ME. P. H. CAEPENTER ON THE GENUS ACTINOMETEA . 119 



Fig. 5. Interior of the calyx, as seen after removal of the visceral mass. 



6. Lateral view of the base of the cah'x with the centrodorsal piece in situ. 



7. Pentagonal base of the calyx of a smaller variety, as seen from its dorsal side. 



8. Lateral view of the base of the calyx of the same variety, with the centrodorsal piece in situ. 



Figs. 9-11 of Ant. Eschrichtii. 



Fig. 9. Two united first radials, together with tlie portion of the rosette which is in connexion with 

 them, as seen from within, x 7. 



10. Pentagonal base of the calyx as seen from its dorsal side after removal of the rosette occu.- 



pying its central cavity, x 3^. 



11. Centrodorsal piece seen from its ventral side. x 3|^. 



Figs. 12-17 of Ant. rosacea, all x 7, except fig. 13, which is x 15. 



Fig. 12. Isolated first radial, a. ventral, b. dorsal, c. internal aspect. 



13. Abnormally developed rosette, with two spout-like interradial processes (o) and a basal bridge 



{b.b.) connecting the ends of two of the radial processes [jA- -^ 1^- *'• ventral, b. dorsal 

 aspect. 



14. Lateral view of the base of the calyx with the centrodorsal piece in situ. 



15. Centrodorsal piece seen from its ventral side. 



16 & 17. Pentagonal base of the calyx as seen from its dorsal (fig. 16) and ventral (fig. 17) sides. 



Plate V. 



The figui-es all x 7, except fig. S, which is x 15. 



Figs. 1—4 of Act. Solaris. 



Figs. 1 & 2. Centrodorsal piece as seen from its dorsal (fig. 1) and ventral (fig. 2) sides. 



3 & 4. Pentagonal base of the calyx as seen from its dorsal (fig. 3) and ventral (fig. 4) sides. 



Figs. 5-9 of Act. pectinata. 



Fig. 5. Interior of the calyx as seen after removal of the visceral mass. 



6 k,7. Centrodorsal piece as seen from its dorsal (fig. 6) and ventral (fig. 7) sides. 



8. An isolated compound basal, x 15. a. ventral, b. dorsal aspect. 



9. An isolated first radial, a. ventral, b. dorsal, c. internal aspect. 



Figs. 10-15 of Act. robusta. 



Fig. 10. Internal aspect of an isolated first radial. 



11-13. Two united first radials, together with those portions of the rosette which are in con- 

 nexion with them, as seen from above (fig. 11), below (fig. 12), and within (fig. 13). 

 In these four figures (10-13) I. indicates a bristle passed along the axial radial canal ; II. another 

 passed along the axial interradial canal ; and III. a third, entering the central canal by oue of the aper- 

 tures on the internal face (a.'), and coming out through the aperture of the commissural canal {co.c.) on 

 the lateral face. 

 Figs. 14 & 15. Centrodorsal piece as seen from its dorsal (fig. 15) and ventral (fig. 14) sides. 



Plate VI. 



All these figures are x 7, except figs. 6, 18, 19, 22, which are all x 15. 



Figs. 1-11 of Act. polymorpha, Type. Figs. 1-6, from one specimen. 



Fig. 1. Lateral view of the base of the calyx, with the centrodorsal piece in situ. 

 2. The same parts seen from the dorsal side. 



