93 BUDA LIMESTONE, WHITNEY 



noncrenulate, mammillated, imperforate tubercles diverging 

 from the peristome in two rows on either half of the areas. In 

 the adradial rows there are from 7 to 8 tubercles, while in the medi- 

 an rows there are from. 4 to 5 tubercles. Each areola is bounded 

 by a wreath of fine crenulations outside of which there is a circle 

 of granules and warts. 



The peristome is small, roughly pentagonal, and without 

 notches. The ambulacral lips are twice the width of the inter- 

 ambulacral lips. 



The apical system is flush with the surface of the test, and 

 is composed of five genital and five ocular plates so intercalated 

 with the coronal plates that it is difficult to distinguish them. 

 The right anterior genital plate is larger than the others and is 

 spongy, containing the madreporite. The genital pores are 

 large and toward the outer ends of the plates. The surfaces of 

 the other plates appear to have been marked with longitudinal 

 ridges like those of the corona, but weathering has almost oblit- 

 erated them. The ocular plates are irregular in form. Some 

 appear pentagonal in outline while others do not, possibly owing 

 to their state of preservation. The oculars are perforated to- 

 ward their outer ends. The periproct is roughly pentagonal. 



This species closely resembles Codiopsis doma Agassiz, 

 but is not so elevated as that species and the sides are not so 

 straight and the proportions are not the same. Comparison 

 with a specimen from France indicates that the two are separate 

 species, although very closely related. 



Number of specimens: 1. 



Occurrence: Top of lower division of Buda Limestone, 

 Austin, Texas. 



Coitaldia rotula Clark 

 Plate IV, figures 1-10; Plate V, figures 1-2 



Dimensions. — Diameter, 24 mm.; height, 17.50 mm.; peris- 

 tome, 3.5 mm. 



Description. — Test of small or medium size, depressed, 

 circular in outline, melon shaped, the narrow ambulacral areas 

 standing slightly above the interambulacral areas. 



