Freshwater- Shells of tlto Louisiade Archipelago. 205 



21. Pupinella Macgregori. (PL XIII. figs. 1, 2.) 



Testa P. gratidl maguitudine, colore, forma et sculptura fere similis ; 

 labrum pallidum vel liavescens, superne anguste persectum, 

 incisura extus supra regiouem umbilici tubulum formante. 



Longit, 29, diam. 15 millim., apertura intus 7 longa et lata. 



Ilab. Eossel Island. 



This species is in general character also like P. grandis. 

 It has, however, a somewhat shorter and broader aspect and 

 is perhaps a little more strongly pitted upon the back of the 

 body-whorl ; it is, however^ at once distinguished by the 

 peculiarity of the labial slit, wdiich is formed into a distinct 

 tube over the umbilical region. In P. grandis and. P. louisia- 

 densis the slit is transverse to the lip ; in the present species 

 it is almost perpendicular to the axis of the shell and higher 

 up than in the other species referred to. 



22. Piqyinella rosseJiana. (PI. XIII. figs. 5, 6, 6 a.) 



Testa P. graadl paulo minor, brevior, colore et sculptura subsimilis ; 



incisura labri fere obsolcta ; labrura minus incrassatum, antice 



prominens. 

 Longit. 25., diam. 13g millim., apertura 7 longa et lata. 



The smaller size and the almost obsolete notch in the 

 labrum readily separate this species from the rest. These 

 characters are quite constant in the sixty specimens examined. 



The young shell, consisting of five whorls, is Ojjenly and 

 perspectively umbilicated and has no ridge around the umbili- 

 cus, as in the adult form. 



1 have examined the opcrcula of P. grandis^ P. rosselianay 

 and P. Macgrtgori, and observe that they all present trifling 

 differences. 



23. Pupinella minor. (PL XIII. figs. 7, 8.) 



Testa pupiformis, sublasvis, sordide albida (vel pallide rubida ?) ; 

 anfract. G, regulariter crescentes, ultimus oblique deiscendens, 

 supra apertura subplauatus ; perist. incrassatum, reflexum, mar- 

 giiie columellari augustissime persecto, incisura supra umbilici 

 regionem tul)ulum irregularem formauto. 



Longit. ]9, diam. 9 millim., apertura intus 5 millim. longa et lata. 



IJab. ftossel Island. 



This is a smaller species than /'. J naasi, with a labial slit 

 somewhat resembling timt of J\ j\la-:aregori. The siugle 

 specimen at hand is in worn condition, so it is impossible 



