HELIX. 



Plate XXIII. 



Species 96. (Fig. a, i, c, Mus. Cuming.) 



Helix Sikena. Hel. testa imperforatd, globoso-depressd, 

 diaphand, spiraliler minutmime el coii/ertmime striata, 

 pallid!; viridi aut slramined, fasciis riifts et saturati 

 viridi/tiis ornald ; spird paritm elevald ; suturu l(Boi ; 

 anfraclibus qualiior, convexiuscuUs, ultimo ad periplie- 

 riani interdum subangulato, allido-cingidato, anlice 

 siibito dejlexo ; columella brevi, arcuatd, macula fused 

 circumdald ; apertnrd lu7iato-ellipticd, iidus fasciatd ; 

 peristomaie simplici, late expanso, nigricantc vel alio, 

 marginibus conniventiius. 



Siren's Helix. Shell imperforated, globoscly depressed, 

 diaphanous, spirally very minutely and elosely stri- 

 ated, pale green or straw-eolour, ornamented with 

 red and darker green bands ; spire but little raised ; 

 sutui'e smooth ; whorls four, rather convex, the last 

 sometimes slightly angled at the peripheiy, encircled 

 with white, suddenly deflected in front; colimiella 

 short, arched, surrounded with a brown blotch ; 

 aperture lunar-elliptical, banded within ; lip simple, 

 broadly ex])anded, blackish, or white, with the edges 

 closing inwards. 



Beck, Pfeitl'er, SymboltC, vol. ii. p. 39. 



Ha/>. Island of Panay, Philippines ; Cuming. 



Distinguished by a peculiarly compressed form, the shell 

 is of rather transparent substance, with the lip as fre- 

 quently white as it is black. 



Species 97. (Mus. Cuming.) 



Helix opalina. Kel. testa imperforatd, pgramidali, 

 apice obtusd, teiiui, hgalind, virescente-albidd, lavi, 

 nitidd; suturd liiieari, alJio-marginatd ; anfraclibus sex, 

 planis, ultimo obtuse carinato ; columella teiiui, arcu- 

 atd, subdentatd, sulco obsoleto circumdald; aperturd 

 perobliqud, lurmto-subcirculari ; peristomate simplici, 

 vix expanso. 



The opal Helix. Shell imperibrated, pyramidal, obtuse 

 at the apex, thin, hyaline, greenish-wliite, smooth, 

 shining ; suture linear, edged with white ; whorls six, 

 flat, the last obtusely keeled ; columella thin, arched, 

 somewhat toothed, surrounded by an obsolete groove; 

 aperture very oblitpic, Innately subcircular ; li]) 

 simple, scarcely expanded. 



SowEiiBY, Pro. Zool. Soc. IS 10, p. !)S. 



Hob. Cagayan, Island of Luzon, Philippines ; Cuming. 



June, 



This species, from its j)yraMnii;il plan oi fouvolution, 

 approaches the Bulimus fonn ; it nmst not, howtvi-r, be 

 confounded on that account with B. opaliiiut. 



Species 98. (Pig. o, 4, Mus. Cuming.) 



Helix oojiorpha. Uel. teitd nmbiliratd, ocato-cfilongd, 

 crassiusculd, longitudinaliler minute striata el sii6- 

 decussalim malleatd, castaiied, prope suturam pallidi 

 fasciatd; spird obtuse otato-conoided ; anfraetihun 

 quinque, convexis, ultimo spird paulo breviore ; aperturd 

 subcerticali, ovali, intus nititli albd ; perulomatv latr 

 expanso, rejiexo, marginibus approximatis, columetlan 

 talde dilalato, reflexo, umbilicum celante. 



TuE EGG-SHAPED BcLlMLS. Shell umbilicaled, ovately 

 oblong, rather thick, longitudinally minutely striated 

 and subdccussatfly indented, chestnut, with a pale 

 band near the suture ; spire obtusely ovately conical : 

 whorls five in number, convex, the last rather 

 shorter than the spire; aperture s\ibvertical, oval, 

 shining white within ; lip broadly expanded, reflected, 

 with the margins approximated, columcllar margin 

 much ililated, reflected, covering the umbilicus. 



SowEKiSY, Pro. Zool. Soc. 18-10, p. 103. 

 Bulimus oomorphus, Pfeiffer. 



Hab. Island of Tablas, Philippines ; Cuming. 



A rather solid shell, obliquely superficially indented. 

 with a characteristic light band near the suture. 



Species 99. (Mus. Cuming.) 



Helix oblonga. Hel. testd umbilicatd, oblongd, aubcy- 

 lindraced, teiiui, brunned, subnigosd ; spird magia 

 minusve elongatd, apice ohtusiuaculd ; anfraclibus i/iiin- 

 que ad sex, conrexis, ultimo spird multo breciore , 

 aperturd subverticali, oblougo-ovali, intns licidd ; pf- 

 ristomate expanso, subnflexo, mnrgine columellari ealdr 

 dilalato, umbilicum suboccultante. 



The oulong Helix. Shell uinbilicatcd, oblong, sul)- 

 cylindrical, thin, brown, subrugosc; spire uion- or 

 less elongated, rather obtuse at the apex; whorls 

 five to six in number, convex, the Inst much i-hortcr 

 than the spire; aperture subvertical, oblong-oval, 

 livid \vithin ; lip expanded, sliirhtly reflected, rolu- 

 nu'llar margin much dilated, nearly concealing tin- 

 umbilicus. 



1S51. 



