Proceedings of the American Association for the Advancement of Science, Volume 29

abactinal actinal ambulacral American ancient animals antennæ appearance Association Boston centre character chieftains clay Coleoptera color Committee contains coronal plates diagram disease Echini Echinoderms eggs elytra embryology endocranium entomology extended F. W. Putnam fact feet fish fossil genera gens geological glacier heat hemisphere ice-cap ice-field igneous rock inches increase insects Institute Island of Montreal kame Lake larva larvæ latitude light lower Mass maxillæ mean meeting melting miles modifications moth mounds Museum nearly northern northern hemisphere observed organs ovipositor paper pass polar poriferous zone portion President probably Prodoxus Prof Professor Pronuba yuccasella region ridges river rocks sandstone scientific shell shown side Silurian Society solar intensity species specimens spiral stages structure surface Tacitus temperature tion trace trees tribe tubercles upper valve vapor young Yucca Yucca Moth