103 Buda Limestone, Whitney 19 



anterior and posterior zones are alike, and consist of pairs of 

 small pores joined by line-like grooves. The space between the 

 two zones is equal to the width of the zones. Beyond the peta- 

 loid parts the pores are continued as distant pairs of small, rounded, 

 obliquely set pores which diverge rapidly toward the ambitus, 

 but converge below it toward the peristome. 



The posterior ambulacral areas are shorter than the others, 

 and are situated in deep grooves. The pore zones are composed 

 of pore pairs like those of the anterior areas. Beyond the peta- 

 loid parts, the pores are distant and minute on the upper surface, 

 but closer together and larger on the lower surface. 



The interambulacral areas are large and form crests about 

 the apical system. Of these, the most prominent is the posterior 

 crest. The lateral areas are divided into three distinct areas 

 formed by two more or less prominent crests which extend from 

 the apex to the ambitus. The surface of the test, with the excep- 

 tion of the petaloid parts, is covered with irregularly scattered 

 tubercles. 



The peristome is small, subpentagonal, and situated con- 

 siderably anterior of the center. 



The periproct is oval, and located in the upper part of the 

 posterior truncation. 



The fasciole is broad and prominent about the ends of the 

 petaloid parts. 



The apical system is of moderate size and located very slightly 

 in advance of the center of the test. The genital pores are large, 

 and so placed that the posterior ones are more separated than the 

 anterior. 



The madreporite is large and in the center of the system. 

 The oculars are pentagonal. 



Number of specimens: 6. 



Occurrence: Buda Limestone, lower division, Austin and 

 Manchaca, Texas. 



