/ disc rs ring sinus 



i foreigu inclusions sp sphincter 



L lips st stomatodaeum 



M Mouth t tentacle. 



Plate 14. 



Fig. 1. Hnliantlms chileiisis n. sp. 3 : 2. 



Fig. 2. Longitudinal section through the proximal part of the column 

 of //. chilensis, showing the introverted physa. 



Fig. 3 — 5. Transverse sections through the column of H. chilensis 



Fig. 6. Gi/rostoma selkirkü n. sp. 1:1. 



Fig. 7. Transverse section through the margin of G. selkirkü. 



Fig. 8. Transverse section through the column of G. selkirkü. 



Fig. 9. Trausverse section of a mesentery of the first cycle of G. 

 selkirkü, below the level of the stomatodaeum. 



Fig. 10 — 11. Gyrostoma i»rertu))t n. sp. 1 : 1. 



Fig. 12. Transverse section through a portion of the column wall 

 with mesenteries below the level of the stomatodaeum ; G. incertum. 



Plate 15. 



Fig. 13. Transverse section of a mesentery of the first cycle of G. 

 incertum ; the section is taken below the level of the stomatodaeum. 

 Fig. 14. Section of the basilar muscles of G. incertum. 



