164 
pink at the umbones, variegated with interrupted angular bands of 
brightish red. 
Prcren ve.utinus, Thes. Conch. pl. 138. f.31. Pect. T. subovali, 
.subcompressd, equilaterali, radiatim leviter striatd, ad marginem 
subinflatd ; auriculis subequalibus, striatis, margine oblique pli- 
cato; costis 5, crassis, rotundatis, gradatim declinantibus ; colore 
fulvo-rufescente, fasciis albis, angulatis, subtis fusco-marginatis 
variegato ; intis albo. Long. 1:15; lat. 0°37; alt. 1°25 poll. 
Hab. Macassar. Hinds legit. . 
Nearly oval, rather flat, equilateral, with fine radiating striz ; auri- 
cles nearly equal, striated; hinge obliquely plicated; ribs five, 
rounded, not very deep; colour dull fawn, variegated with angular 
bands of white edged with brown lines. The whole surface of the 
shell has a somewhat velvety appearance. 
Pecren serRATUS, Thes. Conch. pl. 13. f.56. Pect. T. oblique 
ovali, irregulari, postice subproductd, subcompressd ; auriculis in- 
e@qualibus, posticis minoribus, costis numerosis, minutissime squa- 
- miferis ; colore sulphureo, maculis magnis fuscis variegato, intits 
ad marginem purpureo. Long. 1°20; lat. 0°50; alt. 1°40 poll. 
Hab. ad Insulas Philippinas. H. Cuming legit. Found under 
stones at low water on the island of Zebu. 
Resembling P. sguamosus, but more oblique and more ventricose, 
with the scales more minute. 
PrecTEN ALBOLINEATUS, Thes. Conch. pl. 14. f.69. Pect. T. ovali 
subtrigond, compressd, equivalvi ; auriculis inequalibus, posticis 
minimis, anticis magnis, acutis, sulcatis ; costis numerosis, equa- 
libus, subquadratis ; interstitiis griseo-maculatis, valve sinistre 
costis griseis, lineis albis interruptis, costarum tribus albis. Long. 
0°93; lat. 0°25; alt. 1:19 poll. 
Hab. Ins. Guimaras, Philippinarum. Found under stones at low 
water. ; 
Resembling P. ornatus, Lam., but with the ribs more numerous, 
equal and regular. 
Pecren sincarorinus, Thes. Conch. pl. 13. f. 151, et pl. 18. f. 71. 
Pect. T. rotundatd, subtrigond, subcompressd, equivalvi, subequi- 
laterali, subtenut ; auriculis inequalibus ; anticis magnis ; costis 24 
elevatis, subquadratis, levibus ; colore albo, pallidé roseo tincto, 
radiis quatuor latis, fusco-maculatis ; prope umbones griseo macu- 
Tato. Long. 1°30; lat. 0°40; alt. 1°30 poll. 
Hab. Singapore. Found in coarse sand at the depth of six fathoms. 
_ More depressed spreading and circular than P. Tranquebaricus. 
PrEcTEN crassicostatus, Thes. Conch. pl. 15. f. 111. pl. 17. f. 152. 
Pect. T. subtriangulari, crassd, subequilaterali, sublevi ; auriculis 
inequalibus, costas squamiferas ferentibus ; costis 24, crassis, 
elevatis, subquadratis, annulatis ; lateralibus squamiferis ; inter- 
stitiis fere levibus, colore pallide purpureo, vel aurantiaco. Long. 
4:50; lat. 1°50; alt. 4°30 poll. 
