190 Annals of the Carnegie Museum. 



shell of the body whorl exhibits some deep, irregular undulations of 

 growth. 



"Resembles both Murchisonia helicteres Salter and M. bicincta 

 Hall, but these species have a distinct carina below the band. 



"Locality. — Mingan Islands, Canada. ' ' 



The type is in the Museum of the Geological Survey of Canada. 



Lophospira seelyi sp. nov. 



(Plate LV, figure 3.) 

 A small specimen of a species of Lophospira from Isle La Motte, 

 Vermont, differs considerably from all the preceding in its more 

 trochiform shape, the flattened slopes of the spire and the unusual 

 strength of the carina above the principal keel on the body whorl. 

 In many respects it resembles Lophospira quadrisulcata Ulrich and 

 Scofield, from the Richmond of Minnesota, but lacks the lowest carina 

 of the body whorl. 



Description. 

 Shell small, trochiform, consisting of about three whorls, the body 

 whorl making up three fourths of the height. Spire rather low, the 

 sides flattened. Body whorl large, angular, rounded below. The 

 principal carina, about the middle of the body whorl, bears a narrow 

 convex slit band. Below the principal carina is a wide, slightly con- 

 cave space, bordered below by an indistinct carina, below which the 

 shell is convex. On the body whorl, below the suture, there is a 

 narrow concave band bounded below by a strong carina. Below this 

 carina is a wider concave space which extends to the principal carina. 

 On the first concave band below the suture the surface is marked by 

 very coarse striae which curve gently backward. Below this carina 

 the striae are very much finer and turn more directly backward to the 

 slit band. 2 



2 Professor Ulrich, who has examined the type since the above was written, writes 

 me as follows : " This is a close ally of Lophospira obliqua Ulrich and Scofield, the 

 differences being (1) that the subsutural keel is a little further removed from the 

 suture in the Chazy species, (2) the band in the latter seems to be less distinctly 

 trilineate though this feature varies somewhat in L. obliqua, and (3) the periphery is 

 more prominent, so that in section the outline of the whorls is more sharply angular. 

 Lophospira bicincta and Lophospira helicteres agree better in these respects with 

 Lophospira seelyi, but in both the growth lines are sharper and much more regular, 

 while in L. helicteres the later whorls become vagrant. Lophospira aspera also 

 must be a close relative." 



