3o8 Southcyji Cross. 



oe tcsophagus. 



oe. ill oesophageal mvjiL;iDal ion. 



uo ovary. 



p, I, III parieto-basilar muscle. 



,s siplionoglyph. 



V verruca?. 



;/ food yolk. 



i., II., 111., i\' cycles of mciicuterics or tentacles. 



Plate XLVIII. 

 Urticina sulcata. 



Fig. 1. — Reproduction from photograiih of young female specimen (natural size), 

 showing invagination constriction and well-marked sulcation of body-wall above it. 



Fig. 2. — Transverse section of the sphincter muscle. 



Fig. 3. — Transverse section of one of the tentacles. 



Fig. 4. — Longitudinal section of a portion of the body-wall. 



Fig. 5. — Transverse section of mesentery near aboral end, showing the longi- 

 tudinal and parieto-basilar muscles. 



Plate XLIX. 

 Urticina carlgreni. 



Fig. 6. — Pieproduction from photograph (natui'al size) showing foreign bodies 

 still adherent to verrucas. 



Fig. 7. — Transverse section of sphincter muscle. 



Fig. 8. — Diagrammatic figure illustrating the arrangements of the cycles of 

 tentacles in relation with the intra- and inter- mesenteric spaces. Although tire 

 tentacles are somewhat larger according to age, the difference in the diameter as 

 represented by the circles in the drawing is exaggerated. (The same arrangement 

 as here depicted pertains in U. sulcata also.) 



P'ig. 9. — Longitudinal section of a portion of the body-wall. 



Fig. 10. — Transverse section of a fertile mesentery. 



Plate L. 

 Brood Chambers and Emhryos. 



Fig. 11. — Longitudinal or vertical section of body-wall of a specimen of U. carlgreni 

 ])assing through a brood chamber in an early stage of invagination and quite empty. 



Fig. 12. — Longitudinal or vertical section through the body-wall of a specimen 

 of U. carJ(jreui passing through the opening to a brood chamber of an older stage 

 than Fig. 11, containing a developing embryo and closed to the outside. 



Fig. 13. — Similar section through the specimen of U. sulcata, figured (Fig. 1) with 

 brood chamber of a little earlier stage to Fig. 12. 



Plate LI. 

 Brood Chambers and Embryos. 



Fig. 14. — Transverse or horizontal section of the same specimen as Fig. 12 

 ( U. carlgreni), passing through about the middle of the brood chamber. 



Fig. 15. — Similar section of the same individual, passing through the brood 

 chamber near its lower end, showing the prolongation of lobes of the chamber into 

 the mesenteric spaces. 



