74 THE NAUTILUS. 



bly been adopted for greater safety ia the exposed tree tops ; to the 

 same end every superfluous atom of weight has been abandoned, 

 the shell reduced to the thinnest, and the reflected lip dispensed 

 with. Under the lens the apex is seen to be of one and a half 

 whorls, black or darker than the adult shell, smooth and subglobose. 

 Oblique growth lines are the predominant features of the adult 

 sculpture ; by flashing the shell in the sunshine under a lens, an 

 extremely minutely shagreen surface is perceptible in the gleam, and 

 here and there broken lengths are decipherable of engraved spiral 

 lines. Viewing the shells of these three species by transmitted light 

 the color markings are seen as translucent spaces in the opaque 

 shell. I should interpret these signs as indicating a descent from 

 an ancestor like naso and macgilUvrayi through a form very close to 

 hidwilli Pfeiffer. 



The minute almost imperceptible shagreen surface may represent 

 the coarse sculpture of 7iaso ; the evanescent spiral lines are tracea- 

 ble from the clear cut lines of macgiUvrayi through the fainter 

 sculpture of hidwilli Pfr., to their vanishing representative in hid- 

 willi. Cox. But the minute subglobose apex and especially the 

 translucent spiral color bands ally this group unmistakably with 

 Papidna. Admitting this, in default of anatomical examination, it 

 will be necessary to rename the shell hitherto known as Bulimus 

 hidivilli Cox, lest it should clash with that other Papuina described 

 by Pfeifler as Helix hidivilli. I therefore propose that in allusion to 

 its peculiar habits, it be henceforth called Papuina folicola. 



Between these leaf-dwelling Papuina of Queensland and Bulimus 

 mageni Gassies, of New Caledonia, I note a strong resemblance in 

 color, form and sculpture, but especially in their translucent color 

 bands. Until further research settles authoritively the position of 

 this species I would j^rovisionally class it with the foregoing. 



SAN PEDRO AS A COLLECTING GROUND. 



San Pedro, California, is remarkable for the number and variety 

 of recent and fossil mollusks. 



New forms and an unusual abundance of known species are con- 

 stantly being found. 



This is due in a great measure to the extension of the Government 

 breakwater, which has made changes in the sea currents near the 



