10 THE NAUTILUS. 



whorl below the suture. The base appears to be smooth, canal 

 twisted. Length of fragment 7 mm., breadth of basal whorl 2^ mm- 



Locality : Wood's Bluff horizon six miles east of Thomasville, Ala. 



Remarks : This species has a general resemblance to Cerithiopsis 

 ftuviatilis Aid., but differs in the position of the raised spirals. 

 MATHILDA ELONGATOIDES n. sp. PI. 1, fig. 6. 



Shell small, exceedingly narrow and elongated, whorls about four- 

 teen, wfll rounded, carrying three nearly equidistant strong spirals 

 on the main part of each whorl and also a slight one just below the 

 suture. The longitudinals between the spirals are numerous and 

 close set, and rather fine. Body-whorl at base shows several spirals 

 in addition to those above mentioned. Aperture nearly circular. 

 Apical whorls reversed. Length 6 mm., breadth of body-whorl 1 mm. 



Locality : Wood's Bluff, Ala. 



MATHILDA SINGULARIS n. sp. PI. 1, fig. 11. 



Shell small, whorls profusely ornamented ; number of whorls five, 

 besides the embryonic apex ; apical whorls twisted and pointed hori- 

 zontally or at right angles to the axis of the shell. The main whorls 

 are angulated by a very strong peripheral line with a smaller one 

 above, and from one to two still finer ones between. Body-whorl 

 shows several (about four) fine spirals below the central one, extreme 

 base nearly flat. Aperture ovate ; pillar lip reflected, and slightly 

 prolonged into a canal. 



Locality : Wood's Bluff, Ala. 



MATHILDA LEONA Aldrich. PI. 1, figs. 4, 5. 



This species was described from the Wood's Bluff horizon. The 

 present specimen is from the Matthew's Landing beds, one mile west 

 of Oak Hill, Ala. The original description was drawn from a young 

 shell, and in this example the embryonic whorls are twisted to the 

 left and the spire projects horizontally. This specimen also shows 

 a small umbilicus. 



SCALA VETUSTA n. Sp. PI. 1, fig. 9. 



Shell as figured, number of whorls unknown, but four showing in 

 type ; they are rapidly expanding and ornamented with about twenty 

 raised ribs; suture defined with a strong carina which makes a raised 

 and angulated boundary for the base ; the ribs continue over this 

 line, and disappear into a deep and wide umbilicus. The spiral 

 lines do not show upon the base. The figure is natural size. 



