38 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I45 



The posterior petals are straight in all the smaller specimens (pi. 14, 

 fig. 1), but curve posteriorly in all the specimens over 17 mm long. 

 There are no genital pores in any of the specimens less than 20 mm 

 long. 



13 1 

 12- 



II • 



10- 

 H 8- 



LU 



_] 



7- 



_J 





2 



6- 



z 





1- 



5- 



X 





o 





UJ 



4- 



X 







3- 





2- 





I- 



+ 



+ + 



+ 



-» 



10 20 30 40 50 60 70 80 90 100 110 

 LENGTH IN MILLIMETERS 



Fig. 32. — Encope tamiamiensis Mansfield. Height of test relative to length 



of test. 



Variation. — The posterior lunule is very variable in its outline 

 and size. In many of the specimens it is not symmetrical. Genital 

 pore 5 is eccentric to the right in most of the specimens. In a popu- 

 lation of 25, 23 of the specimens had an eccentric pore and in only 

 two was the pore not eccentric. 



