281 



1912) as Ischnochiton grei/i, Filhol, and which had be^n sent 

 to Mr. Suter and identified by him as his New Zealand shell, 

 /. fulvus, both the foregoing names beng synonyms for 

 campbelli, Filhol. I compared it with this species, with which 

 it certainly does not agree, and my note goes on to say, "This 

 is really Ire. and May's I. atkinsoni, as the scales correspond 

 with that species." It is just possible that it may be one of 

 these larger juveniles of H. cariosus, Pilsbry. It is certainly 

 referable to one or the other of these two species. 



Summary. 



Name. 



Ischnochiton lineo- 

 latus, Blainville 



7. lineolafus crispus, 

 Reeve 



I. atkinsoni, Ire. 

 and M«iv 



Heterozona suh-viri- 

 dis, Ire. and May 



Ischnochiton atkin- 

 soni lincolnensis, 



Ashby 



I. auratus, Ashby 



Heterozona cariosus, 

 Pilsbry 



Ischnochiton (Hetero- 

 zona) pi'operensis, 

 Ashby 



Habitat. 



Gulf St. Vincent. 

 S. Austr., to San 

 Remo,Vict.; north, 

 east,. and south coast 

 Tasmania to River 

 Derwent 



Bulli, N.S. Wales, to 

 Caloundra, Q'land 



North, east, and 

 south Tasmania 



Tasmania and Vict. 



From Wilson Pro- 

 montory, Vict., to 

 Esperance Bay, 

 W. Austr. Takes 

 the place entirely of 

 lineolatus westward 

 of Port Lincoln 



Gulf St. Vincent and 

 Venus Bay, S. 

 Austr. 



Tasmania, Victoria, 

 S. Austr., and W. 

 Austr. 

 Pt. Lincoln, S. Austr. 



Distinsjuishing 

 Characters. 



Large scales on girdle 

 with broad, much- 

 raised fluting 



Rather smaller scales, 

 fluting narrower 

 and less raised 



Small, finely-striated 

 scales, decussate 

 (sculpture very 

 strong 



Juvenile shell arch- 

 ed, dorsal area 

 smoother, scales 

 small, finely striate 



Scales similar to fore- 

 going, dorsal area 

 smoother, decussate 

 sculpture generally 

 less strong 



Scales minute, prac- 

 tically smooth, 

 orange, highly 

 polished 



Juvenile shell arched, 

 not carinated 



Scales medium size, 

 finely striated, 

 erect, decussate 

 sculpture rather 

 coarser than lin- 

 colnensis 



