THE NAUTILUS. 



v i- ix- OCTOBER, 1895. No. 6 



ON THE AUSTRALASIAN GUNDL. \CHIA.' 



BY C. HEDLEY, F.L.8., 

 With note on American forms 

 BY H. A. PILSBKY. 



The eccentric shell of Gundlachia, one part shaped like a knife- 

 sheath, or rather a spectacle-case, plastered askew upon another 

 part like the shell of an ordinary fresh-water limpet, the creature's 

 external likeness and internal unlikeness to Ancylus, and the re- 

 markable, discontinuous, geographical distribution of the genus, 

 combine to tempt a naturalist's curiosity. For a chance to satisfy 

 such curiosity I am indebted to several friends who have liberally 

 assisted me with all the material and information at their command, 

 and without whose kindly aid I should have had to relinquish, mi- 

 profited, the study of the subject. Prof. Tate has kindly loaned me 

 the actual types of G. petterdi, and given me examples of that 

 species collected by himself at Mt. Lofty near Adelaide, S. Aus- 

 tralia. Mr. W. F. Petterd has liberally communicated a large 

 series of Gundlachia, including the actual type of his species G. 

 beddomei. Mr. C. E. Beddome has supplied me with a collection 

 of Gundlachia from various localities. Mr. H. Suter has convinced 



- ' From Vol. VIII (Series 2nd) of the " Proceedings of the Linnean Society 

 of New South Wales " (November 29th, 1893). We have omitted Mr. Hed- 

 ley's descriptions of the Australian species of Gundlachia and his plate illus- 

 trating them. ED. 



