166 HELIX S. 48. 
Piülys Aliensis Harper Pease in Crosse Journ. Conch. XVIII. 
1870. p. 394. 
Pilys Aliensis Pease in Proc. Zool. Soc. 1871. p. 453. 
Habitat in insula Atiu. 
Obs. «Species H. modicellae Fér. (ex Desh. tenuissime striatae) pro- 
xima, spira magis elevata, umbilico apertiore et coloribus distinguenda.» 
975. H. architectonica Brazier. | 
«Testa sublate umbilicata, depresso-orbicularis, tenuis, 
vitrea, nitida, regulariter et conferte arcuato-costata, interstitiis 
subtilissime striatis; spira satis elevata, sutura impressa; anfr. 5, 
convexi, ultimus magnus, convexus, antice parum descendens; 
subtus convexus, pariter sculptus ut superne; umbilicus am- 
plus, fundo angustus; apertura fere verticalis, rotundato-lunata ; 
peristoma simplex, tenue, acutum, marginibus approximaltis. — 
Diam. maj. 1!/5, min. 1!/,, alt. ?/, lin.» (B. angl.) 
Helia: archilectonica (Pitys) Braz. in Proc. Zool. Soc. 1871. 
p. 696. 
Habitat prope Hobart Town Tasmaniae (Petterd ). 
Obs. Species affinis H. pexae Cox. 
976. Ef, assimilis Brazier. T 
«Testa late umbilicata, subdiscoidea, tenuis, diaphana, vi- 
iracea, nitida, sordide fusca, undique regulariter et oblique 
subtiliter costata, interstitiis sub lente minute striatis; spira 
perparum elevata, apice obtuso, sutura impressa; anfr. 5—51!/5, 
modice convexi, ultimus convexus, antice leviter descendens, 
basi convexus; umbilicus amplus, modice profundus, fundo ro- 
tundatus; apertura obliqua, rotundato-lunata; peristoma sim- 
plex, rectum, acutum, marginibus subdistantibus, dextro vix 
expansiusculo, columellari non reflexo. — Diam. maj. 1!5, 
min. 1!4, alt. ?/, lin.» (B. angl.) 
Helioc assimilis (Pitys) Braz. in Proc. Zool. Soc. 1871. p. 697 
Habitat prope Hobart Town Tasmaniae (Petterd ). 
911. H. adposita (Patula) Mousson. 4j 
«T. anguste umbilieata, convexo-orbiculata, tenuiter et in- 
aequaliter sed acute oblique plicoso-striata, cornea. Spira con- 
vexiuscula, modice spirata; summo minuto, obtuso; sutura im- 
pressa. Anfr. 4!/, modice accrescentes, convexiusculi, supra 
arcte tumiduli; ultimus paulo major, non descendens, ad sutu- 
ram et ad umbilicum magis, caeterum minus rotundatus.. Aper- 
tura subverticalis (209? cum axi), late lunato-circularis, plieis 
