146 
BULLETIN OF THE LABORATORIES 
A specimen apparently identical with those on which the species 
was founded is somewhat better preserved than those previously fig- 
ured. The outline is nearly exactly that of Pterinea pintoensis, Wal- 
cott, but it is not covered by strong ridges as in that form and possess- 
es the external ligamental groove (?) It is very likely that our species 
belongs to Leptodesma or at least in that section of the Aviculidae. 
12. Allorisma cosfata, M. and W. (Plate XIV, Fig. 25.) 
We have thought best to illustrate the largest specimen of this 
species yet obtained, which it is hard to identify with the specimen 
figured in O. Pal. vol. II, Fig. 6, plate XIX. 
13. Myalina sp. Plate XIV, Figs, i, la.) 
This fine species was secured too late for study, but is perhaps 
new. 
14. Myalina ? sp. ? (Plate XIV, Fig. 24.) 
This species likewise is not identified, it resembles a Modiolopsis 
more than any carboniferous genus with which it has been compared. 
15. Nautilus forbesianus, McChesney, (Plate XIV, Fig. 13.) 
The fragment drawn is from Mr. Foerste’s collection and is suffi- 
cient to indicate the species. A very much larger species is also indi- 
cated by mere fragments. 
16. Goniatites (?) cf. G. iowensis^ M. and W. (Plate VIII, 
Fig. II.) 
The cast does not even show the presence of septa and the "gen- 
eric reference rests only upon a general resemblance in form to the 
very flat species quoted. 
17. Dentalium sp 2 (Plate XIV, Fig. 12.) 
This closely resembles D. canna, White, but has more oblique 
striations and aperture. Apically the longitudinal striations are strong, 
but toward the aperture they disappear and the concentric stri^ ap- 
pear. The section seems to be naturally oval, though the specimens 
are all somewat flattened. 
17, Conularia neivberryi, Meek (?) (Plate XIV, Fig. 14.) 
A fragment of a large Conularia indicates a fine large species with 
much finer striae than C. missouriensis, as figured in Pal. 111 . vol. 5, 
but agreeing well with the figure given by Walcott, under that name, 
but which should probably be identified with C. newberryi. The 
specimen is interesting because of the rarity — almost absence — of 
shells of this genus from the American coal-measure rocks. The cos. 
