PlA'I-E ^^. 



Tampsia chocoyensis Stephenson. Side view of the type pair of individuals 

 about three-fifths natural size, from the upper part of the Mendez 

 shale on Chocoy hacienda, 1* kilometers northwest of Omaha station. State 

 of Tamaulipas, Mexico. (E), anterior siphonal channel. The part of 

 the surface shown on the left-hand specimen is nearly the same as that 

 shown on the right-hand specimen, indicating considerable individual va- 

 riation in the strength of the surface features. Cat. No. .S2.500. U.S.N.M. 

 page 8. 

 18 



