118 ME. P. H. CAEPENTEE OX THE GENUS ACTINOMETEA. 



Plate II. 



Fig. 1. Diagram of the distribution of the ambulacra in a new Actlnometra from the Philippines. 



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



cut away near their bases, x 3. 



3. Piece of an ordinary tentaculiferous arm of Act. polymorpha, from about the middle of its 



length, seen from above, x 4. 



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



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



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

 G. Termination of the same arm. x 4. 



7. Distichal, palmar, and lower brachial segments of one of the radii of Act. polymorpha, var. 4, 



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



8. CeDtrodorsal piece and one radius of a monstrous specimen of Act. polymorpha, showing the very 



irregular form of the centrodorsal 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 [sp u sp.a) upon the other, x 4. 



9. Diagram of the calyx of a small thirteen-armed specimen of Act. polymorpha : Type, x 4. 



10. A similar diagram of a larger specimen with 2G arms. x 3. 



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



The * in these three figures ('.), 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. polymorpha, Type, x 10. 



3. Oral pinnule of Act. polymorpha, Var. 4. x 10. 



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



Thomsoni. x 110. 



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



of Act. polymorpha. 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 centrodorsal 

 piece, both in the radial (/) and the interradial planes [S it S 2 , S 3 ). x 110. 



7. Longitudinal section through one of the muscles (b.m._) and interarticular ligaments (L^ con- 



necting the second and third brachials, x 110. 

 8-10. Cirrhi of Act. polymorpha. Type, and vara. 1 & 2. 



8. Type, x G. a, adult; b, very young; c, nearly mature. 



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



10. Cirrhus of var. 2. X 6. 



11. Cirrhus of Tar. 1. x 6. 



Plate IV. 



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

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

 (fig. 2) sides. 

 3 & 4. Pentagonal bass of the calys, as seen from its dorsal (fig. 3) and ventral (fig. 4) sides. 



