Scientia Sinica

No.1 WANG: NEW SPECIES OF BRACHIOPODS [I] 171

minute, incurved; fold moderately high, short, appearing about at the middle of the valve. :

Dimensions (mm): Length 18.5; width 18.5; thickness 11.4. Holotype, I.P.A.S. 8013.

Horizon and locality: Lojoping Series, Middle Silurian; Changshengkou, Chahuaping Village, Fengkang District, Kweichow Province.

Collector: The author.

Discussion: In regard to its surface ornamentation, this specimen is erroneously identified with Anastrophia by the author in his previous work. A careful study of some serial sections leads the author to believe that this specimen may belong to the genus Camarotoechia. It has no ventral spondylium and has a median septum in the dorsal valve.

This species resembles Camarotoechia bieniaszi Kozlowski!) in general outline but has a larger size and strong surface plications.

Genus Paurorhyncha Cooper 1942 Paurorhyncha squamosa Wang (sp. nov.) (BID LVS Ds Figss 15)

Shell large; much wider than long, transversely sub-oval to subrectangular in outline; hinge-line narrow, equal to about half the width of the shell; cardinal extremities and lateral margins broadly rounded; anterior commissure strongly uniplicate; lateral profile subequally biconvex, the dorsal valve having a little more convexity; lateral commissures flexed ventrally. Surface ornamented by even, subrounded plications, except the sides of the sulcus and fold.

Ventral valve moderately convex, highest around the middle, curving rapidly anteroward and gradually to the cardinal and lateral margins; sulcus wide, with flat bottom, originating about from middle of the valve ; tongue subquadrate, extending far beyond the anterior commissure; beak obtuse, slightly incurved.

Dorsal valve strongly convex, with the greatest convexity a little posterior to the middle; anterior profile strongly convex, posterior slope steep; fold moderately high, top flat, lateral sides abrupt, originating about in the vicinity of the middle of the valve, anterior end truncated; umbo broadly swollen; beak incurved and concealed by the ventral beak.

Dimensions (mm): Length 33.2; width 42.6; thickness 25.6; hinge-width 21.3.

Holotype, LP.A.S. 8014.