Scientia Sinica

EXPLANATION. OF PLATE II

Palzostrophia recta Wang (sp. TYCO eee eee eae ae p. 167 1: Exfoliated ventral valve showing pallial marks, % 2, syntype, I.P.A.S. 8007; 2: exterior of imperfect ventral valve showing sulcus, X 2, syntype, LP.A.S, 8005; 3: exterior of imperfect dorsal valve showing broad and short fold, X 2, syntype, 1.P.A.S. 8006.

Upper Cambrian; a small hill behind Tsingshantsum Village, west of Chiawang- Colliery,

Kiangsu Province. : Mimella formosu Wiane (Spy Ove) pierre ole ee ets cee ent oe p. 163 Iey2s 3a: Respectively, ventral, dorsal, posterior and lateral views of complete specimen, 1.5, hoiotype, I.P.A.S, 7999; 5: interior of ventral valve showing highly elevated adductor tracks, X 1.5, paratype, I.P.A.S. 8000; 6: interior of dorsal valve showing brachiophores, ‘cardinal process and deeply impressed muscle area, 1.5, syntype, I1.P.A.S, 8001: 7,8: ventral and dorsal views of well preserved internal mold showing ovarian impressions and pallial trunks, % 1.5, syntype, I.P.A.S. 8002. :

Neichia Series, Middle Ordovician; Pankuchai, west of Tangtishuya Village, north of Ichang District, Hupeh Province; half a mile east of Yingwushi, Ssunan District, Kweichow Province. Martellia ichangensis Wang (sp. TO ee ee nee eee ena oe ee p. 165 1,25 33 45D? Respectively, ventral, dorsal, lateral, posterior and anterior views of mature individual showing ornamentation and faint sulcus and fold, X 2, holotype, I.P.A.S. 8003.

Neichia Series, Middle Ordovician; about one mile west of Tangtishuya and Fenhsiang Villages, north of Ichang District, Hupeh Province.

?Hemupronites hupeihensis Wang (sp. MOV) a Ais oe cei oe = eres Se eee ne eee p. 166 1,2,3: Ventral, dorsal and lateral views of complete specimen, X 1, holotype, I.P.A.S. 8004; 4: same, portion of exterior enlarged to show small pits along the radiating interspaces, X 2.5.

Neichia Series, Middle Ordovician; Pankuchai, one mile west of Tangtishuya Village, Ichang

District, Hupeh Province.