Zoological Society, 343 



its peritreme thinner, its columella straighter, and angular in front 

 externally. A variety occurs with two dark brown, nearly black, 

 bands, the one above and the other below the ordinary green band. 

 The posterior of these is seen nearly up to the apex. 



Helix (Cochlogena, De F.) collodes. Hel. testa subglohosa, 

 tenuivscula, 7iitida, alba ; epidermide lutescente induta, apice ro- 

 seo ; spird subelatd, obtusd ; anfractibus quinque, ventricosis, 

 ultimo ad basin paululum planulato ; suturd distinctd, antict 

 castaned ; aperturd subrotundd, intils albd ; peritremate reflexo, 

 nigricante ; columelld albicante, paululum recurvd. 

 Long. 1-2; lat. 1-2 poll. 

 Hab. ad insulam Tablas, Philippinarum. 



I have named this species collodes, in consequence of the remark- 

 able appearance of the epidermis, like a coat of glue covering all the 

 outer surface except the apex. In form this species is much like 

 H. ignobilis ; its spire is not, however, so much acuminated, and the 

 apex is much more obtuse than in that species : its peritreme, more- 

 over, is thinner, and although reflected, it is not rounded as in that 

 species. 



Helix (Cochlostyla, De F.) Orbitulus. Hel. testa subglobosa, 

 crassiuscula, lavis, oblique lineis incrementi tenerrime insculpta ; 

 unfractibus 4^ ad 5, subventricosis, ultimo maxima, ventricosiori ; 

 suturd distinctd, antice albd; aperturd subrotundd, intils albd; 

 peritremate latiusculo, rotundato, reflexo, albo ; columelld albd, 

 rectiusculd, paululum inflexd. 



Long. I'l; lat. I'l poll. 



Hab. prop^ Mansalai ad insulam Mindoro, Philippinarum. 



Var. a. Shell nearly globular; spire very obtuse, white, base dull 

 yellowish ; two spiral green bands commence at about the third vo- 

 lution, and increase in width and strength of colour until they reach 

 the back of the outer lip ; of these the lower is by much the broader. 



Var. b. Shell oblong, and coloured in the same manner as the last; 

 but the last volution is green above (the anterior side of the suture 

 being always pure white), increasing in intensity from its commence- 

 ment : in this variety the dull yellowish colour of the anterior or 

 basal part of the last volution is much deeper than in var. a. 



Var. c. Shell larger ; its volutions rather more ventricose, similar 

 to the last in colouring, but having two additional dark brown, nearly 

 black bands, which are distinctly seen within. This is by far the 

 largest and handsomest variety of the three. 



Note. — " M.Valenciennes informs me that this species was brought 

 in 1 830 by the officers of the ' Favourite/ and placed in the galleries 

 of the Museum of Paris, under the name of H. chlorogrammica, Val. ; 

 but as it does not appear that he has published either the name or 

 any description of the species, I continue to use the name which I 

 have given it above." 



Helix (Cochlostyla, De F.) Oomorpha. Hel. testa ovato-ob- 

 longa, crassa, obscura, spiraliter tenuit^r substriata, lineis incre- 

 menii decussata ; anfractibus quinque subventricosis ; suturd di- 



