91 
Ligptuggts eo 
WaraséHa—vercoi, n. sp., Blochmann. Pl. xxvii., figs. 1 to 5. 
Shell small, in outline of a slender pear shape, higher 
than wide, remarkably thickwalled, light to dark dull coral-red, 
with a conspicuous finger-shaped hinge process. The greatest 
width is somewhat in front of the centre. Beak stout, 
rather strongly bent dorsalwards, and then obliquely trun- 
cate, with a moderately large hole. Its sides are rounded, 
and towards the deltidial plate are finished off in a sharp 
edge. Deltidial plates large, joining together widely. 
Lateral edge of the ventral valve in the neighbourhood of 
the teeth raised dorsally in a low point, further forwards 
curving ventrally. Front edge distinctly convex dorsally. 
Both valves are nearly equally deep. The accremental 
strie are in both quite distinct. To the square millimetre 
there are about 216 pores, the inner diameter of which 
amounts to 20. Their outer opening is oval, and measures 
25-30 » by 35-40». Both valves are in their hinder part 
very massive. The thickness of the ventral valve at the beak 
amounts to about 06 mm. This circumstance, together with 
the somewhat thickened and in many examples distinctly 
contracted edge, shows with certainty that it has reached a 
full-grown stage. The colour is a dull lighter or darker 
coral-red. 
The dorsal valve bears conspicuous tooth sockets, the 
free wall of which posteriorly projects over the hinge in a 
triangle. In front of the hinge lies a blunt finger-like hinge 
process. Under this, looking from the inner side, 7.¢., also 
dorsal, appears a hinge-plate, depressed in a furrow-like man- 
ner in the middle. The hollow space generally existing 
between the hinge-plate and the wall of the valve is filled up. 
To the hinge-plate is joined on a stout median septum, reach- 
ing ag far as the middle or even somewhat further forwards. 
Its free edge is strongly curved from before backwards, corre- 
sponding to the curve of the valve. The brachial apparatus 
begins with short crura, which bear wide triangular incon- 
spicuous crural processes. The descending limbs reach the 
median septum widening towards the front, and descending 
ventrally unite widely with this, run a short distance back- 
wards towards the hinge, and are then united by a bridge 
somewhat variable in width and position. The brachial appa- 
ratus is: colourless, or very pale-red. The anterior portion 
of this is in its general form somewhat variable. 
Dim.—The size of the largest example before me and 
of another is: — 
Length, 75 mm. and 65 mm. 
Breadth, 4°00 mm. and 3°77 mm. 
Thickness, 4°8 mm. and. 4°4 mm. 
