BY E. M. JOHNSTON, F.L.S. 



61 



considered merely as a provisional aid to students of 

 Tasmanian Conchology ; but it is hoped it may serve a useful 

 purpose until such time as a more complete work makes its 

 appearance. No doubt it is possible I have failed to notice 

 recent minor contributions which may have appeared in 

 foreign publications, and in the compilation from so many 

 sources, I may have allowed some errors to creep in, but I 

 think these are few and unimportant, and will not materially 

 interfere with its general usefulness. 



ARTIFICIAL KEY TO THE FAMILIES. 



I. MARINE UNIVALVES. 



GASTEROPODA. 



(1.) Shell regularly spiral. 



(a.) Shell fusiform, tapering to each end, moderately large. 



Large anterior canal, short, recurved, 



varices not more than 5 

 Canal straight, short, varices three or more 

 Canal usually straightish and long, no 



Tritonidse, viii. 

 Muricidse, vii. 



Fusidse, ix. 

 Buccinida3, x. 



Volutidffi, xii. 



Mitridse, xiii. 

 CancellaridEe, xvii. 

 Columbellidse, xvi. 



Shell notched in front, ovately fusiform 

 Shell with columella plaited, polished 



aperture, nearly as long as the 



shell, narrow 

 Columella plaited, aperture small, 



narrow, not exceeding half the 



length of shell 

 Columella plaited, aperture oblong, whorls 



cancellated, last one inflated 

 khell small, inner and outer lip crenu- 



lated interiorly 

 ohell small, somewhat ventricose and 



rugose, inner lip with a posterior 



shining callosity, or blunt denti- 

 form plait, anterior canal short, 



reflected truncate Nassidffi, xi. 



\°.) Shell convolute, the aperture nearly as long as the shell. 

 *Spire moderate, 

 kpire and columella lip covered with 



enamel, shining Olividse, xv. 



omall, collumela plaited, outer lip 



thickened in middle Marginellidse, xiv* 



omall, columella plaited, aperture, 



rounded in front Tornatellidse, liii. 



