ART. 21 TERTIAHY MOLLUSKS FROM FLORIDA — MANSFIELD 11 



Dimensions. — Cotypes (U.S.N.M. No. 371344) measure: Right 

 valve, length, 2.7 mm. ; height, 2.7 mm. Left valve, length, 2.7 mm. ; 

 height, 2.7 mm. 



Type locality. — Tamiami Trail, 42 miles west of Miami, Fla. 



Parastarte martensi appears to be more closely allied to the forms 

 that have been referred to the genus Parastarte than to those referred 

 to the genus Gemma. The concentric sculpture suggests the genus 

 GemTna. but the other features are more like those of Parastarte. 



