Page:Quarterly Journal of the Geological Society of London, vol. 27.djvu/164

 Pecten Quinquecostatus, Sow.

Very numerous in this locality, resembling in every respect the specimen from Pondicherry in Mr. Forbes's Collection in the Geological Society's Museum.

Number of specimens obtained by me, 11.

Locality. umtamfuna river, bed e.

Pecten amapondensis, nov. sp. Pl. III. fig. 7.

The right valve very slightly concave, finely striated concentrically, with broader radial ribs. Towards the end of the valve, two distinct concentric lines, which divide the surface of the valve into two or three areas.

Locality. umtamfuna river, bed e.

Arcade.

Arca capensis, nov. sp. Pl. III. fig. 10.

The valves very thick, surface nearly smooth, very slightly cancellated, margins smooth. Hinge-teeth numerous, the lateral ones very strong. The ligamental area with numerous but very narrow grooves ; for the cartilage is much smaller than in Arca natalensis, and the interior umbones nearly touch each other in closed valves. Area trichinopolitensis, Forbes, is very nearly allied to this species. Mr. Baily's figure of Area umzambaniensis does not suffice to enable me to decide positively whether the present species is distinct from it ; but it seems to me that Mr. Baily's figure represents a much flatter specimen than mine.

Number of specimens 9.

Locality. umtamfuna river, bed e.

Pectunculus africanus, nov. sp. Pl. III. fig. 8.

A small bivalve ; length about from 1/2-3/4 of an inch. Surface finely radiately striated, showing lines of growth ; margins denticulated ; hinge semicircular, teeth transverse ; ligamental area very small. This species is most nearly related to P. subauriculatus from Pondicherry (see Mr. Kaye's Collection) ; but the latter is more circular in form than P. africanus.

Number of specimens collected, 41.

Locality. Umtamfuna river, bed e.

TRIGONIADAE.

Trigonia Shepstonei, nov. spec. PI. III. fig. 11.

This species stands between Trigonia crenulata and scabra, Lamk. The surface shows strong lines of growth, with thick transverse ribs, which run quite straight from the beak to the margin, and form right angles with the ventral margin. The ribs have very pro-