DESCRIPTION, OF AVPERMIAN. CRINOID' FAUNA 
FROM TEXAS 
STUART WELLER 
- The crinoid fauna here described was collected by Professor 
J. A. Udden in Presidio County, Texas. The specimens are all 
from the lower brecciated bed of the Cibolo limestone? in the east 
bluff of Sierra Alta creek three miles north of Shafter and one-half 
mile below Cibolo ranch. ‘The fauna is of interest because it is the 
first prolific crinoid fauna described from the Permian of this country. 
The members of the fauna constitute an interesting assemblage of 
species, most of which belong to the family Encrinidae which is 
restricted in range to the late Paleozoic and the Triassic. The 
members of this family are characterized by the development of 
strong articulating ridges upon the distal faces of the radial plates 
and by the reduction and sometimes by the elimination of the anal 
plates in the dorsal cup. The only species here described which 
does not belong to this family is Hydreionocrinus uddeni, one of the | 
Poteriocrinidae also having strong articular ridges on the radials, 
but having a full quota of anal plates and a large ventral sack. 
Besides the species here described there are numerous detached 
plates in the collection which indicate the presence of nearly as many 
more species, and many crinoid columns of various sizes and forms, 
the largest of which attain a diameter of 4o™™ or more. 
In comparing the fauna with similar faunas in other parts of 
the world, mention must be made of the echinoderm fauna of the 
upper marine series of the Permo-Carboniferous of New South Wales? 
and that of the Productus limestone of the Salt Range in India. The 
species here described as Phialocrinus americanus must be compared 
directly with P. princeps Eth., from the Australian horizon, and, 
t Univ. Texas Min. Surv., Bull. No. 8, p. 20. 
2 Mem. Geol. Surv. N. S. W., “Paleontology,” No. 5, Part 2. 
3 Pal. Indica, Ser. XIII, Vol. I, pp. 822-34. 
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