AND RELATED GENERA, SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 71 



mp., 



muscles' pennon. 



nd., 



enido-glandular tract of the filament. 



pbm., 



parieto-basilar muscles. 



pm., 



parietal part of the longitudinal muscles. 



psb,, 



pseudo-basilar muscles. 



rm., 



radiated muscles of the disc. 



sp., 



spirocysts. 



t, 



tentacles. 



Figs. 1-4, Synhalcurias elegans ; 5-9, Porponia antarctica; 10. Halcurias carlgreni. 



Fig. 1. Transverse section through the body-wall with a part of two mesenteries. £.* 



Fig. 2. Vertical section through the body-wall. Only a part of the mesoglcea is designed. J with out- 

 drawn tube. 



Fig. 3. Transverse section of the mesoglcea and muscles of the disc. §. 



Fig. 4. The basal part of a mesenterium with the longitudinal muscles and the pseudo-basilar muscles. 

 Schematic. 



Fig. 5. Cross-section through one tentacle above the middle. ^. 



Fig. 6. Cross-section through the same on the basis §. 



Fig. 7. Cross-section through a not-directive mesenterium. The same section as in fig. 8. The whole 

 breadth of the mesoglcea is not drawn. §• 



Fig. 8. Cross-section through a part of a directive mesenterium and the body-wall in the region of th e 

 aboral end of the stomatodseum. £. 



Fig. 9. Transverse section of the ciliated tract region of the filament, -jy. 



Fig. 10. Section through the upper part of the body to show the arrangement of the mesenteries. Twice 

 magnified. 



* Magnifications refer to Reichert's system, " Austria." Figures drawn in the level of the micro- 

 scope's foot. 



