MONOGRAPH OF THE EXISTING CRINOIDS. 



77 



CompouTid interpolated arm division. — Ann division in which all the division series 

 arc 2, these two ossicles representing externally a tnio division series, but 

 internally the first two ossicles of a free undivided arm, as in ComateUa and 

 Neocomatella (sec fig. 78, p. 131). 



Fio. «. 



Fig. 44. 



Figs. 41-14. — 41, Lateral view of the centrodorsal and arm bases or a specimen of Poktiometra insperatcs from the 

 Philippine Islands, illustrating a species with well-separated rays and nmsioN series. 43, Ventral view of 



THE CALYX AND AR.M BASES OF A SPECIMEN OF TONTIOMETRA IXSPERATUS FROM THE PHTLIPPINE ISLANDS, ILLUSTRATING A 

 SPECIES WITH WELL-SEPARATED RAYS AND DmsiON SERIES. 43, LATERAL VIEW OF THE CENTRODORSAL AND ARM BASES OF 

 A YOUNG SPECIMEN OF ASTEROMETRA MIRIFICA FRO.M THE Kl ISLANDS, ENTIRE (a), AND \nTn ONE POSTRADIAL SERIES 

 REMOVED (6), ILLUSTRATING A .SPECIES WITH CLOSELY APPRESSED OR "WALL-SIDED" RAYS AND DIVISION SERIES. 44, VE.NTRAL 

 VIEW OF THE ARM BASES OF A YOUNG SPECIMEN OF .\STEROMETRA SHRIFICA FROM THE Kl ISLANDS, ILLUSTRATING A SPECIES 

 WITH CLOSELY APPRESSED OR "WALL-SIDED" ARM BASES. 



Coronal plates. — The plates which primarily form a ring about the apical area; 

 these arc 10 in number and in the cruioids are arranged hi 2 circlets, the 

 first, abutting upon or concealed by the column, consisting of 5 small plates 

 (infrabasals) which are radial in position, the second, immediatel}- beyond 

 the first, consisting of 5 larger plates (basals) wliich alternate with those of 

 the first anil are therefore interradial in position. 



