19 

 Family CYCLONEMlDiE 



HOLOPEA GRANDIS, n. sp. 



Phife IT, Fif/. .9.9, bas(i\ view, shoivhuj the form of the mouth 



mid the open umhiliciis; Fi(]. :i4, hdcral view, 



one whorl broken off at the apex. 



Species very large. Shell about as high as wide. Volutions 

 large, ventricose, and increasing rapidly from the apex. Four vo- 

 lutions, regularly rounded externally. Sutures sharply defined. 

 Umbilicus open. Aperture rounded, subovate, somewhat flattened 

 on the inner side, where it is in contact with the preceding volu- 

 tion. Surface ornamented with larger and smaller revolving strire, 

 which are crossed by finer oblique lines that cancellate the shell. 

 On the l>ody whorl, the largest revolving ridge is above the pe- 

 riphery, and the lines from the suture are directed obliquely back- 

 ward to it, and then curve forward from it, and then backward 

 over the lower rounded side of the volution. 



This species cannot be classed with Pie»ro<oman'a, because there 

 is no notch in the aperture. It is not a Cyclonema, because it 

 has an open umbilicus. It agrees with tne generic characters 

 ascribed to Holopca, and for that reason it is referred to that 

 genus. There is no described species of Holopea so much re- 

 sembling it, that any comparison is necessary. 



Found by Geo. K. Greene in the Knobstone Group, uer New 

 Albany, Indiana, and now in the collection of Wm. F. E. Gurley. 



CYCLONEMA PULCHELLUM, n. Sp. 



Plate III, Fig. (>, lateral view of a specimen embeded in rock. 



Shell large, elongate, subglobose- conical. Height greater than 

 the width. Volutions six, the apex is broken off from the speci- 

 men illustrated. The volutions gradually expand from the apex 

 to the last one, which rapidly enlarges to a very ventricose whorl. 

 No umbilicus. The aperture is embedded in the rock, in 

 our specimen, but it is apparently subcircular. Suture sharp- 

 ly defined not canaliculate. There are three strong revolv- 

 ing carinas on each whorl, somewhat equally distant from each 

 other and the suture, on the smaller volutions, and without di- 

 verging from each other or leaving the suture, they all occur, on 

 the upper part of the ventricose whorl, above the peripherj-. 

 There are a few smaller revolving carina' that increase in number 

 and spread over the last ventricose volution. There are numer- 

 ous finer stri;c directed gently backward from the suture that 



