Foerste.] 
276 
form. In Tennessee and Georgia, forms identified with Cornulites 
distans are found associated with adult, straight types of Cornulites 
serpularius and are very much more common than Cornulites distans 
in New York. Tentaeulites anglicus , Salter, occurring in the Llan- 
dovery rocks and, apparently much like Cornulites distans of 
America and scarcely to be distinguished from the same — if indeed, 
a Cornulites — might be considered the } r oung form of the straight 
varieties of Cornulites serpularius as found in Europe. 
What makes these suggestions more probable is the fact that 
the greatest amount of contortion in the curved form is near the 
base of the specimens and indicates that curvature is greater in 
the younger individuals and hence curvature may be looked for in 
the young of curved specimens. On the other hand small specimens 
of the straight varieties have been found in which the diameter is 
quite small, so small as at least to suggest that the 3 r oung might 
have been straight, and to make this view a little more probable 
than the suggestion that they also were curved. If both straight 
and curved forms be considered comparatively unimportant varia- 
tions from some curved young form, then we scarcely see in what 
the distinction between Cornulites serpularius as described by Eng- 
lish palaeontologists and Cornulites Clintoni of Hall would consist. 
If the straight adult forms of both the European and American 
forms be considered to be derived from comparatively straight 
young forms, and curved adult forms from curved young individ- 
uals, then it would be possible to call all the straight forms, large 
and small, Cornulites Clintoni , Hall, and the curved forms, Cornu- 
lites serpularius. If however, as seems to me more probable, the 
curved and straight forms are both specifically related, then the 
straight forms might still be maintained as a variety Clintoni , and 
C. distans probably suppressed. As we, however, can onty offer 
these as suggestions we must leave collectors more fortunately 
situated to determine the matter definitely. 
Cyrtoceras? subcompressum, Hall. 
(PLATE VII, FIG. 7.) 
The type specimen was found at Brown’s Quarry, west of New 
Carlisle, Ohio. The specimens found are all fragments. The 
outline drawing of the completed specimen is only conjectural, 
being taken chiefly from the published figure of Gyroceras Elrodi , 
White, of Indiana, in order to show, where in the complete speci- 
