436 MOLLUSCA. DONACID.E. TelUna. 
Length half an inch, breadth a little more, with two red spots under the 
beaks, or with interrupted sagittate rays. 
485. T. squcdida. — Oval-oblong ; produced and pointed re- 
trally ; in one valve two teeth, and a single lateral one ; in the 
other a single tooth and two lateral ones. 
Pult, Dorset. 29. — Mont. Test. Brit. 56.— T. depressa, Dora. Brit. Shells, 
t. clxiii. — Turt. Biv.-Brit. 105 — English and Irish coasts. 
Length about an inch, breadth nearly two inches ; colour reddish ; eoneen- 
trically striated, with irregular ridges of growth. 
** With two teeth in each valve, and the shell ovak 
486. T. .sfHa^«.-^Oval-triangular, with crowded transverse 
striae, and minute longitudinal ones ; each valve with two lateral 
teeth. 
Mmt Test. Brit. ,60. t. xxvii. f. 2.~^Turt. Biv. Brit. 106 Southern 
shores of England, rare. 
Length an inchi breadth three quarters ; rosy-white, with fine and regular 
concentric striae. 
487. T. tenuis. — Oval-triangular; irregularly striate trans- 
versely ; one of the valves with a lateral tooth. 
T. levis. List. Conch, t. ccccv. f. 251. — T. planata, Penn. Brit. .Zool. iv. 
87. t. xlviii. f. 29. — T. tenuis, Don. Brit. Shells, t. xix. f. 2 Mont. Test. 
Brit. lix. — Turt. Biv. Brit. 107.— Sandy shores, common. 
Length about half an inch, breadth three quarters ; reddish, with generally 
deeper bands ; compressed, somewhat truncated, and angular at the 
anal extremity; 
*** In each valve two teeth, and the shell somewhat orbicular^ 
488. T. maculata. — Suborbicular, and equivalve, with rough 
transverse striae, and minute longitudinal ones, each valve with 
two lateral teeth. 
Tm't. Biv. Brit. 108.— Ban try Bay. 
Length an inch, breadth an inch and quarter ; whitish, with dark irregular 
spots ; the interstices of the distinct concentric striae are longitudinally stria- 
ted, which gives a roughness to the aspect of the shell. — This is probably 
identical with T^ obtusa of Sowerby, Min. Conch, t. clxxix. fi 4, a reputed 
crag fossil. 
489. T. erassa. — Suborbicular, unequivalve, nearly equilate- 
ral, with transverse striae, and obscure longitudinal ones ; the 
left valve with a remote lateral tooth on each side. 
Pectunculus planus. List. Conch, t. 299.— T. erassa, Penn. Brit. Zool. iv. 
87. t. xlviii. f. 28 — ^T. proficua, Pult. Dorset. 29. Mont. Test. Brit. 
69. T. reticulata, Maton and RacTeett, Linn. Trans, viii. 54. t. i. f. 9. 
T. fausta, Pult. Dorset. 29. Mont. Test. Brit. 64. Dm. Brit. Shells, 
t. xcviii. rigida, ib. t. ciii — Southern shores of England and Irelana, 
rare in Scotland. 
Length from 1 to 2 inches, and a little more in breadth ; strong, semitrans- 
parent, whitish, tinged with yellow, or rayed longitudinally with pink ; left 
