Weno and Pawpaw Formations 103 



SALENIA sp. 



A large flattened Salenia, resembling in form S. mexicana Schltiter, 

 which is not known to range so high, was found in the basal stratum of 

 the Weno formation, just on top of the Gryphea washitaensis shell con- 

 glomerate of the Denton marl, by the St. Louis and San Francisco Railway 

 track, two and one-half miles north of Denison, Texas. 



The following are some of the features of this individual: There are 

 about 20 pairs of ambulacral tubercles, obliquely situated ; the ambulacral 

 lips are considerably wider than the inter-ambulacral lips ; the apical sys- 

 tem ("cap") is large, the plates ornately scalloped; the sutures are widely 

 and irregularly excavated. . ^ 



Salenidae have so far been found at the following levels in the Texas 

 Comanchean : 



Buda: S. volana. 



Grayson: Peltastes sp.: Goniophorus sp. 



Mainstreet: . 



Pawpaw: Peltastes? sp., Salenia volana. 



Weno: Salenia sp. aff. texana. 



Denton: Goniophorus sp. 



Duck Creek marl: Goniophorus sp. 



Duck Creek limestone: Salenia sp. 



Goodland limestone: Salenia mexicana, S. texana, Salenia n. sp. 



Walnut: S. mexicana; S. n. sp. 



Glenrose: Salenia n. sp. 



CYPHOSOMA VOLANUM Cragin 



This widespread Upper Washita species is occasional in the Weno form- 

 ation, marl facies, in association with a considerable echinoid fauna and 

 other fossils, such as Turritella worthensis, Venericardia worthensis, 

 Remondia ? acuminata and Ancycloceras bendirei. It is known otherwise 

 from the Weno to the Buda limestone. 



HOLECTYPUS LIMITIS Bose 



This species is distinguished from Holectypus planatus Roemer by hav- 

 ing the periproct in length about half the radius of the test and situated 

 about halfway between the centrally located peristome and the ambitus, 

 while the Holectypus planatus the periproct occupies almost the entire 

 length between the peristome and the ambitus. This species, described 

 from subdivision 5 of Cerro de Muleros (Duck Creek and Fort Worth 

 formations) occurs in the Upper Washita beds of North Texas as 



