762 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



PLATE 19. 

 Proximal brachials of Antedon biflda. (After W. B. Carpenter.) 



Fio. 1098. IBr,, proximal face. 

 1099. Same, distal face. 

 1100. Same, ventral face. 

 1101. Same, dorsal face. 

 1102. IBr, (axillary), distal face. 

 1103. Same, proximal face. 

 1104. Same, ventral face. 

 1105. Same, dorsal face. 



1106. First brachial of the free undivided arm, proximal face. 

 1107. Same, distal face. 

 1108. Same, dorsal face. 

 1109. Same, ventral face. 



PLATE 20. 

 Proximal brachials of Antedon biflda. (After W. B. Carpenter.) 



Fro. 1110. Fifth brachial, distal face. 

 1111. Same, proximal face. 

 1112. Same, pinnule socket. 

 1113. Same, ventral face. 

 1114. Same, dorsal face. 



1115. Brachial from about the middle of the arm, proximal face. 

 1116. Same, distal face. 

 1117. Same, lateral view. 

 1118. Radial, articular face. 

 1119. IBr 3 (axillary) of pentaerinold at time of detachment from larvnl column, external 



view. 



11 LH). Same, internal view. 



1121. IBr, of pentacrlnold at time of detachment from larval column, internal view. 

 1122. Same, external view. 



PLATE 21. 

 Proximal bracttials of Comanthvs parvirirra. (After P. II. Carpenter.) 



Fin. 1123. IBr,. distal face. 



1124. Same, proximal face. 



1125. Same, ventral surface. 



1126. Same, dorsal surface. 



1127. IBr,. (first axillary) proximal face. 



1128. Same, distal face. 



1129. Same, ventral surface. 



1130. Same, dorsal surface. 



ll.'il. IBr, of another variety, distal face. 



11 ''2. Same, proximal face. 



1133. Same, ventral surface. 



1 1.".4.- Same, dorsal surface. 



1135. IBr, (first axillary) of another variety, proximal face. 



1130. Same, disfail face. 



1137. Same, ventral surface. 



113S. Same, dorsal surface. 



