132 TROCHOMORPHA. 



receding; columellar lip strongly arcuate and a little calloused 

 within. Alt. 6, diain. 13 mill. 



Aura Island, New Hebrides. 



T. convexa HTM., Proc. Acad. Nat. Sci. Phila. 1889, p. 93, t. 5, f. 7, 

 My description and figures 20, 21, 22, are drawn from the type 

 specimen in the collection of the Academy of Natural Sciences. 

 Another specimen, figs. 23, 24, 25, differs in being higher (alt. 71, 

 diam. 12 mill.), in having the umbilicus narrower, and in being 

 somewhat lighter colored, showing more distinctly the narrow, pale- 

 brown bands at suture and above and below the carina. This speci- 

 men is in the collection of Dr. Hartman. 



T. PLANOCONUS Mousson. PI. 47, figs. 4, 5, 6, 



Shell umbilicated, trochiform, rather solid, scarcely shining, 

 rugosely striated ; striae rude, irregular, oblique ; color chestnut- 

 black, variegated with fulvous, gradually passing into dark chest- 

 nut-brown ; apex obtuse ; base dark honey-yellow, with a darker 

 line near the keel ; spire elevated, conoid, with planulate outlines ; 

 suture linear, narrowly margined ; whorls 7, slightly convex, slowly 

 and regularly increasing, last one acutely carinated ; keel com- 

 pressed and rugose; umbilicus small, deep; aperture diagonal, sub- 

 rhomboidal-luniform ; peristome above the keel acute and gently 

 arched, below the keel thickened and concave. (Garrett.) 



Alt. 10, diam. 19 mill. (Garretf). 



Alt. 11, diam. 18 mill, (specimen). 



Ono Inland, Viti Archipelago. 



Tr. planoconus Mouss., MS., Mus. Godeffroy 1885. GARRETT, 

 P. Z.S., 1887, p. 175. 



Distinguished from other similarly maculated species by its con- 

 ical spire and flat base, the acute light-edged keel being rather bent 

 downward. The umbilicus is deep and tubular, one-ninth the 

 diameter of the base. The color is a cjear, oily chestnut-brown 

 below, with an obscure dark line bordering the keel ; above it is 

 black, becoming reddish and then yellow toward the corneous apex ; 

 the entire upper surface, except several earlier whorls, is maculated 

 irregularly with creamy patches. The specimen described and fig- 

 ured is from the collection of Mr. John Ponsonby, of London. 



T. MERZIANOIDES Garrett. Vol. IX, pi. 7, figs. 4, 5, 6. 



The large size of this species, its honey-yellow base, chestnut- 

 brown upper surface, which is mottled with radiating lines and 



