Diam. 23, alt. 15 mill. — Australia orient. (Gilbert in 
coll. Cuming.) 
300. Helix decorata Pfr. — T. perforata, depresso- 
globosa, tenuis, striatula, albida, taeniis variis interruplis casta- 
neis, interdum confluentibus decorata: spira brevis, obtusa; 
anfr. 4!/. convexi, ultimus non descendens; apertura rotundato- 
lunaris, intus livido -fusca; perist. acutum, intus vix labiatum, 
margine columellari membranaceo, dilatato, fornicatim reflexo. 
Diam. 18, alt. 12 mill. — Patria? (Coll. Cuming.) 
301. Helix Spratti Pfr. — T. umbilicata, depressa, 
confertim costulata, sordide alba vel fusca, saturatius fasciala, 
carinala: carina compressa, prominente, denliculata; spira vix 
elevata; anfr. 5 supra carinam valde turgidi, subangulatim ele- 
vati, ulumus basi convexus, antice non. descendens; umbilicus 
latissimus, perspectivus; aperlura parvula, angulato - subrotun- 
data; perist. rectum, acutum, intus albolabiatum. 
Diam. 9, alt. 4 mill. — Ins. Malta. (Spratt.) 
Dilfert ab H. rugosa (Chemn.) Lam. umbilico multo latiore, 
anfractibus turgide elevatis, sutura profunda, etc. 
302. Helix trochlea Pfr. — T. perforata, conico- 
lurrita, irochlearis, costulato-striata, albida, interdum fusco- 
maculata vel basi fusco-fasciata; anfr. 8 acute crenulalo-carinati, 
late exserli, ntrinque planulati, ultimus basi subtilius et con- 
ferlius striatus, convexiusculus, antice non descendens; apertura 
securiformis; perist. acutum, margine basali arcuato, intus leviter 
labiato, columellari subdilatato, ad perforationem subreflexo. 
Diam. 7?/, alt. 8 mill. — Patria? (Coll. Cuming.) 
303. Helix Syrensis Pfr. — 7T. umbilicata, orbicu- 
lato-conica, confertim costulata, carinatla, sordide albida, fusco 
vel spadiceo marmorata; spira depresso-conica, apice aculius- 
cula, cornea; anfr. 5 exserli, subplanulati, ultimus basi con- 
vexiusculus; umbilicus angustus, pervius; apertura rotundato- 
lunaris; peris. acutum, intus albido - labiatum. 
Diam. 8, alt. 5 mill. — Insula Syra. (Forbes.) 
304. Helix bicostata Pfr. — An H. Rafinesquea Fér. 
L-51 A. F5? — T. subperforata, semiglobosa, superne sub- 
arcuatim rugoso -slriata, nilidula, flavida; anír. 7 angusti con- 
vexiusculi, ultimus basi subplanus, medio impressus, laevigatus, 
lineis concentricis sub lente notatus; apertura late lunaris, basi 
rostis. 2. validis, marginem non attingentibus munila; perist. 
simplex, acutum, margine columellari perobliquo, calloso. 
Diam. 9'/,. alt 5 mill. — Patria? 
