Dr. E. von Martens on Australian Species of Paludina. 255 



nearly twice as broad as long ; sides subparallel, slightly rounded, 

 narrowed and sinuate behind their middle ; surface smooth, im- 

 punctatc, the longitudinal sulcus interrupted in the middle, less 

 deeply impressed than the lateral fovea?, which are broader and 

 deeper, but ill defined. Elytra not very closely punctured, 

 nearly glabrous in the single specimen before me (which is, in all 

 probability, worn) ; the entire limb, with the exception of a small 

 space near the scutellum, narrowly edged with flavous ; basilar 

 space bounded beneath by a shallow depression ; running along 

 the outer disk, and bounded exteriorly by an indistinct ridge, is a 

 broad, shallow, longitudinal groove ; on the hinder disk near the 

 middle are also to be seen the traces of a second, very ill defined. 



XXIX. — On the Australian Species of Paludina. 

 By E. VON Martens, M.D., C.M.Z.S. 

 Only one Australian species is mentioned in the list of the 

 species of this genus given by Frauenfeld in the ' Verhandlungen 

 des zoologisch-botanischen Vereins in Wien,' 1863, as well as in 

 Reeve's ' Conchologia Iconica.' Having enjoyed the advantage 

 of examining some others in the British Museum and in the 

 Zoological Museum of Berlin, I shall here give comparative de- 

 scriptions of them. 



1. Paludina australis, Reeve, Conchol. Icon. 1863, no. et 



fig. 71. 

 Probably P. essingtonensis, Shuttleworth, Frauenfeld, /. c. 



p. 1162. 



P. testa conico-globosa, perforata, tenui, confertim spiraliter undu- 

 lato-striata, virescenti-cornea, fasciis rufo-fuscis 3-5 picta ; spira 

 gradata ; anfr. 5-6 inflati, sutura profunda distincti ; apertura 

 subperpendicularis, circulari-ovata, angulo supero modice acuto ; 

 peristoma interruptum, album. 



Altitude 38, diameter major 31, minor 25, aperturse altitude 21, 

 latitude 1 7 mill. 



Operculum normale. 



Australia ; collected by Mr. Gilbert at Port Essington. (B.M.) 

 Similar in size and form to the European P. vivipara, MiilL, 

 Lam. (P. Listeri, Forbes), but readily distinguished by its sculp- 

 ture being similar to that of some species of the Indian Archi- 

 pelago. The three principal bands occupy the same place as 

 those of the European species, or as the principal ridges in the 

 Indo-Chinese (P. angularis, MiilL, and P. costata, Q. & G.) ; but 

 in several specimens there are two additional bands, narrower 

 and paler, the one above, the other beneath the uppermost of 

 the three principal ones. 



