APPENDIX. 303 



plane around the umbilicus. Aperture oblique, subhorizontal, 

 lunate-elliptical, livid violaceous-brown inside; peristome simple, 

 dull whitish, margins joined by a very thin violet-brown callus, 

 columellar margin subdilated, slightly reflexed, a little sinuous; 

 basal and outer margins thin, subacute. 



Alt. 20, greater diam. 46, Issser 38 mill. (C. & jP.) 



Diego-Suarez, Madagascar. 



H. Suarezensis C. & F., Journ. de Conchyl. 1877, p. 78 ; and in 

 Orandidier, Hist. Madag., Moll., t. 4, f. 2, 2a, 2b. 

 Belongs evidently in the vicinity of If. lanx Fer. 



H. LANCIFORMIS Boettger. 



H. lanx Crosse & Fischer (not Fe"r.), Moll. Madag. t. 11, f. 4, 4a. 

 4b, is doubtless synonymous. It is a distinct, well-marked species. 

 H. Campbelliana Pilsbry is perhaps a small variety of the same. 



HELICOPHANTA. 



Page 64, 12th line from bottom, read pi 66, fig. 63, instead of pi. 

 4, rig. 63. 7th line from bottom of page, read pi. 66, fig. 62, instead 

 of pi. 64, fig. 62. 



ACAVUS. 



ACAVUS H^MASTOMA L. var. CONCOLOR Pilsbry. (The Nautilus 

 iv, p. 59, September, 1890). Unicolored chestnut all over, the two 

 earlier whorls and a narrow umbilical crescent pink ; lip and parietal 

 wall red. No spiral white zones or bands. Form normal. (No 

 60959 of Acad. Colin.) 



HADRA. 



On page 88-89 I offered an arrangement of this group, which 

 I have found to be imperfect, after the whole of my material was 

 studied. The following arrangement is more in harmony with the 

 facts as I understand them. I especially would insist upon the 

 complete divorce of Hadra from Camcena, and the essential identity 

 of Thersites with the former. Upon this latter point I have al- 

 ready expressed my opinion (p. 129, this volume) ; I may add, that 

 since the passage referred to was printed, I have received a letter 

 from Mr. C. Hedley, the talented malacologist of the Queensland 

 Museum, in which he expresses the same view of Thersites. 



