DONAX. ERVILIA. 123 
extended, but at rest, or half exserted, it is puckered and 
transversely ridged. There are a pair of light brown suboval 
branchiz on each side, the upper ones being less and shorter 
than the lower, hung more obliquely, and scarcely visibly 
pectinated on either side ; the palpi are rather long, triangular, 
pale yellow, smooth exteriorly, and well striated on the inner 
areas. The liver is a pale brown-green. The stylet and 
attritor are well developed. The ovarium varies in colour 
from white or yellow to bright red; it is anterior and under 
the liver. The rectum, after a convolution or two, passes 
through the dorsal region, embraced by the heart and white 
linear auricles, to the anal tube. 
These beautiful shells are plentifully found with the live 
animal at Exmouth, and in the lttoral and laminarian zones 
of the Warren sands, between that place and Dawlish. 
We have not met with the D. politus alive or dead on the 
western coasts ;—we refer to it— 
D. pourrus, Poli. 
D. politus, Brit. Moll. i. p. 336, pl. 21. f. 7. 
D. complanatus, Auctorwn. 
ERVILIA, Turton. 
EK. castanea, Montagu. 
E. castanea, Brit. Moll. i. p. 341, pl. 31. f. 5, 6. 
All that can be said of this animal is, that it has not been 
observed, though we believe it has been taken alive on the 
Irish coasts by Mr. Barlee, who favoured us with a small 
fresh specimen. We trust that indefatigable naturalist will, 
im an excursion he contemplates again to explore the sea-beds 
of the Emerald Isle, make us acquainted with the external 
organs of this interesting species. 
TELLINIDA. 
The British Vellinide are distributed in four genera, 
Tellina, Scrobicularia, Syndosmya, and Lucinopsis; their 
