294 SYSTEMATIC PALEONTOLOGY 



Occurrence. BEEKMANTOWN LIMESTONE (Turritoma zone). Stouf- 

 ferstown, Pennsylvania, and east of Huyett, Maryland. Canadian 

 (Division G of the Quebec group), Port aux Choix, Newfoundland. 



Collection. TJ. S. National Museum. 



Genus LOPHOSPIRA Whitfield 

 LOPHOSPIEA BICINCTA (Hall) 



Plate XXXIX, Figs. 1-5 



Murchisoriia bicincta Hall, 1847 (not McCoy, 1844), Pal. New York, vol. i, 



p. 177, pi. xxxvili, figs. 5a-f (? 5g and 5h). 

 Lophospira bicincta Ulrich and Scofield, 1897, Geol. Minnesota, Pal., vol. iii, 



pt. 2, p. 964, pi. Ixxii, figs. 1-5. 



Description. " Hight 15 to 30 mm.; apical angle 59 to 63, usually 

 about 60. Volutions five or six, subangular; last one ventricose below, 

 tricarinate, the upper ones bicarinate, the lower carina being hidden by the 

 suture; central or peripheral angle margined on either side by a sharp 

 elevated line, with a narrow groove between, the angle, therefore, being 

 composed of three lines of which the central one is a little stronger and 

 more prominent than the lateral ones ; lower carina thin, abruptly raised, 

 the space between it and the peripheral angle scarcely concave and almost 

 perpendicular ; upper carina sharp, rather strong, removed a little more 

 than a third of the biconcave upper slope of the volution from the suture ; 

 aperture somewhat obliquely subelliptical, higher than wide, narrow 

 below, subangular at the lower inner corner ; inner lip but little thickened, 

 slightly twisted, never completely covering the minute umbilicus; outer 

 lip very slightly sinuate. Surface marked by fine, sharp, subequal striae, 

 curving backward very gently from the suture to the peripheral band; 

 beneath the latter they pass in a vertical direction to the lower carina 

 which scarcely interrupts their course to the umbilicus, near which only a 

 slight backward curve is noticeable. On the most perfect specimen seen 

 all the transverse lines present the appearance of being minutely papillose 

 or toothed, while the central line of the peripheral band is crossed by 

 straight lines, of which there are nearly twice as many in a given space as 

 of those coming from above and below. 



