DON AX. ERVILIA. 123 



extended, but at rest, or half exserted, it is puckered and 

 transversely ridged. There are a pair of light brown suboval 

 branchiae 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 littoral 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. POLITUS, Poli. 



D. politus, Brit. Moll. i. p. 336, pi. 21. f. 7. 

 D. complanatus, Auctorum. 



ERVILIA, Turton. 



E. CASTANEA, Montagu. 



E. castanea, Brit. Moll. i. p. 341, pi. 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, 



in 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. 



TELLINIDJE. 



The British TeUinida are distributed in four genera, 

 Tellina, Scrobicularia, Syndosmya, and Lacinopsis ; their 



