Raymond : Gastropoda of the Chazy Formation. 189 



at Chazy. This species is usually more common than Lophospira rec- 

 tistriata. The figured specimens are in the Yale University Museum. 



Lophospira aspera (Billings). 

 (Plate LV, figure 2.) 

 Murchisonia asper Billings, 1859, Canadian Naturalist and Geologist, 

 Vol. IV, p. 458. 



This species was well described by Billings, but not figured. 

 Through the kindness of Professor Whiteaves and Dr. Ami, the writer 

 was permitted to study two of the typical specimens and a figure of 

 one of them was made. Billings' description is as follows : 



Description. 



" Obtusely conical ; apical angle about 70 , spire of four or five 

 whorls, the larger whorl large and ventricose, with a prominent band 

 about the middle and a low angular carina at about two-thirds the 

 distance between it and the suture above. The upper whorl small, 

 rapidly tapering to an acute apex, and altogether forming only one- 

 fourth or less, of the whole length. The band on the body whorl of 

 a specimen an inch and a half long is two lines wide, and consists of a 

 central rounded ridge one line wide and an obscurely angular carina 

 on each side. The surface is ornamented with fine sharp lines of 

 growth, about six to eight in the width of one line, which in descend- 

 ing, curve gently backward until they reach the band ; below which 

 they curve abruptly forward for about two lines, then become vertical, 

 or nearly so, and again curve backward on approaching the aperture. 

 They are thin, sharp, imbricated and very distinct. The aperture, as 

 exhibited in a single specimen, isnearly circular, the lower part some- 

 what effuse, the inner lip entire and a little separated from the body 

 whorl. 



" In some fragments of other specimens there appears to be a wide 

 but shallow concave band just below the principal band on the body 

 whorl, and below this there is an obscure carina. The main band 

 also varies a little in its proportional width and angularity. Owing to 

 the thickness of the shell the sutures above the body whorl are not 

 deep, and the upper whorls are, in consequence, not ventricose, but 

 still encircled by the band, apparently also with the upper carina. In 

 the cast the whorls are smooth, rounded, ventricose, and exhibit 

 scarcely any trace of either band or carina. In some specimens the 



