250 HELICINA $. 5. 6. 
Helicina, parvula. Harper Pease in Amer. journ. conch. IV. 1868. p. 156. 
1p mt (a 
— Pütel Catal. 125: 
"Hato d in insula Atiu. Polynesiae. 
4s. H. hicincta Gloyne. 1 
I. subeonoideo-depressa, tenuis, striis incrementi tenu- 
issimis, oculo fudo haud conspicuis, costulis spiralibus paulo 
fortoribus, supra modice distantibus, subtus confertissimis 
decussata, supra sulphurea (apice excepto) translucens, cingulis 
duobus saturate aurantiacis pulcherrime ornata, subtus Haadus 
alba, zona infra carinam, IE callo medioeri pallide citrinis; 
anfr. 5, planiusculi, rapide accrescentes, ultimus acute carina- 
tus, subtus modice convexus; apertura obliqua, semiovali- 
subtriangularis, intus saturate citrina; peristoma acutum, colu- 
mella verticali cum margine basali angulum formante. — Operc.? 
— Diam. maj. 183, min. 11, alt. 9 mill. (G.) 
Helicina, bicineta. Gloyne in Journ. Conch. XX. 1872. p. 47. 
Habitat in regione Amazonica superiore (Janson). 
49. H. tectiformis Mousson. 1 
I. conico-depressa, acutissime carinata, fortiter oblique 
.striata, lineis numerosis, elevatis decussata, flavo- seu griseo- 
albescens. Spira depresse convexo-conica; summo subpromi- 
nulo, flavo-corneo; sutura plana, lineari, vix perspicua. Anfr. 5 
subeeleriter accrescentes, fere plani, spiraliter lineis 6— 8 ele- 
vatis inaequaliter lirati, ultimus. carina. lamellosa, deorsum 
producta praeditus, ad basin planiusculus, medio convexior, 
secundum carinam impressus, spiraliter indistincte lineatus. 
A pert. perobliqua (55? cum axi), transverse triangularis. Perist. 
extus acutum, intus labiatum; margine dextro supra recto, ad 
insertionem in carinam perprotracto, basali breviter reflexo, 
intus, praecipue versus angulum carinae, incrassato; columellari 
brevi, ENOT laminam parietalem, tenuem, circularem emit- 
tente. — Alt. 8, diam. 12,5 mill. — Rat. anfr. 7:3. — Rat. 
appro: po (M.) 
Helicina tectiformis Mouss. in Journ. Conch. XVIII. 1870. p. 199. t. 
bou CE 
— — (Trochatella) Brazier in Proc. Zool. Soc. 1871. p. 322. 
— — Pütel Catal. p. 126. 
