PIG AO I QIN 
MeErorcocERAs, VASCOCERAS. 
Wie, Ue) WOKCOGARaS NAD IBLE oo doo soca bcosonsodgcuesocecasasueasee keepeaeuseoseces 122 
Figs. 1,2. Exterior, natural size, showing living chamber nearly three-fourths of 
a volution in length, complete to its inner border. 
3. Lateral suture of the last septum, > 3. 
Elm Fork, Horton’s mill, Dallas County, Tex.; Colorado epoch. 
4,5. Specimen somewhat older than fig. 1, natural size. 
Probably from Texas; my collection. 
6. Lateral suture, X 3. Living chamber, probably nearly complete, is 
one-half of a volution in length. 
7,8. Type of species, natural size. 
9. Suture, natural size, somewhat older than fig. 4, whole diameter about 56 
mm. 
Elm Fork, Horton’s mill, Dallas County, Tex. 
10. Lateral suture, left side of fig. 4, Pl. XIII, taken from halfway between 
the base of the living chamber and the opening of the same. 
Hig se lela eMetoicocenas accelenaywmpely abe ee eee eee eee eee sener eee eee eee ere eee eee Wet Len 
Figs. 11-13. Specimen in which the living chamber is complete and over three- 
fourths of a volution in length, natural size. 
14. Part of suture visible at base of living chamber on the opposite side to 
that figured, > 4. 
Elm Fork, Horton’s mill, Dallas County, Tex. 
Bre. sn Metorcocenas whiten ely attenm see meses eee eee ee eee ee eee eee eee ee eee 122 
Dorsal suture, natural size. 
Elm Fork, Horton’s mill, Dallas County, Tex. 
Bree) Gs Wascocenastiucmttiy (ely att) ee Ue Ue s/t sey. yes Sy aie aN Se see eterna Cope etey Eee epee ape 103 
Suture, natural size. 
280 
