1892.] NATURAL SCIENCES OF PHILADELPHIA. 401 



elimiuated by me (Proc. Acad. Nat. Sci. Phila., 1890, p. 299 ; 

 The Nautilus, August, 1891, and Jour, de Conch. 1891, p. 22.) and 

 the genus restricted to its present limits. 



Genus ENDODONTA (Albers 1850) Pilsbry. 



Shell patuloid, with or without folds or denticles within the aper- 

 ture ; generally horn-colored with radiating or zigzag reddish 

 flames. 



Animal having a more or less developed caudal mucous gland," 

 and supra-pedal furrows. 



Genitalia unknown, but probably like Patula. 



Jaw thin, delicately ribbed (stegoguath) or striated. Central 

 and lateral teeth as in Patula ; marginal teeth low, wide, having 

 one or several short cusps ; rarely pseudo-zonitoid. 



Distribution, Oceanica, New Zealand, Australia. 



The elucidation of this group is involved in considerable confu- 

 sion. Albers and other early authors give shell characters only, in 

 defining their groups. Hutton first called attention to the anatomy 

 of species related to Endodonta, and to the fact that certain of the 

 New Zealand forms possessed a caudal slime-gland ; and he founded 

 a family " Charopidce " on this peculiarity, characterizing numerous 

 generic groups therein. Suter (Trans. N. Z. Institute, 1880-1892) 

 made certain modifications, and considerably enlarged the limits of 

 the family, the name of which he changed to " PheiiacohelicidceJ' 

 The writer made some observations upon the systematic position of 

 these groups in The Nautilus, Sept., 1892, and grouped all of the 

 mucous-pore bearing genera under the generic name Gerontia Hutt. 

 A month later proof-sheets of Mr. Charles Hedley's article upon 

 Charopidce were received at Philadelphia. This valuable paper 

 contained a synopsis of all previous publications known to the 

 author upon the subject, and the fact that E7idodonta,Pitys, Charopa, 

 etc., possess a mucous tail gland, like Gerontia, etc., was for the first 

 time brought forward. 



A brief review of Mr. Hedley's article appeared in The Nautilus 

 for October, 1892. Mr. Hedley does not give the same limits to 

 his Charopidce that the writer gave to Gerontia ; nor would it be 

 expected, as our papers, his in Australia and my own in America, 



''The credit of the discovery that the Patuloid forms (sucli as Charopa) herein 

 included posse=;>ed a caudal gland, rests with my friend Charles Hedley, of 

 Sydney, N. S. W., whose <jb ervations both printed and in letters have influenced 

 lars;ely the limits here given to this group. My former views are shown in the 

 " Obiervaiions on New Zealand Helices" in The Nautilus for Sept., 1892. 



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