the echinoid fauna from japan and adjacent regions part i

Explanation of Plate 5
(Size as stated)
Figs. 1-4. Temnopleurus hardwickii (GRAY, 1855). 1, side view of an interambulacrum at the
mid-zone of fossil, x 5 (IGPS colI. cat. no. 22242, from the Narita formation of Chiba
Prefecture) ; 2, side view of an ambulacrum at the mid-zone of the same, x 5; 3, side
view of an interambulacrum at the mid-zone of Recent specimen, x4 (for comparison)
(IGPS colI. cat. no. 78205, from Ojika Peninsula, Miyagi Prefecture); 4, side view of
an ambulacrum at the mid-zone of the same, x4 (for comparison).
Figs. 5-8. Erbechinus gratus NISIY AMA, n. sp. 5, aboral view of holotype, x 2 (IGPS colI. cat.
no. 73720, from the Shirahama (Susaki) formation of Shizuoka Prefecture) ; 6, side view
of the same, x 2; 7, other side view of the same, x 2; 8, oral view of the same, x 2.
Figs. 9-10. OPechinus variabilis (DODERLEIN, 1885). 9, side view of Recent specimen, x3 (for
comparison) (IGPS colI. cat. no. 58317, from off Wada-machi, Chiba Prefecture, in 130-
147 metres); 10, oral view of the same, x3 (for comparison).
Figs. 11-15. Brochopleurus pulcherrimus NISIYAMA, n. sp. 11, oral view of holotype, x 3 (IGPS
colI. cat. no. 73719-1, from the Komayama formation of Chiba Prefecture); 12, aboral
view of the same, x 3; 13, oral view of paratype, x 3 (IGPS colI. cat. no. 73719-2, from
same horizon and locality) ; 14, side view of holotype, x 3; 15, aboral view of other
paratype, x 3 (IGPS colI. cat. no. 73719-3, from same horizon and locality).
Photo by K. KU:VIAGAI