PLATE IV 
Fig. 1. BYSSONYCHIA ROBUSTA Miller p 328 
Type of Ambonychia robusta Miller, No. 8816, in the Faber 
collection at Chicago University. A, right valve, chiefly 
interior cast (=Fig. 3 accompanying original description). 
B, left valve of same specimen. C, anterior view of a second 
specimen (=Fig. 3a accompanying original description). Base 
of Saluda member of Richmond group, at Versailles, Indiana. 
Fig. 2. ANOMALODONTA ALATA Meek p 326 
Right valve. Waynesville member of Richmond group, on 
Clifty Fork, west of Madison, Indiana. 
Fig. 3. ANOMALODONTA COSTATA Meek .....p328 
Type of Ambonychia costata Meek, No. 790, in the James col- 
lection at Chicago University. Left valve, with indication of 
posterior outline drawn from lines of growth on other specimens; 
the type exposes chiefly the cast of the interior. Possibly 
from the Arnheim member of the Richmond group at Cincinnati, 
Ohio, but the species ranges upward also into the Waynesville 
member of the Richmond. 
Fig. 4. MODIOLOPSIS VERSAILLESENSIS Miller p 331 
Left valve. No. 8791, in Faber collection at Chicago University 
(=Fig. 18 accompanying original description). Waynesville 
member of the Richmond group, at Versailles, Indiana. 
Fig. 5. LINGULA VANHORNEI Miller p 306 
Type, No. 8865, In the Faber collection at Chicago University. 
Largely exfoliated, showing parts of interior. A, pedicel valve, 
with shell retained toward beak and along right margin. B, 
brachial valve, with shell retained toward beak and along left 
half. Both flgures magnified 3 diameters and retouched so as 
to accentuate the details of the interior markings. C, vertical 
outline of shell. Waynesville member of the Richmond group at 
Versailles, Indiana. 
Fig. 6. LINGULA BROOKVILLENSIS nov. sp p 308 
A, pedicel valve; B, brachial valve. Both figures magnified 3 
diameters, and retouched so as to accentuate the details of the 
interior markings. C, vertical outline of shell. Found at 
Boundary Hill, along railroad, two miles west of Brookville, 
Indiana. Probably from the Arnheim member of the Rich- 
mond group. 
Fig. 7. CRANIA PERCARINATA Ulrich. p 317 
Enlargment of part of the striae crossing the upper valve of 
Crania percarinata, in order to indicate the former attachment 
of this type to the peripheral border of a Lophospira. Same 
specimen as that figured on plate VI of this bulletin. 
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