-'-' 1 MMiTi.oi-sis pi. . \TYSI ( ( IM:A. 



Similar In SimpuloprtS in contour, hut pallid, not plicate, and with 



a|ic\ -Ilinnlli. 



I have not examined the apices of 5. atnea or X j,siilil ; hut it is 

 smooth, \\itliout spiral stria-, in S. portoriceHSIS &Tld N. </>>,< iin'ci /ixtg. 

 I look upon Pliitt/siirrinrn as a iMoiip ancestral to G'tfof/s. and proh- 

 ably differing from the typical forms oi Simpulopsis in some structural 

 characters hcsides (lie difference in the apex: hut only a thorough 

 study of tin- .-oft anatomy can justify Mich >u-pi-ions. 



Antilli-s : Porto Rico, S. jKirtnriccusi's, S. 

 Haiti, >'. 



Mexico : >'. 



S. r()KT(i;i('KNsis Shutlleworth. I'l. G3, li^s. C>7, M. 



Shell semi-oval, ventrieose. thin, glossy and nearly smooth, heinir 

 M-ulptured \\ith slight irrejfiilar growth-wrinkles, stronger near the 

 aperture; somewhat translnreiit, very pale stiau-tinted. Spire 

 prominent; \vhorls ahout '_",, verv rapidly increa>in^ and vei-y eon- 

 vex, the suture deeply impressed ; last whorl ventrieose. Aperture 

 rounded-oval, very oblique; perislome thin; columella regularly ar- 

 cuate, thin. 



Alt. 1 '2. <), diam. 13 mm. 



Alt. 1 -2, diam. 1") mm. 

 Si, rni <li' I.in/iiil/'i, Porto Ji'fi-n, aliiindant on hanana leaves ( Hlaurier). 



S. porforicensis SIH-TTI... Dia^n. n. Moll., in Mittheil. der Natur- 



to|---c|ieiiden (lesellsehaf't ill Hern, ]K;")4, p. ."i.'i (separate copies, p. 

 117). I'M:., Meno:r. iv, p. tSOl ; V) p. 'J2. ('HOSSK, Journ. de 

 Concbyl. l^'.i-J, p. '2'2. Platysuccinea portoricensis ANCKV, Le. Na- 

 turalise, iii, 1H81, p. -1S4. 



Evidently allied to the smalh-r, le>> eh-xaled, S. d<niii>iictin-ix. It 

 has not heen figured liefore. 



- 



S. I-MI.II (.Marten-.). I'l. ',;!, li-rs. :;, C I. 



Shell imperlorale, globose-Conoid, thin, shining, striatulate, pale 

 luitf. Wlioi'l> .'!, a little convex, forming a conic >pire \\ilh oliluse 

 apex; the la>l \\horl inflated helow. Api ilure oliliipie, lunate-cir- 

 culai-, occupying two-thirds the total length of the shell ; upjier mar- 

 \l\\\ -onie\\ hal straightened, produced in a sis'inoid curve ; columellar 

 mai'Lim thin, a little arcuate. Alt. ~>, greater diam. :> y h-sser I, oh- 

 liipie all. iJ' aperture ;i[. width ,'t mill. ( .M,i 



