Weno and Pawpaw Formations 95 



saddle and about three-fourths as broad. The second and third saddles 

 are taller than broad and rather angular in form. The remaining lobes 

 likewise are subquadrate and shallowly bifid. The internal suture has not 

 been examined. 



This species greatly resembles Acanthoceras martimpreyi Coquand 

 A. aumalense Coquand, and A. suzannae Pervinquiere, all from the Vra- 

 conian of Tunis. 



ASTEROIDEA 



The genera of Comanchean starfishes are in such great need of defini- 

 tion that it has been found impossible to assign the Texas species with 

 much certainty to the proper genera ; for in the absence of authentic ma- 

 terial of described species it is difficult to make such definitions fron< 

 figures and text alone. When the Texas starfishes are closely defined it 

 will probably be necessary to form new genera for certain of the species, 

 but in the meantime they have been provisionally assigned to known 

 genera, avoiding when possible those founded on recent species, on ac- 

 count of the great amount of subdivision which the recent Asteroideo 

 are receiving at the hands of modern workers. 



PENTAGONASTER TEXENSIS Adkins and Winton 

 PI. 7, fig. 7 



1920 : Pentagonaster texensis Adkins and Winton, Univ. Texas Bull. 1945, p. 47, pi. 10, 



figs. 5-6. 

 1920: Pentagonaster texensis Winton and Adkins, Univ. Texas Bull. 1931, p. 22. 



A recently discovered individual shows the superomarginal plates, and 

 the interior of the disk is eroded down to the oral surface, of which several 

 adambulacral, circumoral, and a few paramarginal plates are exposed. 

 All of the superomarginal plates are shown, but due to erosion and the 

 thinness of the disk, certain oral plates come into view, and there is over 

 the disk a resulting mixture of oral and aboral plates. This individual 

 was found in a limestone slab, face down, at the type locality described 

 below. 



HORIZON : Upper five feet of the Weno limestone. 



LOCALITY: 602, east slope of the valley of Sycamore Creek, four 

 miles southeast of Fort Worth, Texas, at a level 29 feet below the base 

 of the Mainstreet limestone. 



