118 ME. P. II. CAEPENTEll OX THE GENUS ACTINOMETKA. 



Plate II. 



Fig. 1. Diagram of the distributiou of the ambulacra in a new Actinometra from the Philippines. 



2. Superior or ventral aspect of the disk oi Act. pnlymorpha, var. 2, the oral pinnules having been 



cut away near their bases, x 3. 



3. Piece of an ordinary teutaculiferous arm of Act. pobjmorpha, from about the middle of its 



length, seen from above, x 4. 



4. Terminal portion of the same arm. x 4. 



5. Piece of the middle portion of a non-tentaculiferous arm, borne upon the same axillary as that 



represented in ligs. 3&4. Ventral view, x 4. 



6. Termination of the same arm. x 4. 



7. Disticlial, palmar, and lower brachial segments of one of the radii of Act. pobjmorpha, var. 4, 



showing the white line which occupies the middle of the dorsal surface of the skeleton, x 4, 



8. Ccntrodorsal piece aiul one radius of a monstrous specimen of Act. pohjinorp/ia, showing the very 



irregular form of the ccntrodorsal piece {cd) and the imperfect condition of one of the 

 palmar series, which consists simply of one axillary segment bearing brachials upon one of 

 its distal faces, and two suprapalmars {spi,sp.a) upon the other, x 4. 



9. Diagram of the calyx of a small thirtcen-armed specimen of ^c<.7w/y««o?y>/ia : Type, x 4. 



10. A similar diagram of a larger specimen with 26 arms, x 3. 



11. A similar diagram of a specimen of var. 3, with 39 arms, x 2. 



The * in these three figures (9, 10, 11) indicates the position of the mouth on the ventral side of the 

 disk relatively to the radial skeleton of the dorsal side. 



Plate III. 



Fig. 1. Terminal comb of an oral pinnule of Act. pectinata. x 20. 



2. Oral pinnule of Act. pohjmorpha, Type, x 10. 



3. Oral pinnule of Act. polijinorpha, ^'ar. 1. x 10. 



4. Portion of a horizontal section through the synostosis of two first radials of Pentacnnus Wyville- 



Tkomsoni. x 110. 



5. Lower portion of a vertical section through the peripheral cud of the synostosis of two first radials 



of Act. polymorpfia. x 110. 



6. Lower portion of a similar section, taken rather nearer the centre of the radial pentagon, showing 



the disposition of the fibres which effect the synostosis of the first radials with the ccntrodoi-sal 

 piece, both in the radial (/) and the intcrradial planes {Si, S.^, S3). X 110. 



7. Longitudinal section througli one of the muscles (i.mj and interartieular ligaments (Zj) con- 



necting the second and third brachials. X 110. 

 8-10. Cirrhi of Act. poly morplia. Type, and vars, 1 & 2. 



8. Type, x G. «, adult ; Z», very young ; c, nearly mature. 



9. Isolated cirrhus-segments of the Type. X 40. a, a basal segment; b, a terminal segment. 



10. Cirrhus of var. 2. X 6. 



11. Cirrhus of var. 1. x G. 



Plate IV. 



Figs. 1-8 of Ant. celtica. All x 7. 

 Figs. 1 & 2. Ccntrodorsal piece, after removal of the cirrhi, as seen from its dorsal (fig. 1) and ventral 

 (fig. 2) sides. 

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



