250 
HELICINA §. 5. 6. 
Helicina parvula Harper Pease in Amer. journ. conch. IY. 1868. p. 156. ! 
t. 12. f. 10. 
— — Patel Catal. p. 125. 
Habitat in insula Atiu Polynesiae. 
§. 6. 
48 . H. bicincta Gloyne. f 
„T. subconoideo-depressa, tenuis^ striis incrementi tenu- 
issimis, oculo nudo hand conspicuis, costulis spiralibus paulo 
fortioribus, supra modice distantibus, subtus confertissimis 
decussata, supra sulphurea (apice excepto) translucens, cingulis 
duobus saturate aurantiacis pulcherrime ornata, subtus flavido- 
alba, zona infra carinam, et callo mediocri 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 verticalicum margine basali angulum formante. — Operc.? 
— Diam. maj. 13, min. 11, alt. 9 mill.“ (G.) 
Helicina bicincta Gloyne in Journ. Conch. XX. 1872. p. 47. 
Habitat in regione Amazonica superiore (Janson). 
49. H. tectiformis Mousson. f 
„T. 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, 
subceleriter 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. 
Apert, perobliqua (55° cum axi), transverse triangularis. Perist. 
extus acutum, intus labiatum; margine dextro supra recto, ad 
insertionem in carinam perprotracto, basali bre viter reflexo, 
intus, praecipue versus angulum carinae, incrassato; columellari 
brevi, verticali, laminam parietalem, tenuem, circularem emit- 
tente. — Alt. 8, diam. 12,5 mill. — Rat. anfr. 7:3. — Rat. 
apert. 1:1.“ (M.) 
Helicina tectiformis Mouss. in Journ. Conch. XVIII. 1870. p. 199. t. 
8. f. 7. 
— — (Trochatella) Brazier in Proc. Zool. Soc. 1871. p. 322. 
— — Patel Catal. p. 126. 
