92 PEOCEEDINGS OF THE MALACOLOGICAL SOCIETY. 



obtcgcnto. Diara. maj. 21'5, min. 18 mm. ; alt. 14 mm. Apcrtura 8 

 alta, 10 lata. A smaller example is 19 mm. in its greater diameter 

 and 11*5 in height. Hab. — Montalivet Island, N.W. Australia. 



This species varies somewhat in size, judging from the five specimens 

 collected by Mr. Walker. They appear, however, to be quite constant 

 in coloration. Of the two red narrow bands which ornament the 

 upper part of the whorls, the upper one borders the suture and the 

 lower is a trifle above it. In the body-whorl the lower zone is 

 just above the periphery. The thickening near the middle of the 

 columellar margin of the aperture is evident in all the examples, 

 but it hardly amounts to a tooth. It is of a whiter tint than the 

 rest of the peristome. 



Helix (Hadra) Sykesi, n.sp. PI. YII. Fig. 8. B.M. 



Testa U. Montalivetensis similis, sed altior, umbilico fere obtecto, 

 columella minus dentata, roseo-purpurca. Diam. maj. 21 "5, min. 

 18 mm.; alt. 17 mm. Apcrtura 8-5 longa, 10 lata. ITab. — Parry 

 Island, Admiralty Gulf, N.W. Australia. 



This species is very like IT. Ilontalivetensis, but is distingiiishable 

 by the above characteristics, which are quite constant in the five 

 specimens of each form examined. In coloration and sculpture they 

 are quite similar, but there is a marked difference in form owing 

 to the greater elevation of the spire in II. Sykesi. The columellae 

 also are dissimilar. 



Helix (Hadba) imitata, n.sp. PI. YII. Fig. 15. B.M. 



Testa H. Montalivetensis similis, sed supeme lineis incrementi multo 

 fortioribus, umbilico fere clauso, anfractu ultimo magis descendente. 

 Diam. maj. 19'5, min. 17 mm.; alt. 14-5 mm. Apcrtura 7 longa, 

 8 lata. 



Var. Cassiniensis, PL VII. Fig. 16. Testa minor, peristomate 

 conspicue incrassato. Diam. maj. 14-18 mm. 



Hah. — Baudin, N. Maret, and Condillac Islands, also at Cape 

 Bougainville, N.W. Australia. Var. at Cassini Island. 



This and the two preceding species are similarly banded, and are 

 very much alike in general appearance. Still they present certain 

 differences which appear to be sufiicient to warrant their specific 

 separation. The present species is much more strongly sculptured 

 than the others, the lines of growth amounting to fine costulations. 

 The umbilicus is as much closed as in H. Sykesi, but is not tinted, 

 the lip more thickened, especially in the variety from Cassini Island, 

 and the last whorl is generally more deflected. 



Helix (Teachia) Deebyana, n.sp. PI. VII. Fig. 19. B.M. 



Testa orbicularis, depressa, mediocriter late umbilicata, subpellucida, 

 cornea, superne iiTcgulariter luteo vel albido strigata vel marmorata, 

 subtus pallidior, nitida; anfractus 5, regulariter lente accrescentes, 

 convexi, oblique tenuiter striati, ultimus ad peripheriam obtuse 



