Transitional beds of the Ordovician and Silurian of the Altai Sayan province and Tyan Shan. Cystoidea and crinoids. Rossiiskaya Akademiya Nauk Sibirskoe Otdelenie Trudy Instituta Geologii i Geofiziki, 397 1978: 145-172. 160 [Zoological Record Volume 115]