400 
CALLISTOCHITON ANTIQUUS MERIDIONALIS, n. sp. 
locality, New South Wales, wh as described under the 
name C. antiquus (pl. xlii., fig. 6 Reeve in 1847, and 
compare them with the Tasmanian shells and th Aus- 
Australian shell must receive a distinguishing name before 
the new Tasmanian shell can be put in its right niche in 
our classification. 
disarticulated. The anterior margin of the tegmentum is 
u 
tralian one it is produced forward almost to a point. The 
LY 
Australian Museum. 
CALLISTOCHITON ANTIQUUS MAWLEI, Iredale and May. 
_ This species was described from Port Arthur, South-east- 
ern Tasmania by Messrs. Iredale and May. It differs again 
. from either of the foregoing in that the longitudinal ribbing is 
S persistent. right over the dorsal area, the irregular network 
. present in the two former being absent. The longitudinal 
