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There are two species of Cyclostoma, the fine C. grande (no lo¬ 
cality is attached to it), and an equally beautiful one -which I have 
named C. purum. 
The following diagnoses of the new species in the collection have 
been modeled on those of Dr. L. Pfeiffer, wdiose admirable ‘ Mono- 
graphia Heliceorum Viventium ’ is one of the most valuable contri¬ 
butions to Malacology that have been published for many years. 
Helix Pandoras. H. testd obtecte perforatd, depresso-globosd, 
tenui, rugulosd, concentrice minutissime striatd, anfractibus supra 
peripheriam fuscis, infra et prope peripheriam albidis fusco cin- 
gulatd, basi albidis; aperturd rotundatd intus fused albido-fasci- 
ata, margine interno incrassato albo; peristomate reflexiusculo, 
extus albo-labiato, margine columellari dilatato, reflexo, umbili- 
cum occultante. 
Diam. max. 17, min. 16, alt. 14 mill. (PI. IX. fig. 3 a, b.) 
Collected near the Straits of Juan del Fuaco; allied to the last 
species, but very distinct. 
Helix Kellettii. H. testd anguste umbilicatd, depresso-globosd, 
tenui, rugulosd, granulatd, fulvd, spird subturbinatd, sordide flavo 
conspersd, rufo-unifasciatd, anfractibus 6, convexiusculis, ultimo 
ad peripheriam fascia pallida cincto, basi subinflato; aperturd 
lunato-rotundata, intus pallide fused, unifasciatd; peristomate 
reflexiusculo, margine columellari dilatato, reflexo, umbilicum oc¬ 
cult ante. 
Diam. max. 22, min. 19, alt. 19 mill. (PI. IX. fig. 2 a, h.) 
This species is nearly allied to Helix Calif 'orniensis, Lea. It dif¬ 
fers in the more pyramidal contour of the spire, in the less tumid 
body-whorl, and consequently differently shaped, more lunate, slightly 
elongated mouth. The margin of the mouth is more reflected. 
Helix vellicata. H. testd aperte umbilicatd, tenui, convexo- 
depressd, subnitidd, sulcato-striata, striis minutissimis spiralibus 
decussatd, Icete viridibus; spird convexiusculd , anfractibus 6, ulti¬ 
mo rotundato magno, antice dilatato, subdescendente; aperturd 
perobliqud, lunato-oblongd; faux alba, peristomate margine sub- 
reflexo, superne deflexo-sinuato . 
Diam. max. 22, min. 18, alt. 8 mill. 
From Panama ? (PI. IX. fig. 1 a, b, c.) 
Distinguished from its near allies by the peculiar deflexion of the 
upper portion of the lip-margin. 
Bulimtjs chemnitzioides. Bui. testd subperforatd, turrito- 
subulata, regulariter costatd, costis numerosis, nitidulis, flavidula, 
fascia spirali fusco-purpurea cincta; anfractibus 14, ultimo 4 
longitudinis subeequante, basi fusco-purpureo ; columella subreetd, 
albidd; peristoma simplex, acutum; margine externo superne arcu- 
ato; aperturd ovali-oblongd. 
Long. 19, diam. 4 mill.; apert. 3 mill, longa, 2 lata. 
Chatham Island, Gelepagos. (PI. IX. fig. 6 a, b.) 
This beautiful species strikingly resembles a marine Chemnitzia. 
