MARYLAND GEOLOGICAL SURVEY 295 



" The most marked and important feature of this species is the exceed- 

 ing shallowness of the sinus or notch in the outer lip. The essential 

 characters of L. bicincta, as here identified and restricted, are (1) the 

 ventricose whorls, (2) the sharp and regular lines of growth, and (3) the 

 exceedingly shallow sinus in the outer lip and vertical direction of the 

 surface striae from the peripheral band downward." Ulrich and Sco- 

 field, 1897. 



Occurrence. STONES EIVER LIMESTONE. Old quarry at Chambers- 

 burg, Pennsylvania, and south into Maryland. The original types are 

 from the Trenton of New York, but the species is said to range from the 

 Stones Eiver to the Richmond. 



Collections. Maryland Geological Survey, U. S. National Museum. 



LOPHOSPIRA (RUEDEMANNIA) LIRATA (Ulrich) 



Plate LY, Figs. 5, 6 



LopJiospira (f Seelya) lirata Ulrich, 1897, Geol. Minnesota, vol. iii, pt. 2, 



p. 998, pi. Ixxii, figs. 56-59. 

 Ruedemannia lirata Foerste, 1914, Bull. Sci. Lab. Denison Univ., vol. xvii, 



p. 312. 



Description. " Hight 15 to 24 mm., apical angles 65 to 70, the 

 angle of the first three whorls usually a little wider. Volutions about 

 five and a half, ventricose, the carinae not greatly interfering with the 

 general roundness of their outlines. Peripheral band median, appearing 

 lower on the whorls of the spire, very slightly prominent, trilineate; the 

 lines of equal strength and elevation or the median one is a little weaker 

 and not as sharply defined as the margined ones. About midway between 

 the band and the suture lines a small ridge or carina divides the upper 

 slope into two flat or slightly concave spaces. Nearly the same distance 

 beneath the lower margin of the band in the typical form of the species 



we meet with the first and strongest of about eight revolving ribs 



Umbilicus exceedingly small, sometimes closed by a slight overlap of the 

 inner lip. Aperture subovate, rounded below and rather straight at the 

 inner side. Lines of growth sharp, thread-like, regular, either fine and 



