608 TIMOTHY WILLIAM STANTON 
Comanche, 
Echinoids.......... Very abundant in several 
horizons 
Terebratula ....... Abundant in two beds 
Rhynchonella...... Absent 
OSTEICEDS Goo 040006 Immensely abundant and 
represented by Ostrea, 
Gryphaea, Exogyra, and 
Alectryonia 
MGM: co cococane Absent 
Pirigomiayyeere tcl Common 
IRWGLISS Gooncddc0c Abundant in Caprina Limest. 
Chamide ......... Abundant in Caprina Limest. 
Cyjomlineay ococ0b 0000 Very abundant 
Protocardia ....... Large species abundant 
Cyprimeria........ Abundant 
Naticidzenme joc Large species abundant 
Glauconia......... Abundant 
eiurnitellayeyoceren-rert Abundant 
INGMINEEs 6566000000 Abundant 
Acteonella........ Locally abundant 
Wy LO CET ASH ecier-ielcl ar: Absent 
Phylloceras ....... Absent 
lnloypobties coco bancée Rare 
Ancyloceras....... Absent 
Criocerasyecce ec Absent 
JElaNaaitis cooo oo0G00 Abundant in one bed 
Pachydiscus....... Abundant in one bed 
Schloenbachia..... Abundant in Fredericksburg 
and Washita divisions. 
Several species 
Engonoceras and 
related Ammon- 
ALES Pe rereexetaycverersyalt Common « 
Auriitesimeroeerery Locally abundant 
Belemmnitesee-e sce Absent 
Shasta. 
Presence barely indicated at 
one locality in the Knox- 
ville 
Rarely represented 
Locally abundant 
Very scarce. A small Ostrea 
in the Knoxville and 
Exogyra at top of Horse- 
town 
Immensely abundant in the 
Knoxville 
Common, species not closely 
related 
Absent 
Absent 
Rare 
One very small species of 
distinct type 
Absent 
One or two small forms com- 
mon 
Absent 
Very rare 
Occurrence doubtful 
Rare 
Abundant 
Abundant 
Common 
Common 
Common 
Absent 
Absent 
One species. Rare at top of 
Horsetown 
Absent 
Absent 
Common 
The comparisons cquld be carried further, showing many other 
genera that are found in only one of the areas, and that those 
occurring in both are not represented by closely related species. 
The two faunas are complements of each other, and both 
must be taken together to make up a really representative Lower 
Cretaceous fauna. 
Their differences agree in a general way 
with those that exist between the northern and southern 
