256 HELIX-CHLORITIS. 



shallow spiral furrows and malleations on the base. Spire flat or a 

 little convex, the suture deeply impressed ; whorls 5, convex, the 

 last wide, obtusely angled at the periphery, which is above the mid- 

 dle of the whorl ; a trifle descending in front. Below the periphery 

 the surface slopes to the prominence around the broad umbilicus, 

 within which the whorls are visible to the apex. The aperture is 

 oblique, narrowly lunar, livid inside, the lip white or pink, expanded, 

 outer, basal and columellar margins reflexed, the columellar edge 

 impinging upon the umbilicus. Parietal wall with a transparent 

 wash of callus. 



Alt. 16, greater diam. 46, lesser 40 mill. 



Alt. 15, greater diam. 41 mill. 



New Hanover, New Ireland, Admiralty Is. 



H. majuscula PFR., Proc. Zool. Soc. Lond. 1856, p. 381 ; Novit. 

 Conch, i, p. 107, t. 30 f. 3-5 ; Monog. Hel. Viv. iv, p. 300 DOHRN 

 in Kiister's Conchyl. Cab. p. 592, t. 173, f. 14-16. 



A large, chestnut-brown species, flat above, with deeply impressed 

 sutures. The umbilicus is broader than in the following species. 



The surface in all the specimens I have seen, is denuded of the 

 very thin epidermis. The remains of the latter to be seen in the 

 sutures show it to agree with Chloritis in being granulate. Young 

 specimens will doubtless be found to be hirsute. 



H. isis Pfeiffer. PI. 32, figs. 46, 47, 48 ; pi. 49, figs. 16, 17. 



Shell umbilicated, depressed, rather solid, striatulate, unicolored 

 chestnut ; spire scarcely elevated ; whorls 5, hardly convex, sensi- 

 bly increasing, the last subdeflexed in front ; periphery very obso- 

 letely angled ; base more convex ; aperture oblique, broadly lunar, 

 having a pearly luster inside ; peristome white, the margins scarcely 

 converging, upper margin subhorizontal, expanded, basal broadly 

 reflexed, shortly ascending at the insertion, partly closing the mod- 

 erate umbilicus by its dilation. (Pfr.) 



Alt. 19, greater diam. 45, lesser 38 mill. 



Admiralty Is. 



H. isis PFR. Proc. Zool. Soc. Lond. 1860, p. 133, t. 50, f. 8 ; 

 Malak. Bl. 1860, p. 237 ; Monographia Hel. Viv. v, p. 375 ; Novit. 

 Conch, iv, p. 113, t. 126, f. 1-5. 



Besides the unicolored chestnut form, specimens occur which are 

 brown with several broad darker bands or yellowish with broad 

 chestnut-brown bands (fig. 48). 



