Zoological Society. 231 



reddish brown : var. c. green, with a dark brown band near the su- 

 tural band, and a dark brown spiral band close to the columella : var. 

 d. the same, with two intermediate brown bands, both of which, 

 however, are not continuous : var. e. brown, with a dark brown band 

 next to the sutural white band, and the dark brown spiral band sur- 

 rounding the columella. In all these varieties the narrow white 

 sutural band is constant, and the anterior part of the last volution 

 within the aperture is yellower than the outer surface. 



Helix (Cochlogena De F.) hydrophana. Hel. testd obovatd, 

 tenuiusculd, nitiduhU anfractihus quinque ventricosis, oblique te- 

 nerrime striatis, ultimo majori, cceteris duplo longiori, omnibus 

 plhs minusve epidermide hydrophand indutis ; aperturd suborbicu- 

 lari, peristomate albo, rotundato, reflexo ; columelld subarcuatd, 

 antice in tuberculam indistinctam productd. Long. 1*35, lat. 

 1-05 poll. 

 Hub. prope Puerto Galero ad insulam Mindoro Philippinarum. 

 The ground colour of this extraordinary species is brownish yel- 

 low, and it has two, three, or four broader or narrower very dark 

 brown spiral bands. A rather thinner variety, with three bands, is 

 found in the island of Corregidor, in the Bay of Manilla. The most 

 remarkable circumstance in its natural history is that it is more or 

 less covered with a very thin, opaque, white epidermis , which becomes 

 transparent on being wetted ; the dark brown bands are then seen 

 brilliantly contrasted with the yellowish brown general colour of the 

 shell. 



Helix (Helicostyla De F.) cepoides. Hel. testd suborbiculari, 

 tenui, spird subdepresso-conicd ; anfractibus senis, ventricosis, 

 postice depressiusculis, lineis incrementi striatis ; suturd distinctd ; 

 aperturd semilunari, peristomate postice tenui, subrejlexo, tilm 

 crassiori, reflexo ; columelld in dentem obtusum producto. Long, 

 1-8, lat. 2-2 poll. 

 H. cepoides. Lea, M.S. secund. Jay. 

 Hab. ad insulam Luban Philippinarum. 



This species most nearly resembles H. unidentata. Lam. Anim. 

 sans Vert. VL pt. 2, p. 74, from which it may easily be known by 

 its more ventricose volutions, and its much narrower aperture. It 

 differs also in colour, the unidentata being usually of a dark chestnut 

 brown, while in the Dolium the spire and more than the upper half 

 of the last volution are of a light brown, and the remainder lighter 

 coloured still, and between the darker and lighter colour is a band 

 of nearly white. The epidermis in this species is very thin and pale- 

 coloured, and it has alternating darker marks close to the suture. 

 A variety occurs of a nearly uniform pale brownish yellow colour, 

 though in other respects similar. 



I gladly adopt Lea's manuscript name of cepoides. 



Helix (Helicostyla ? De F.) arata. Hel. testd ovatd, subcy- 

 lindricd, crassiusculd, rufo-fuscescente,fascid antemediand albidd ; 

 anfractibus senis, subventricosis, oblique exaratis, subrugosis ; 

 suturd distinctd, crenulatd ,• aperturd fere circulari, intus albd. 



