764 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. 



Plate 27. 



Adanibulacral deposits of various comatuHds. 



Fig. 1166. — Aglaometra incerta, apparently from a dried specimen. (After P. H. Carpenter.) 



1167. — Charitometra hasicuvva, lateral view of |X)rtion of pinnule mounted in dammar 



(After P. H. Carpenter.) 

 1168. — Pachylomctra inwgxialis, lateral view of portion of a pinnule, apparently dried. 



(After P. H. Carpenter.) 

 1169. — Pcecilonwtra accela, lateral view of portion of a pinnule, apiwirenOy dried, (.\fter P. 



H. Carpenter.) 

 1170. — Eathrometra proUxa, lateral view of portion of arm of pentacrinoid at time of flrst 



appearance of pinnules and cirri, with tentacles omitted. (After Mortensen.) 

 1171.- — Thalassometra agassizii, lateral view of jiortion of pinnule, showing slieleton only. 



(After Hartlaub.) 

 1172.— Same. (After Hartlaub.) 

 1173. — Antedon bifida, lateral view of growing arm of young i^entiicrinoid. ( .\ftt>r Wyville 



Thomson. ) 

 1174. — Hathrometra sai'sU, portion of arm of ijentacrinoid witli six brachials di'veloiKM.). 



(After M. Sars.) 



Pla.1T. 28. 

 Eggs and larvm of certain com<itiiIids. 



Fio. 1175. — Portion of arm of specimen of Comanthus parvicirra, showing eggs attached to bases 



of pinnulea (After P. H. Carpenter.) 

 1176. — Antedon bifida, young embryo seen through vitelline membrane. (After Wyville 



Thomson. ) 

 1177.— Same. (After Wyville Thomson.) 

 1178.— Same. (After Wyville Thomson.) 

 1179. — Antedon bifida, embryo. (After Wyville Thomson.) 

 1180. — Antedon bifida, dorsal view of embryo shortly after rupture of vitelline membrane. 



(After Wyville Thomson.) 

 1181. — Anted07i bifida, ventral view of a slightly older embryo. (After Wyville Thomson.) 

 1182. — Antedon 7nediterranea, surface view of larva of fifth day, still in vitelline membrane, 



showing the yellow cells. (After Bury.) 

 1183. — Antedon 7ncditerranea, surface view of free larva of sixth day, from right side. 



(After Bury.) 

 1184. — Anted-o-n mediterranea, surface view of larva of seventh day, from left side, (.\fter 



Bury.) 

 1185. — Antedon mediterranea, surface view of larva early on eighth day, from ventral side. 



(After Bury.) 



Plate 29. 



Larvce of Antedon. 



Fio. 1186. — Antedon bifida, ventral view of embryo shortly iHjfore disjippearauce of ciliated 



bauds. (After Wyville Thomson.) 

 1187. — Lateral view of same. (After Wyville Thom.sou.) 

 1188. — Dorsal view of same. (After Wyville Thomson.) 

 1189. — Antedon bifida, dorsal view of embryo not long after rupture of vitelline membrane. 



(After Wyville Thomson.) 

 1190. — Antedon mediterranea, diagram showing arrangement of skeletal plates in larva of 



seventh day. (After Bury.) 



