46 THE NAUTILUS. 



Mr. E. A. Smith in his report on the Land and Freshwater Shells 

 of the Challenger Expedition. 



19. Potamopyrgus brevior Anc. 



Testa parva, oblongo-attenuata, nitidula, pallide cornea, fere im- 

 perforata, lineis incrementi indistinctis, indumento ferrugineo tecta. 

 Spira sat producta, conoideo-attenuata, obtusula. Anfractus 5 con- 

 vexiusculi, sutura impressa, ultimus oblongus, infra altenuatus. 

 Apertura recta, imo basi antice leviter provecta, oblique oblongo- 

 ovata, basi ad sinistram distincte prodiens, supra attenuata, margini- 

 bus continuis, externo subobtusato. 



Long. 2^, diam. l, alt. apert. 1 mm. 



Hab. Vate Island (fide Layard). 



Very near to P. whiteleggei Braz., from Lord Howe's Island, but 

 with shorter spire. This is the first record of the genus in the New 

 Hebrides. Only one specimen was seen. The genus is also found 

 in the Viti group, and I have from them a very closely allied species. 



20. Melania setosa Swains. 

 Hab. Aurora Island (Layard). 



21. Melania mauiensis Lea. 

 Hab. same island (Layard). 



22. Septaria suborbicularis Sowerby. 



Mr. Layard wrote me he procured one specimen nearly 2 inches 

 long. 



Hab. Aurora Island. 



A FOSSIL FORM OF OREOHELIX YAVAPAI, PILSBRY. 



BY T. D. A. COCKERELL. 



Oreohelix yavapai compactula, n. subsp. 



Shell compact ; spire elevated, pyramidal ; last whorl somewhat 

 gibbous above, with a strong cord-like keel extending to the aper- 

 ture; shell with coarse, oblique striae, especially prominent on the 

 last two whorls above, and also with fine spiral lines, most prominent 

 on the last whorl, where they are more or less beaded; sometimes the 

 spiral lines are scarcely apparent, but this is probably the result of 

 weathering. Five specimens, two with the spire broken ; the dimen- 

 sions are : 



Max. diam. 13, 12, 11, 13, 12 mm. 



