14 
This shell somewhat resembles 7. balthica in form, but is 
distinguished by the thinness of its substance, and narrowness 
of the hinge line, as well as by the delicate texture and 
iridescence of its surface. The specimens are destitute of 
colour bands, but have mostly the remains of a light brown 
epidermis about the margin. 
TELLINA (MACOMA) ORDINARIA, n.sp. (Plate VII., fig. 7). 
Shell obliquely oval, inequilateral, compressed, thin, sordid 
white, with a thin greenish periostracum, concentrically 
very finely striated, posterior side obscurely angled. Posterior 
dorsal margin short, convexly sloping ; anterior longer, 
oblique, slightly convex ; lateral and ventral margins rounded. 
Umbones small, rather acute, scarcely incurved, situated 
rather posteriorly ; cardinal area very narrow and indistinct, 
with a thin ligament. Interior smooth, suffused with yellow ; 
hinge line very narrow, with two small cardinal teeth in each 
valve, and no lateral teeth. 
Measurement :—Anterior to posterior, 16; umbones to 
ventral margin, 13; thickness (valves united), 6} millim. 
Hab. :—Saldanha Bay, 10 fathoms. 
A shell of ordinary appearance, very thin in substance, 
with a yellow interior. 
TELLINA (MacoMA) AFRICANA, n.sp. (Plate VII., fig. 8). 
Shell oblong-oval, oblique, very inequilateral, compressed, 
white, very thin in substance, nearly smooth, concentrically 
very obscurely striated, with impressed growth lines towards 
the margin; posterior side obscurely angled, truncated ; 
anterior somewhat produced. Posterior dorsal margin short, 
rather straight, sloping, obtusely angled; anterior long, 
oblique, very slightly convex ; posterior lateral margin short, 
nearly vertical, obtusely angled above and below; anterior 
rounded; ventral margin arcuate. Umbones small, rather 
acute, erect, situated rather near the posterior end of the 
shell. Interior smooth, but showing growth lines, white, 
faintly tinged with light buff; hinge line very narrow, with 
small cardinal teeth, no laterals. 
Measurement :—Anterior to posterior, 17}; umbones to 
ventral margin, 12; thickness (valves united), 6 millim. 
Hab. :—Algoa Bay, 16 fathoms. 
TELLINA (MACOMA) INCLINATA, n.sp. (Plate VII., fig. 9). 
Shell transversely oblong, slightly oblique, inequilateral, 
compressed, of a rather thin substance, dull white, with a very 
thin light brown periostracum, concentrically irregularly 
striated, and marked with growth lines; posterior side rather 
