SIMPULOPSIS. 
Puatre I, 
Genus SIMPULOPSIS, Beck. 
Testa conico-globosa vel Neriteformis, tenuis, membranacea, 
parum nitens, spirdé nunc parvi, laterali, nunc pro- 
minuld, anfractibus ventricosis, plerumgue oblique pli- 
cato-corrugatis ; apertura plus minus obliquad, inter- 
dum perampliter patente. 
Shell conically globose or Nerite-shaped, thin membrana- 
ceous, but little shining, spire sometimes small, lateral, 
sometimes rather prominent, whorls ventricose, gene- 
rally obliquely plicately wrinkled ; aperture more or 
less oblique, sometimes very largely open. 
An interesting group of shells is here brought together 
in two plates under the name Stmpzlopsis, as originally 
proposed by Dr. Beck, and adopted in the last volume of 
his monograph by Pfeiffer. They partake of the characters 
of Succinea and Vitrina, inhabiting Mexico and Brazil, 
where Vitrina is not known. The shell in its typical 
form is plicately wrinkled throughout, and globosely in- 
flated, sufficiently capacious to allow of the animal retiring 
into it. It is more nearly allied, therefore, to Succinea 
than to Vitrina. 
One of the species, a true Stmpulopsis, is recorded as a 
native of Salomon’s Island. 
Species 1. (Mus. Cuming.) 
Smmputopsis Curapensis. Simp. testd depressé globosd, 
olivaceo-corned, spird parva, parum prominuld, an- 
fractibus oblique convexis, confertim minute striatis ; 
apertura diagonali, lunato-circulari. 
Tue Curapa Simpunopsis. Shell depressly globose, 
olive-horny, spire small, but little prominent, whorls 
obliquely convex, closely minutely striated; aperture 
diagonal, lunar-circular. 
Preirrer, Pro. Zool. Soc. 1856, p. 377. 
Hab. Chiapa, Mexico. 
Not a very characteristic species, partaking as much of 
Vitrina as of Simpulopsis. 
Species 2. (Mus. Cuming.) 
SIMPULOPSIS DECUSSATA. Simp. testé conico-globosé, 
tenuissimd, eneo-corned, valde pellucida, spird subpro- 
minuld, anfractibus declivi-ventricosis, costellis obliquis 
et spiralibus undique subtilissimée decussatis ; apertura 
oblique ovata. 
THE DECUSSATED SrmpuLopsis. Shell conically globose, 
very thin, bronze-horny, very transparent, spire ra- 
ther prominent, whorls slopingly ventricose, very 
finely decussated, with slender oblique and spiral 
ribs ; aperture obliquely ovate. 
Prerrrer, Malak. Bl. 1856, p. 260. 
Hab. Petropolis, Rio Janeiro; Miers. 
A shell of remarkably transparent tenuity, yet preserv- 
ing the utmost symmetry in its convolution. 
Species 3. (Mus. Cuming.) 
SIMPULOPSIS RUFO-VIRENS. Simp. testd globoso-ovaté, 
virescente-corned, spird parva, anfractibus convexis, 
oblique confertim irregulariter plicato-corrugatis ; 
apertura ovatd, perobliqua. 
THE RED-GREEN SrmputLopsis. Shell globosely ovate, 
greenish-horny, spire small, whorls convex, obliquely 
closely irregularly plicately wrinkled ; aperture ovate, 
very oblique. 
Succinea rufo-virens, Moricand, Mém. Soc. Phys. Genéve, 
3rd Supp. p. 53. pl. 5. f. 4. 
Vitrina rufo-virens, Pfeiffer. 
Stipulopsis rufo-virens, Pfeiffer. 
Hab. Bahia, Brazil. 
There is no decussating spiral sculpture in this species 
as in the last; the surface is thick-set throughout with 
irregular oblique wrinkles. 
Species 4. (Fig. a, 6, Mus. Cuming.) 
Srmputopsis Mirrst. Simp. testd conico-globosd, tenuis- 
simd, virente-olivaced, eneo-corned, spird brevi, apice 
acuta, anfractibus convexis, ampliter inflatis, undique 
modiceé oblique plicato-corrugatis ; apertura perobliqua, 
subpyriformi-ovatda. 
Miers’ Stmputopsis. Shell conically globose, very thin, 
greenish-olive, bronze-horny, spire short, sharp at the 
apex, whorls convex, largely inflated, everywhere 
moderately obliquely plicately wrinkled; aperture 
very oblique, somewhat pyriformly ovate. 
Pretrrer, Malak. Bl. 1856, p. 260. 
Hab. Espirito Santo, Brazil; Miers. 
May, 1862. 
