132 THE NAUTILUS. 



New Species. 



9. POTAMIDES SALTILLENSIS n. sp. PI. 8, figs. 1, la, lb, and Ic. 

 Shell medium, the largest specimen about an inch in length, 

 whorls nine. Most all the specimens being decorticated ; surface 

 marked with transverse lines which vary in intensity, also becoming 

 nodulous near the spire, generally the younger forms are cancellated 

 (fig. la). In mature specimens there are three revolving lines 

 above ; the uppermost one just below the suture, being nodulous or 

 spinose, this line continues to the base and becomes coarsely nodul- 

 ous, generally making a shoulder. The other lines are less promi- 

 nent and increase to 5 or 6. Suture deeply impressed, base coarsely 

 striated. Aperture ovate and smooth, slightly channeled above and 

 below (fig. 1 = normal form). Length of largest specimen is 

 24 m.m. and breadth of body whorl 9 m.m. 



REMARKS: Figure 1 largest. 



Figure la = young, 6 mm. in length. 

 Figure lb and Ic are variations. 



Resembles in a general way the Floridian Goniobases. Is related 

 to lagoon forms of the Bahamas. 



(To be concluded.) 



NOTES. 



NOTES ON AMMONITELLA LUNATA, CONRAD. A paper published 

 by Conrad in the Amer. Jour. Conch, in which he described and 

 figured two fossil shells from the John Day region in Oregon, seems 

 to have been overlooked by more recent writers on the same subject. 

 The one with which this paper deals was described as Planorbis 

 lunatus, and was collected by the Rev. Thomas Condon at Bridge 

 Creek, Ore. It was later redescribed and figured by Stearns as 

 Ammonitella yatesi praecursor, a comparison of the descriptions and 

 figures will leave no doubt of the two being identical. The syn- 

 onymy will stand as follows : Planorbis lunatus, Conrad, Amer. 

 Jour. Conch., VI, p. 315, pi. 13, fig. 8, 1871 ; Report of Geol. Sur. 

 P. 448, 1883 ; Gonostoma yatesi, Cooper, Bull. 18, Geol. P. 16, 1885 ; 

 Ammonitella yatesi praecursor, Stearns, Wash. Acad. Sci., II, p. 

 656, pi. 35, figs. 8-12, 1900; Science n. ser. p. 153, 1902; Bull. 

 Geol. N. C., p. 67, 1906. HARRY EDSON. 



