TRUNCATELLA $. 5. 19 
55. scalariformis Reeve. (Coll. 28.) Aur. 191. Pneum. II. 8. III. 7. — 
Taheitia. scalariformis Pease in Journ. Conch. XIX. 1871. p. 92; 
Proe. Zool. Soc. 1871. p. 468. — Martens & Langk. Don. Bismark. 
p. 69. t. 4. f. 1. — Ins. Annaa, Taheiti. 
56. Tr. arctecostata Mousson. 1 
,I. rimmata, cylindraceo-turrita, subdiaphana, tenuiuscula, 
multieostata, (38 per anfr.), interstitiis costas aequantibus, luteo- 
alba. Spira decollata; sutura impressa. Anfr. 4—95 superstites, 
supra magis, infra minus convexi; ultimus ovato-rotundatus, 
infra attenuatus, ad rimam appressus. Apertura verticalis, 
t/, altitudinis aequans, oblique late ovata, biangulosa. Perist. 
tenuiter incrassatum, obtusiuseulum; margine dextro expanso, 
subeffuso, infra antrorsum paulo producto; basali ad columellam 
subangulatim adjuncto; columellari et parietali subsoluto-cras- 
siusculis, breviter reflexis. —  Altit. 6, diam. 2,5 mill. Rat. 
anfr. (:2. Rat. apert. 4:3.* (M) 
Truncatella. arctecostata. Mouss. in Journ. Conch. XVII. 1869. p. 68. t. 5. 
f. 4. (in tab. acutecostata.) 
— — Pátel Catal. p. 117. 
Habitat im insulis ,,Paumotou* dictis (Garrett). 
Obs. Species — 77unc. scalariformis Reeve. (Pease in Journ. Conch. 
1871. p. 92; Proc. Zool. Soc. 1871. p. 468.) 
57. Tr. Wallacei H. Adams. 1 
,I. elongata, subulata, tenuis, decollata, albida, clathris 
acutis undulatis confertissime instructa; anfr. superst. 8, con- 
vexiusculi, ultimus penultimo late sejunctus; apertura rotundato- 
lunaris; perist. continuum, subinerassatum, undique reflexius- 
eulum, extrorsum expansum. — Long. 18, lat. 4 mill.; ap. 
diam. 3 mill.* (A.) 
Truncatella. Wallace ("Taheitia) H. Adams in Proc. Zool. Soc. 1865. p. 
416. t^9Y^ £ 18/04 
Habitat in insula. Waigiou. 
58. Tr. clathrata A. Adams & Angas. 1 
»l. t. elongata, subcylindrieca, tenui, decollata, pallido- 
fulva, clathris acutis irregularibus subdistantibus instructa; 
anfr. superst. (, convexiusculi, ultimus penultimo sejunctus; 
apertura subovalis; perist. continuum, undique reflexum, mar- 
gine dextro expanso. — Long. 9, diam. 3 mill, ap. diam. 
3 mill.* (A.) 
2 * 
