TEESHWATER SHELLS OE AUSTEALIA. 297 



wborl proportionally larger, imd the sunken spire smaller ; umbi- 

 licus narrower ; internal lamellae none. 



Grreatest diameter 4 millim., smallest diam. 3|, height l-i. 



Sab. Victoria ; S. Australia. 



In colour and general aspect this species closely resembles the 

 preceding. On careful comparison, however, it proves to differ 

 in the particulars above referred to. It appears inconsistent to 

 place a shell in the genus Segmentina lacking the essential cha- 

 racter of internal lamellae. However, its tout-ensemhle is so Seg- 

 mentinoid, that I feel sure it is an abnormal form of that group. 



G-enus Ancxltjs. 



109. A^CTLrs AusTEALicus, Tate ? (Plate YII. figs. 36-37.) 

 Ancylus australicus, Tate ?, Trans. ^- Proc. Roy. Soc. South Australia, 



vol. iii. 1880, p. 102, pi. iv. fig. 4 a-b. 



Sab. North Austi-alia : collected during the Port-Essington 

 Expedition, October 14th, 1844. River Torres, Adelaide (Tate). 



The two specimens in the British Museum from North Aus- 

 tralia (vide figs. 36-37) appear to agree fairly with Mr. Tate's 

 description ; but a comparison with authentic examples of the 

 species will be necessary to prove their identity. 



Genus Neeitika. 



Of this genus, as far as I can ascertain, only two species 

 undoubtedly live in fresh water, namely iV. crepidularia and AT. 

 pulligera. 



110. Neeitika ceeptdtjlaeia, Lamarck. 



Eor the synonymy of this species see Martens, Conch. -Cab. 

 p. 37. 



Sab. "Inlet next to Percival Eay, fresh water" {Dr. Bichard- 

 son)', Port Essington {Capt. Wiclcham, B.N., and J. B. Jukes) ; 

 Swan Eiver {Brit. 3Ius.); swamp two miles north of Cardwell, 

 Queensland {Brazier). 0-Taiti {Lesson); Katow Eiver, New 

 Guinea, on trees and roots {Brazier, Broc. Linn. Soc. JW S. W. 

 1875, p. 22). 



111. Neettti^a pulliqeea, Linn., var. sulcata, Ten.-Woods. 

 Neritina puUigeva, Linn., var. sulcata, Ten.-Woods, Proc. Linn. Soc. N. 



S. Wales, ]S7S, in. p. 3. 

 Sab. In the mountain-streams of the Bellenden Kerr ranges, 

 North Queensland. 



