A treatise on zoology . eek & Worthen (1868), Carboniferous, N. America, should perhaps come here. IchtJnju- crinus, Conrad (1842), Silurian, N. America and Europe, has no anals ; arms abut all round and interlock by edges of Br (Fig. CVIIL). Family 2. (jAZAcuinidae. Impinnata (?) with a single large iBr in each interradius, the posterior (anal) resting on truncate edge of large post. B ; arms isotomous ; tegmen of 5 0 of Cyathocrinoid tyj^e, surrounding a peristome which is covered by fused proximal Amb, and supporting Amb along their edges ; food-grooves fork on the tegmen (Fig. CIX.). j,.,^
A treatise on zoology . eek & Worthen (1868), Carboniferous, N. America, should perhaps come here. IchtJnju- crinus, Conrad (1842), Silurian, N. America and Europe, has no anals ; arms abut all round and interlock by edges of Br (Fig. CVIIL). Family 2. (jAZAcuinidae. Impinnata (?) with a single large iBr in each interradius, the posterior (anal) resting on truncate edge of large post. B ; arms isotomous ; tegmen of 5 0 of Cyathocrinoid tyj^e, surrounding a peristome which is covered by fused proximal Amb, and supporting Amb along their edges ; food-grooves fork on the tegmen (Fig. CIX.). j,.,^. (jyiii. Genus — Gazacrinus, S. A. Miller (1892 ; syn. ichthyocrinus piriform^, Idiocrinus, W. & Six), Silurian, N. America, is •:;i>Ki>tiy restored from Brit. , ^ ^ ^ -r^ ., T^. ., Mus. 40-J14. (Nat. size.) referred to the Camerate l^amily Dimerocnnidae by W. & Sp. (1807). Its dorsal cup does not differ essentially from that of Amsocrinus (infra), but the number of IBB is uncertain. The tegmen,.
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
