95 
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, whose admirable ‘ Mono- 
graphia Heliceorum Viventium’ is one of the most valuable contri- 
butions to Malacology that have been published for many years. 
Hewrx Panpor#. UH. testd obtect? perforatd, depresso-globosd, 
tenui, rugulosd, concentricé minutissime striatd, anfractibus supra 
peripheriam fuscis, infra et prope peripheriam albidis fusco cin- 
gulatd, basi albidis ; aperturd rotundatd intus fuscd albido-fasci- 
atd, margine interno incrassato albo; peristomate reflexiusculo, 
extus albo-labiato, margine columellari dilatato, reflero, umbili- 
“ cum occultante. 
+ Diam. max. 17, min. 16, alt. 14 mill. (Pl. IX. fig. 3 a, 4.) 
Collected near the Straits of Juan del Fuaco; allied to the last 
species, but very distinct. 
Hewrx Kewtetri. JZ. testd angust? umbilicatd, depresso-globosd, 
tenui, rugulosd, granulatd, fulvd, spird subturbinatd, sordidé flavo 
conspersd, rufo-unifasciatd, anfractibus 6, convexiusculis, ultimo 
ad peripheriam fascid pallida cincto, basi subinflato; aperturd 
lunato-rotundatd, intus pallide fuscd, unifasciatd ; peristomate 
reflexiusculo, margine columellari dilatato, reflexo, umbilicum oc- 
cultante. 
Diam. max. 22, min. 19, alt. 19 mill. (Pl. IX. fig. 2 a, 6.) 
This species is nearly allied to Helix Californiensis, 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. 
Hevrx vexxiicata. H. testd aperte umbilicatd, tenui, convero- 
depressd, subnitidd, sulcato-striatd, striis minutissimis spiralibus 
decussatd, lete viridibus ; spird conveviusculd, anfractibus 6, ulti- 
mo rotundato magno, anticé 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? (Pl. IX. fig. 1a, , ¢. 
Distinguished from its near allies by the peculiar deflexion of the 
upper portion of the lip-margin. 
Butimus CHEMNITzIoIDES. Bul. testd subperforatd, turrito- 
subulatd, regulariter costatd, costis numerosis, nitidulis, flaviduld, 
fascia spirali fusco-purpured cinctd ; anfractibus 14, ultimo 4 
longitudinis subequante, basi fusco-purpureo ; columella subrecta, 
albidd ; peristoma simplex, acutum ; margine externo supern? arcu- 
ato; aperiurd ovali-oblongd. ; 
Long. 19, diam. 4 mill. ; apert. 3 mill. longa, 2 lata. 
Chatham Island, Gelepagos. (Pl. IX. fig. 6 a, 5.) 
This beautiful species strikingly resembles a marine Chemnitzia. 
