212 



GMIIIS SIMPI'LOPSIS Heck, 1837. 



Simpulopsis I>KCK, Index Moll., p. 1 IMI._ M .\ i; i i N-> in Albers' 

 Die Heliceen, p. .'SOS (type ,S'. SH/CH/HSH I'Y-r.). PFH., Noinencl. IIi-l. 

 Viv., 1*7*. p. L'L'S. -- SV/WuywiiGltAY, P. /. S.. 1M7. p. 171 (type 



Shell imperforate, varying from <_ r lohose to ovate, very thin, mainly 

 cutieular. usually with few whorls; the hist very larire ; apical I. 1 , m 

 1^, \\horls with excessively line spiral striiition, except in submenus 

 Platysuccinea \ apertnie lar^e, rounded lunate or ovate, oblique ; 

 peristome and eoluinella very thin, simple and arcuate. Type 



St/frii/nSU Ker. 



The jaw is archeil and eoinpo.-eil of numerous plaits, as in Dnj- 

 ntiriis ; I'adula about as in Bulimulut, luit the cusps of the teeth are 

 more >i roiiL. r lv developed. 



The species live on and amonjj plants in moist woods. The ^roup 

 was at first associated with S>n-,-iiti ; Pfeiffer then placed the species 

 in I'lfriiKt. It was reco<:ni/ed as aL r enns by .Miirch in 1 s.V_>, and by 

 Shuttleworth in l.s-"i|; these authors lieinjr followed bv I'teitler. Dr. 

 Paul Kiscber, in 1*7.'). was the lir>( to recogni/.e the linlininlid allin- 

 ities of the ^roup. 



The typical ^roup of species occurs in Bra/il, from the State of 

 Bahia to Sao Paulo ; but one species has been found in Trinidad 

 and another in Nicaragua. An aberrant jrnmp of forms with 

 smooth apical whorls is found in the West Indies and Eastern 

 .Mexico. Several old-world forms have been relerreil to StmpulopSM 

 (flee p. -- 1 '), but their status is uncertain. 



Tue species fall into three sections or siib:eiiera : 

 I. Apical whorls spirally striate. 



1. Siiii/iii/'ijmis s. sir. Short globose shells, excessively 

 thin, mainly cuticular, somewhat llexilde. \\itli .'! to -I.', 

 whorN; coi-]-ii p u r aled or imp-lv wrinkled, \ar\iiiLT from 

 jrreeni.-Ii-yellow to (dive-brown. 



'2. /{ii/iiiiii/H/isis Pil>liry. 1MI'.. ( )bl(.UL. r -o\ ale or lolio>e- 

 conic, higher than wide, /noo^A, glossy and brill I", lii/ht 

 //'/>,/; whorla 1 to 5^. I'.ra/il. (See p. -_'j(i.) 

 1 1. Apical whorl- siiio 1 ii h. 



.'!. Plafysuccinca Aucev, l.ssl. (Jlobo-e, thin, rather 

 brittle, with '2 ', to .'!.'. whorl- ; striated or >mooth, li^rht- 



