128 TELLTNKLE. 



the tubes. The siphons are moderately long, disunited, taper- 

 ing and divergent; the anal one is the longest and most 

 slender, curving upwards with exceedingly minute cirrhi at 

 the extremity, of frosted white, and eight intenser longitudinal 

 fine Hues running from base to point ; the branchial siphon is 

 also frosted white, having six short cirrhi at the orifice, and 

 intermediate shorter ones. There are a pair of pale brown 

 suboval branchiae, which hang obliquely; the upper very 

 small, lapping on the much larger lower ones almost verti- 

 cally ; they are on both sides coarsely striated, the larger by 

 only eight vessels of the circulation, separated from each 

 other by as many fine lines. The pairs of palpi are rather 

 long, subtriangular, pointed, pale brown, smooth outwardly, 

 and within coarsely pectinated transversely, not having the 

 furrow as in those of T. donacina. Foot flat, sharp-edged, 

 slightly gemculated, linguiform, lanceolate at the point and 

 pure white. 



These animals are dredged in abundance at Exmouth, in a 

 six-mile offing. 



The following species have not been met with alive. 



T. INCABNATA, Liniiseus. 

 T. incarnata, Brit. Moll. i. p. 298, pi. 20. f. 5. 



T. BALAUSTINA, LilinffiUS. 



T. balaustina, Brit. Moll. i. p. 290, pi. 21. f. 2. 



T. FABULA, GronoAius. 

 T.fabula, Brit. Moll. i. p. 302, pi. 1.9. f. 9. 



T. PROXIMA, ? Brown. 

 T.proxima, Brit. Moll. i. p. 307, pi. 21. f. 1. 



T. BRIMACULATA, Linnseus. 

 T. brimaculata, Brit. Moll. i. p. 309. 



T. VESPERTINA, Chemnitz. 

 Psammobia vespertina, Brit. Moll. i. p. 271, pi. 19. f. 1, 2. 



T. COSTULATA, Auctorum et nobis. 

 Psammobia costulata, Brit. Moll. i. p. 279, pi. 19. f. 5. 



We are not certain, though we believe most of the above 

 belong to this section ; but we have doubts on the T.fabula, 

 as the authors of the ' British Mollusca ' observe that its 



