the echinoid fauna from japan and adjacent regions part i

Explanation of Plate 18
(Size as stated)
Figs. 1, 4. Allaster rotundus NISI Y AI\IA, n. sp. 1, aboral view of holotype, x 2 (IGPS colI. cat.
no. 73768-1, from the Takinouye formation of Hidaka Province, Hokkaido); 4, aboral
view of paralype, x 2 (IGPS colI. cat. no. 73768-2, from same horizon and locality).
Figs. 2, 5, 9. Hemiasier uU'ajimensis MORISHITA, 1962. 2, aboral view of hypotype, x 2 (IGPS
colI. cat. no. 73747, from the Miyakura (Furushiroyama) formation of Ehime Prefecture) ;
5, oral view of the same, x 2; 9, side view of the same, x 2.
Figs. 3, 12-13. Paraheleraster macroholcus (NISIY A?>.IA, 1950). 3, aboral view of h%type, xl
(IGPS colI. cat. no. 72981, from the Arita formation of Wakayama Prefecture) ; 12, side
view of the same, xl; 13, anterior view of the same, x 1.
Figs. 6-7. Cardias/er perorientalis NISIYAMA, n. sp. 6, aboral view of holotype, xl (IGPS colI.
cat. no. 72981, from the Miyakura (Furushiroyama) formation of Ehime Prefecture);
12, side view of the same, xL
Fig. 8. Echinarachnius d. parma obesus H.L. CLARK, 1914. Oral view of fossil specimen in
figure 4 on plate 16, xl (IGPS coll. cat. no. 30663, from the Paromai formation
(Echinarachnius·zone) of the River Paromai, North Sakhalin).
Figs. 10-11. Cottreaucorys (Cordastrum) sulcatus NISIYAMA, n. sp. 10, aboral view of holo/ype,
x 2 (IGPS colI. cat. 73746, from the Miyakura (Furushiroyama) formation of Ehime
Prefecture) ; 11, oral view of the same, x 2.
Photo by K. KUMAGAI