OF CONCHOLOGY. 287 



Of the same character as T. fastigiatus, Ad,, and Cumingii, 



Ad. 



Trochus conoidalis, Pease. Plate 24, fig. 8. 



Description. — T. acuto-conica, anguste perforata ; anfr. plano- 

 declivibus, transversim sulcatis, longitudinaliter plicato-corruga- 

 tis, inferne ad marginem plicato-squamatis ; basi plano-convexa, 

 tenuiter sulcata ; albida, luteo aut purpureo tincta. 



Dimensions. — Alt. 5, diam. 4 mill. 



Locality. — Paumotus. 



Shell sharply conical, narroAvly perforate ; whorls flatly slop- 

 ing, transversely grooved, plicately wrinkled longitudinally and 

 plicately scaled at the margin ; base flatly convex, finely grooved ; 

 whitish, stained with saff'ron-yellow or purple. 



Trochus marmoreus. Pease. Plate 24, fig. 9. 



Description. — T. acuto-conica, solida, crassa, anguste perfo- 

 rata, transversim regulariter sulcata ; anfr. planulatis aut sub-- 

 convexis ; anfr. ultimo ad basim angulato ; basi convexa, circu- 

 lariter sulcata et striata ; labro intus lirato ; columella truncata ; 

 rubro alboque marmorata. 



Dimensions. — Alt. 8, diam. 5 mill. 



Locality. — Paumotus. 



Shell sharply conical, solid, thick, narrowly perforate, trans- 

 versely regularly grooved throughout ; whorls plane or slightly 

 convex ; last whorl angulate at base ; base convex, circularly 

 grooved and finely striate ; lip lirate within ; columella truncate 

 at base ; marbled with white and rose color. 



Of very doubtful generic characters. 



Operculatum aurantium. Pease. 



Description. — T. ovata, solida, depresso-convexa, latere dextro 

 rotundato-convexo, latere sinistro plano-convexo, supra concen- 

 trice teuui striata, radiatim obsolete et late costata, subtus costis 

 parvis radiatim rugulosa ; supra alba, epidermide raembranacea 

 induta, subtus medio castaneo-fusca, impressione musculari ful- 

 vescente fascia castanea concentrice marginata, extus fulves- 

 cente. 



Dimensions. — Long. 5 J, diam. 4 inches. 

 Locality. — Hawaii. 



Shell ovate, solid, depressly convex, right side roundly con- 

 vex, left side flatly convex, upper side concentrically finely 



