GASTROPODA. 975 



ra.) 



cloee to the umbilicus which is not SC.MI in I.. Hif<H>ili*. Hut the peculiarity chiefly 

 relied upon ia the unu.-ual fa.-t that the apical angle of the first four or five whorls 

 is only about 4'J . whilf with the last turn the angle is increased to quite 58; and 

 taking only the lust two volution* the angle is over 60. 



The markoil increase in the apical angle distinguishes this species from all 

 others now referred to Lopli.<i>ir. Aside from this feature L. perangulata agrees 

 nearly as well as L. mfdialis. Differing in the same manner as that species, the 

 ivr-im/nlita varies further in having constantly a carina beneath the peripheral one 

 of which no sign is to be seen on L. abnormis. 



Formation and loeattCy. Upper part of the Trenton group, Covlngti.n, Kentucky. 

 CWfaettm.-E. O. 



LornospiRA DBOURSA, n. tp. (Ulrich.) 



I'l.ATF. LXXI1I. KIO. 10 



Hight 2'J to 28 mm.; apical angle 40 to 44. Volutions about six; peripheral 

 anna situated unusually low, causing the slope of the upper side to be uncommly 

 steep; upper slope flat or with a slight swelling near the suture; concave space 

 between peripheral and lower carina' relatively narrow; no umbilicus. 



Near L. perangnlaia, but is a larger and relatively narrower shell, with the 

 peripheral carina lower and the concave space beneath it narrower. The absence 

 of an umbilicus is also distinctive. 



Formation and locality. Trenton group, Burgin, Kentucky. 

 CbUtetfM.-K. O. Ulrich. 



LOPHOSPIRA PRODUCTA, . 8p. (UlHck.) 

 PLATK \.\\\ 



Hi^'ht about 42 mm.; greatest diameter 18 mm.; apical angle about 32. Volu- 

 tions about ten, strongly angular, rather high, the upper slope rather wide, concave 

 to the suture except on the last whorl on which there is a slight thickening of the 

 upper edge (not a carina) causing a slight deepening of the suture as we follow it 

 down the spire; peripheral band prominent, rather thick, situated below the center 

 of the exposed part of the upper whorls, lower carina well developed, exposed on all 

 the volutions, its lower side forming the upper border of the suture line. I'mhilicus 

 open, comparatively large, the base of the shell rounding lc-s abruptly into it than 

 usual. Aperture rather high, straight upon the inner side, angular below; inner lip 

 comparatively thin. Surface marking- obscurely preserved in the specimen, 

 apparently as in L. perangulata. 



