40 



clathrata ; clathris elevatis, rectis, numero ad 40 in singulis an- 

 fractibus : spira anfr. 5 convexis : apcrtura obliqua, ovata ; 

 peristomate albo, continuo, reflexo. Long. T ^, lat. ^ poll. 

 Hab. Mangsi Island, Borneo. 



Its principal characters are its large size, very convex whorls, 

 and very numerous bars. T. Caribbaorum, Sowb. is often of 

 the same color, but is more robust, the whorls less convex and 

 the bars less numerous and less elevated. 



Truncatella Vitiana. Testa decollata, conico-cylindracea, 

 solidula, flavido-cinerea ; spira anfr. superstitibus 4-5 planiuscu- 

 lis, costulis subrectis, elevatis, obtusis ad 30 clathratis : apertura 

 obliqua, rotundato-elliptica ; peristomate expanso, continuo, an- 

 fractui penultimo haud adnato, costa marginato quae postice ad 

 suturam producta est; operculum laminatum. Long. -^j, lat. 

 y 1 ^ poll. Hab. Feejee Islands. 



One of the largest species, though it varies greatly in size. 

 It is especially distinguished by the peculiar mode in which the 

 lip forms its junction posteriorly. The bars also become fused 

 posteriorly, so that the intervening flutings do not always reach 

 the suture. It differs from T. aurantia in color, is more solid, 

 and the bars are less numerous. 



Truncatella porrecta. Testa parva, elongata, sub-cylin- 

 drica, decollata, albida ; spira anfr. superstitibus 4 convexis, 

 clathris humilibus acutis ad 16 instructis, ad intervallos minutis- 

 sime et longitudinaliter striatis : apertura rotundato-lunata, an- 

 fractui penultimo late sejuncta; peristomate continuo, extrorsum 

 expanso : operculum laminis arrectis radiantibus eccentricis 

 ornatum. Lat. ±\, alt. T poll. Hab. Taheiti. 



The distinguishing marks are, its slender form, unusually 

 convex whorls, and the protrusion of the last whorl. 



Truncatella rostrata. Testa parva, conico-cylindracea, 

 nitida, decollata, incarnata, oblique clathrata ; clathris ad 12 

 robustis : spira anfr. 5 convexiusculis : apertura parva, oblique 

 ovata; peristomate continuo, crasso, albido, duplici, reflexo. 

 Lat. &, alt. ¥ V poll. Hab. Rio Janeiro. 



In size and color it is much like T. Cumingiana, Adams, 

 which is still smaller, has only 8 bars, which are whitish, more 

 elevated and acute. The secondary lip gives the base of the 

 shell, when viewed in profile, a rostrated appearance. 



