mii MN und 
fusca, carinata: carina antice obsoleta: spira parum elata, pal- 
lida; anfr. 4 planati, ultimus basi planiusculus, circa umbilicum 
mediocrem, non pervium subangulatus; apertura perobliqua, 
transverse lunato elliptica; perist. subincrassatum , breviter re- 
flexum, coerulescenti-fuscum, marginibus callo introrsum diffuso 
atro-purpureo junctis, dextro dilatato, depresso, basali strictius- 
eulo, eum columellari obliquo angulum obtusissimum formante. 
Diam. 32, slt. 14 mill. (Mus. DrRt.) — Madagascar. 
Ditfert ab H. fulgurata sculptura, spira elevata, basi pla- 
nulata, apertura subhorizontali, umbilico non pervio. —  Ra- 
rissima ! 
999." Wlelux'soror"'Rer pr. 118. Hist; t! 54. "£4: 
Wood spl. t. 7. £.. 51. —  Carocolla quadridentata Mke catal. 
Malsb. p. 5. — T. umbilicata, depressa, lenticularis, acute 
carinata, oblique siriata, granulata, violaceo -fusca. medio late 
albido-cingulata; anfr. 4!/, planulati, ultimus antice deflexus, 
basi vix convexus, antice scrobiceulatus; apertura subhorizontalis, 
elliptica; perist. subincrassatum, marginibus callo junctis, supero 
sinuoso, expanso, basali reflexo, umbilicum mediocrem semile- 
gente, dentibus 4 aequaliter distantibus, lamelliformibus, intran- 
libus armato. 
Diam. 32, alt. 11 mill. — Jamaica. 
353. Hclix volvoxis Parr. — H. septemvolva Say ? — 
T. umbilicata, orbiculato-convexa, tenuis, rufo-cornea, pellucida, 
regulariter costulato-striata; spira brevissima, convexa; anfr. 7 
convexi, regulariter accrescentes, ultimus reliquis superne vix 
latior, angulatus, infra angulum inflatus, striatus, nitidus; um- 
bilicus latus, regularis, anfractu ultimo latissimo, reliquis regu- 
lariter decrescentibus; apertura majuscula, reniformis; perist. 
intus callosum, reflexum, marginibus callo brevi, triangulari, 
dentiformi junctis. 
Diam. 8—9, alt. 4 mill. — Georgia. 
Num haec an H. cereolus Mühlf. (planorbula Lam. Deless., 
septemvolva Fér.) sit vera H. seplemvolva Sayi, ex descriptione 
Sayana non elucet. Utramque speciem sub eodem nomine sae- 
pius ex America accepimus. 
354. Helix plectostoma Bens. Journ. As. Soc. V. 
p. 351? —- T. umbilicata, sinistrorsa, depresso-conoidea, sub- 
tus tumida, albida, epidermide cornea, decidua induta; spira 
exserüiuscula; anfr. 6 supra planati, radiatim plicati, lineis ele- 
valis, confertis decussali, ultimus superne angulatus, lineis paucis 
elevatis infra angulum notatus; apertura lunari, dente triangulari 
parietis aperturalis, saepe obsoletiore, coarctata; umbilicus me- 
