286 RECORDS OF THE AUSTRALIAN MUSEUM. 



JJab. — East Coast. Near the sea on trees and bushes. It is 

 gregarious and very plentiful, but only known as from the east 

 coast. 



Subgroup AGNATHOMORPHA. 



Family RHYTIDID.K. 

 Genus Rhytida, Albers, 1860. 



Rhytida lampra, Reeve. 



Helix lampra, Reeve, Conch. Icon., vii., 1854, pi. clxxxvi., 

 sp. 1295. Id., Pfeiffer, Proc. Zool. Soc, 1854 (1855), p. 53. 



Rhytida lampra, Hedley, Proc. Linn. Soc. N. S. Wales, (2), vi., 

 1893, p. 23, pi. ii., f. 8, 9, pi. iii., f, 3. 



Jf,ib. — Confined to the northern portion of Tasmania. 



Rhytida lamproides, Cox. 



Helix lamproides, Cox, Proc. Zool. Soc, 1867, p. 722. Id., Cox, 

 Mon. Austr. Land Shells, 1868, p. 28, pi. x., f. 13. Id., 

 (Patxda), Cox in Legrand, Col. Mon., 1871, sp. 7. Id., 

 Petterd, Mon. Tas. Land Shells, 1879, p. 3. 



Hah. — This species is very distinct from all others found in 

 Tasmania ; it is strictly confined to the north-western scrubs 

 where it is not uncommon. At the Montague River it reaches 

 its maximum size, being but little inferior to H. launcesloneusis 

 in this respect. The specimens that Dr. Cox had under review 

 were but half-grown. 



The bluntly angular periphery is very characteristic. 



Rhytida ruga, Cox. 



Helix ruga, Cox in Legrand, Col. Mon., 1871, sp. 24, pi. i., fig. 5. 

 Id., Petterd, Mon. Tas. Land Shells, 1879, p. 7. 



Obs. — This is easily separable from the last and preceeding by 

 its constant smaller size and sculpture. It is absolutely distinct 

 and need not be confused with any of its congeners. 



Hah. — North, south and east coasts, always io dry positions in 

 open forest, and usually under stones. 



It is not known from the western portion of the island. 



