24 on some freshwater shells from new guinea, 



Explanation of Figures. 



Plate IV. 

 Fig. 1, and la. — Terebra Brazier i, Angas, slightly enlarged. 

 ,, 2, ,, 2a. — Terebra venilia, enlarged. 



) ' 



5, „ 5a. — JVassaperitrema, with side view and elevation 



of eosta enlarged. 

 7, ,, 7a. — Clanculus undatoides, enlarged, and view of 



base nat. size. 



On some Freshwater Shells from N. Guinea. 



By the Eev. J. E. Tenison- Woods, F.G.S., F.L.S., President 



Linnean Society, N.S.W., &c, &c. 



The following shells were placed in my hands for description 

 by the Government Geologist, Mr. C. S. "Wilkinson. They were 

 obtained by the missionary expedition to New Guinea. 



They appear to me to be new, but in such a large and variable 

 genus which already numbers over 500 species, it is rather 

 difficult to pronounce with certainty without a very complete series 

 of types for comparison. I note the species however, and give 

 them names ad interim. It may be mentioned that though all the 

 Australian Melanias are very wide- spread, some extending as far 

 as New Caledonia, none of them were found in this collection and 

 the general facies of the fluviatile molluscan fauna of New Guinea 

 is peculiar and diverges from the Australian and Pacific types. 



Melania daktulios. PI. 4, fig. 3. 

 M. t.parva, elongato-ovata, apiceacuto, sub-diapJuma, intense olkacea, 

 fere atra, hand nitente, anfr. Q>h, fnudeo, decoll.J vice convexis, obsolete 

 inter dum costatis, regulariter, distanter spiraliter striatis ; striis post 

 columellam crebris, tenuibus ; sntura hand impressa ; apertura integra 

 ovata, labro tenui, antice producto, columella inconspicuo. Long. 11, 

 lat. 5, long, spirse 6£. 



