128 TELLINID. 
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 lines 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 branchiz, 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, pomted, pale brown, smooth outwardly, 
and within coarsely pectinated transversely, not having the 
furrow as in those of 7. donacina. Foot flat, sharp-edged, 
slightly geniculated, linguiform, lanceolate at the pomt 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. mvcaRNnata, Linneus. 
T. incarnata, Brit. Moll. i. p. 298, pl. 20. f. 5. 
T. paLaustina, Linnzeus. 
T. balaustina, Brit. Moll. i. p. 290, pl. 21. f. 2. 
T. FaBULA, Gronovius. 
T. fabula, Brit. Moll. i. p. 302, pl. 19. f. 9. 
T. proxima, ? Brown. 
T. proxima, Brit. Moll. i. p. 307, pl. 21. f. 1. 
T. BRIMACULATA, Linneeus. 
T. brimaculata, Brit. Moll. 1. p. 309. 
T. VESPERTINA, Chemnitz. 
Psammobia vespertina, Brit. Moll. i. p. 271, pl. 19. f. 1, 2. 
T. costutata, Auctorum et nobis. 
Psammobia costulata, Brit. Moll. i. p. 279, pl. 19. f. 5. 
We are not certain, though we believe most of the above 
belong to this section; but we have doubts on the 7. fabula, 
as the authors of the ‘ British Mollusca’ observe that its 
