MONOGRAPH OF THE EXISTING CRINOIDS. 



85 



Extraneous arm division. Arm division resulting from the occasional branching 

 during growth of a linear series of brachials without the loss of the larval arm 

 and without the reduplication of the first two brachials, as contrasted with 

 Interpolated arm division, or arm division resulting from the interpolation of 

 division series, each of which is the exact morphological equivalent of the first 

 two (or four) brachials of the larval arm, between the first (or third) brachial 

 of the larval arm and the base of a new arm which is the exact duplicate of the 

 original larval arm. 



FIG. 60. 



FIGS. 59-00. 59, TlIE TERMINAL COMB ON THE PROXIMAL PINNULES OF A SPECIMEN OF ("OMASTER MULTIBRAOIIAT.V FROM THE 

 PHILIPPINE ISLANDS VIEWED LATERALLY FROM THE OUTSIDE (a), VENTEALLY (&), AND LATERALLY FROM THE INSIDE (c). 60, 



THE TERMINAL COMB ON THE PROXIMAL PINNULES OF A SPECIMEN OF COMANTUUS TRICIIOI'TERA I'KOM SOUTHEASTERN 



AUSTRALIA VIEWED LATERALLY FROM THE OUTSIDE (a), VENTHALLY (6), AND LATERALLY FROM THE INSIDE (c). 



F. 



Finial pinnules. The paired pinnules terminating the posterior ungrooved arms 

 of certain of the Oomasteridae (see fig. 47, p. 81, and pp. 110). 



First brachial (BrJ. Strictly applied, this term refers to the first ossicle beyond 

 the last straight muscular articulation. In most forms the first brachial is 

 the first segment succeeding the last axillary; in Eudiocrinus it is the third 

 postradial segment, and in Vintacrinus the third post-costal segment. 



