PLETJROTOMA.— Plate XXX. 



turreted, whorls longitudinally many-ribbed, ribs 

 narrow, prominent, fulvous. 

 Reeve, Pro. Zool. Soc, 1845. 



Hob. ? 



The interstices between the ribs are closely excavated 

 to their base on each side. 



Species 272. (Mus. Cuming.) 

 Pletjrotoma cantharis. Flew, testa oltuso-ovatd, 

 crassd, solidd, lamgafd, (infractions medio oblique no- 

 doso-plicatis ; dm sulamplo; nigricante-fuscd, nodis 



albidis. 

 The beetle Pletjrotoma. Shell obtusely ovate, thick, 



solid, smooth, whorls oblique, nodosely plicated round 



the middle ; sinus rather large ; very dark brown, 



nodules whitish. 

 Reeve, Pro. Zool. Soc, 1845. 

 Hob. Sibonga, Island of Zebu, Philippines (found under 



stones at low water); Cuming. 

 A dull stout, dark, chocolate-brown shell reminding one 

 of a little black-beetle. 



Species 273. (Mus. Cuming.) 



Pletjrotoma vultuosa. Pleur. testa ovatd, mfractiius 

 subrotundis, longUudimliter obtuse costatis, transvemm 

 creberrbm liratis ; lairo intus denticulato, sum amplo, 

 lato ■ albicante, apicepallide rosaceo. 



The frowning Pletjrotoma. Shell ovate, whorls some- 

 what round, longitudinally obtusely ribbed, trans- 

 versely very closely ridged ; lip denticulated within, 

 sinus large, broad ; whitish, apex tinged with pink. 



Reeve, Pro. Zool. Soc, 1845. 



Hab. Baclayon, Island of Bohol, Philippines (found under 



stones); Cuming. 

 Sometimes encircled round the base of the last whorl 

 with a broad brown band. 



Species 274 (Mus. Cuming.) 



Pletjrotoma opalus. Pleur. testa oblongo-ovatd, penta- 

 gonali, crassd, laevigata, longitudinaliter costatd, costis 

 oblique continuis, mbnodosk, angustis, quasi vellicatis, 

 intent itiis plano-concavis ; aperturd parvd, tinu amplo, 

 prof undo ; ebumed, nitente, costarnm interstitiis incar- 

 nato-fuscescentibus. 



The opal Pletjrotoma. Shell oblong-ovate, five-sided, 

 thick, smooth, longitudinally ribbed, ribs obliquely 

 continuous one under the other, slightly nodose, nar- 

 row, as if pinched, interstices between the ribs, flatly 

 concave ; aperture small, sinus large, deep ; ivory 

 white, shining, interstices between the ribs fleshy 

 brown. 



Reeve, Pro. Zool. Soc, 1845. 



Hal. Cagayan, Produce of Misamis, Island of Mindanao, 

 Philippines (found in sandy mud at the depth of 

 twenty-five fathom) ; Cuming. 

 An extremely interesting five-angled pagoda-like shell, 



stout in the middle, and rising pentangularly to a sharp 



apex. 



Species 275. (Mus Cuming.) 



Pleurotoma ebue. Pleur. testa oblongo-ovatd, pentago-^ 

 nali crassd, spird acuminata, longitudinaliter continue 

 costatd, tramversim striatd, striis basem, versus compi- 

 cuis ; sinu amplo, proftndo ; ebumed. 



The ivory Pleurotoma. Shell oblong-ovate, five sided, 

 thick spire acuminated, longitudinally ribbed, ribs 

 obliquely continuous one under the other, transversly 

 striated, stria? conspicuous towards the base ; smus 

 large, deep ; ivory white. 



Reeve, Pro. Zool. Soc, 1845. 



Resembling the preceding, but striated, and more opaque. 



