70 PSEUDOCERATITES OF THE CRETACEOUS. 
City.* One has no living chamber, but is 290 mm. in diameter. This 
when complete must have been much larger than the second, which is over 
362 mm. in diameter. The living chamber was probably complete and was 
about one-half of a volution in length. The shell existed near the venter 
and showed a completely rounded venter; the first half of this outer volu- 
tion was still obtusely subacute, the tendency to roundness being present 
only on the last half. Hardly perceptible broad low folds, like those of 
smaller specimens, exist on the sides of the outer volution of both these 
fossils. The sutures are more complex than in younger specimens, but 
still have about the same elongated phylliform marginals. There is also 
in the Academy of Natural Sciences in Philadelphia a large fragment of 
this species. having smooth sides, but the specimen was not in hand for my 
final revision. The concavo-convex sides of the casts of this species and 
the broad outer forward curved folds are similar to the older stages of 
S. pleurisepta, but no tubercles were observed. The young, so far as I 
know, have not been described. 
A very interesting variation from Buncombe Hills, Pontotoc County, 
Miss., in the collection of Frederick Braun, of Brooklyn, N. Y., is shown on 
Pl. LX, fig.11. This has on the right side sutures quite different from those 
of other specimens figured. The diameter is about 155 mm. and the breadth 
of the side where suture is shown in Pl. LX, fig. 11, is about 85 mm. The 
first three saddles of the left side are given on PI. IX, fig. 12, for compar- 
ison with those on the left side of lobatus when the volution was about the 
same breadth. There were five divided saddles on both sides of this fossil. 
Locality: New Jersey, Mississippi. 
Age: Ripley group, Upper Cretaceous. 
SPHENODISCUS STANTONI n. sp. Hyatt. 
Pl. V, tig. 4; Pl. Vi, fig 5. 
This is founded upon two casts from locality No. 1473 (Coll. U. S._ 
Geological Survey). There is no distinction, so far as could be seen, to 
separate this from S. lenticularis except the sutures. These have, however, 
-so much broader and shorter saddles than any specimen of that species I 
have ever seen, that, if there is any specific distinction in such peculiarities, 
these forms can not be included in lenticularis. The same peculiarities, as 
«Not having had this fossil before me for revision, this opinion may be erroneous. 
