MONOGRAPH OF THE EXISTING CKINOIDS. 



81 



FIG. 48. 



Fio. 40. 



Fio. 47. 





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I 



FIG. 49. 



Fio. 50. 



Fio. 52. 



FIG. 51. 



Fio. 53. 



Fia. 54. 



FIG. 55. 



FIGS. 46-55. 46, AN ARM TIP FBOSI A SPECIMEN OF PTEROMETRA TRICHOPODA PROM THE PHILIPPINE ISLANDS, SHOWING THE 

 ABRUPT TERMINATION AND THE INCURVING OF THE TERMINAL BRACII1ALS. 47, THE TIP OF A POSTERIOR ARM OF A SPECIMEN 

 OF COMA TULA PECTTNATA FROM THE PHILIPPINE ISLANDS, SHOWING THE TERMINAL AXILLARY AND THE TWO FINIAL PINNULES. 

 4S, Tip OF A MIDDLE PINNULE OF A YOUNG SPECIMEN OF 1'TILOMETRA UACRONEMA FROM SOUTHWESTERN AUSTRALIA. VIEWED 

 LATERALLY WITH THE DORSAL SIDE DOWN, AND DORSALLT. 49, Tip OF A DISTAL PINNULE OF A SPECIMEN OF A.STERO- 

 METRA ACERBA FROM THE SAHUL BANK, VIEWED LATERALLY WITH THE DORSAL SIDE DOWN (a), AND DORSALLY (6); THE MID- 

 DORSAL CARINATION IS INDICATED BY DOTTED LINES. 50, Tip OF A PINNULE FROM THE MIDDLE OF THE ARM OF A LARGE SPECI- 

 MEN OF COMANTUUS TRICBOPTERA FROM NEW SOUTH WALES, VIEWED LATERALLY WITH THE DORSAL SIDE DOWN. 51, Tip 

 OF A DISTAL PINNULE OF A SPECIMEN OF CoMATELLA STELLIOERA FROM THE INDIAN OCEAN, VIEWED DORSALLY (a), AND 

 LATERALLY (&). 52, Tip OF A DISTAL PINNULE OF A SPECIMEN OF CAPILLASTER MULTIR.VDIAT.V FROM THE PHILIPPINE ISLANDS. 

 VIEWED LATERALLY WITH TIIE DORSAL SIDE DOWN (a), AND DORSALLY (6). 53, LATERAL VIEW OF A DISTAL PINNULE FROM A 

 SPECIMEN OF ASTEROMETRA ACERI1A FROM THE SAHUL BANK, ILLUSTRATING A TRIANGULAR OR PRISMATIC PINNULE. 54, END 

 VIEW OF A SINGLE SEGMENT OF A DISTAL PINNULE FROM A .SPECIMEN OF ASTEROMETRA ACF.RBA FROM THE SAHUL liANK, 

 ILLUSTRATING TIIE CROSS SECTION OF A TRIANGULAR OR PRISMATIC PINNULE. J>.>, LATERAL VIEW OF A PORTION OF A DISTAL 

 PINNULE FROM A SPECIMEN OF PACHYLOMETRA SELENE FROM TIIE PHILIPPINE ISLANDS, SHOWING TIIE SIDE AND COVERING 

 PLATES. 



