2.? 



EINAR LÖNNBERG: NOTES < >N SPIRULA RETICULATA OWEN 



119 



Fig. 8. 



Fig. 9- 



Fig. 10. 



Fig. ii. 



Explanation of the figures. 



Plate VII. 



Spirilla reticulata Owen, ventral aspect, natural size. 

 The same, dorsal aspect, nat. size. 

 The same, lateral aspect, nat. size. 

 Aboral end of the same, enlarged. 

 Oral disk of the same, nat. size. 



Tentacular club of the same, enlarged, /. "protective membrane". 



Ventral view of the same, enlarged, showing the structure of the shell (a) and the "reticula- 

 tion" of the surface of the mantle {!>). 

 Tangential section of the mantle showing the fibrous tissue round the pits of the surL 



■I obj. 



Hartnack. 



Surface of a shell of Spirilla caught 31" N. lat. 76" \V. long., enlarged, and showing a structure 



different to that of Spirilla reticulata OWEN. 



Side view of a sucker from the arms of Spirilla reticulata OWEN showing "horny armature 



■y oc 



and muscles; pb . Hartnack. 



The same kind of sucker seen from above showing the structure of the "horny" cup; 



=-—- Hartnack. 



2 oc. 

 Muscles from the interior layers of the mantle of Spirilla reticulata Owen jv- jm ul - Hartnack. 



2 OC. 



Subcutaneous muscles of the same with myoblasts in different stages; ^ im j-j- Hartnack. 



2 oc. 

 Capillary vessels of the same; a, free cellules, one with 2 nuclei; \ L,i. obj. IIartnac * c - 



Nuclei from the interior of the lenticular body of the terminal papilla; ij'i 10m |jj Hartnack 

 "Hemichondroid tissue" from the lip of the aboral fossa; n hom- ^ Hartnack. 

 Gelatinous tissue of the terminal papilla outside the lenticular body; u hom ^7 Hartnack. 



