AND RELATED GENERA, SCOTTISH NATIONAL ANTARCTIC EXPEDITION. 263 



mp., muscles' pennon. 



nd., enido-glandulai tract of the filament. 



p/n/1., parieto-basilar muscles. 



pm., parietal part of the longitudinal muscles. 



psb., paeudo-basilar muscles. 



rm., radiated muscles of the disc. 



fp., spirocysts. 



t., tentacles. 



Figs. 1-4, Synhalcurias elegans ; 5-9, Porponia antarctica ', 10. flalcurias carlijreni. 



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 mesoglcoa is designed. $- with out- 

 drawn tube. 



Fig. 3. Transverse section of ihe mesoghca and muscles of the disc. ?.. 



Fig. 4. The basal part of a inesenterium 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, f 



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 stomatodaeum. ^. 



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



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. 



(ROY. soc. EDIX. TRANS., VOL. u, 71.) 



