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Transactions Texas Academy of Science. 
Holaster simplex (Shumard), Fort Worth. 
Holectypus planatus (Roemer), Edwards Limestone. 
Pseudodiadema lexanum (Roemer), Comanche Peak Limestone. 
Some Crinoids are found, as, for instance, in the Edwards Limestone, 
bnt they are not numerous. 
4. Worms are found in the Austin chalk, Port Worth and Edwards 
Limestones, but they have been studied only in a general way. Some spe- 
cies have been described by Prof. Robert T. Hill and others, but there is 
yet much material to be worked up. 
5. Of the Molluscoidea, the Bryozoa are represented in the Port 
Worth, Del Rio and Edwards Limestones. They, too, have not yet been 
thoroughly studied. The Brachiopoda are represented by a Rhynchonella 
from the Fort Worth, a Terebratula from the Eagle Ford Shale, one 
from the Edwards Limestone, and T. Wacoensis from the Fort Worth 
Limestone. 
6. The Mollusca are best represented. Some of the most commonly 
known are: 
Lam ellib ranclis — 
Radiolites austinensis (Roemer), Austin Chalk and Ponderosa or 
Taylor Marl. 
R. rugosa (Griebel), Edwards Limestone. 
R. davidsoni (Hill), Edwards Limestone. 
Monopleura marcidi (White), Edwards Limestone. 
M. coralliochama (Stanton), Edwards Limestone. 
Spondylus hilli (Cragin), Del Rio Clays. 
Ostrea munsoni (Hill), Edwards Limestone. 
0. carinata (La.mark), Fort Worth Limestone. 
0. subovata (Shumard) Fort Worth Limestone. 
Exogyra arietina (Roemer), Del Rio and Shoal Creek formations. 
Lima wacoensis (Roemer), Fort Worth and Comanche Peak Lime- 
stone. 
Inoceramus deformis (Meek), Austin Chalk. 
Gryphcea wdshitaensis (Hill), Fort Worth Limestone. 
Mytilus tenuitesta (Roemer), Fort Worth Limestone. 
Trigonia emeryi (Conrad), Walnut Clay. 
Cardita (several species), Fort Worth Limestone. 
Pinna petina (White), Comanche Peak Limestone. 
Hippurites t exanus (Roemer), Edwards Limestone. 
Gasteropods — 
Turrilites brazoensis (Roemer), Fort Worth Limestone. 
Turrit ella seratim-granulata (Roemer), Fort Worth Limestone. 
Pleurotomaria austinensis (Shumard), Fort Worth Limestone. 
Cerithium bosquense (Shumard), Edwards Limestone. 
