the echinoid fauna from japan and adjacent regions part i

Explanation of Plate 17
(Size as stated)
Fig. 1. Echinodiscus transiens NISIY AMA, n. sp. Aboral view of holotype, xl (IGPS call. cat.
no. 73773, from the Yamaga formation of Hiko-shima, Yamaguchi Prefecture).
Figs. 2, 3, 6. Pseudoastrodapsis nitidiusculus NISIY AM A, n. sp. 2, aboral view of paratype, xl
(IGPS colI. cat. no. 73805-2, from the upper Neogene formation of central Hokkaido) ; 3,
oral view of other paratype, xl (IGPS colI. cat. no. 73805-3, from same horizon and
locality) ; 6, side view of paratype, xl (IGPS colI. cat. no. 73805-2).
Fig. 4. Astriclypeus mannii VERRILL, 1867. Aboral view of fossil (IGPS colI. cat. no. 8315,
from the Ryukyu Limestone of Okinawa Island, Ryukyu Islands), x 1.
Fig. 5. Allastel' rotundus NISIY MIA n. sp. Side view of holotype, x 2 (IGPS colI. cat. no.
73768-1, from the Takinouye formation of Hidaka Province, Hokkaido).
Photo by K. KUMAGAI