1903. 



NATURAL SCIENCES OF PHILADELPHIA. 



759 



teeth, four being in one valve and two in the other. The adductor 

 scars are rather large, connected by an irregular pallial line. 



Alt. 5, length S.25. thickness of 1 valve 1.75 mm. 



This species was collected by Mr. Clarence B. Moore on the gulf side 

 of Crooked Island, Florida. The types are No. 83,876, A. N. S. P. 

 Prof. W. H. Dall kindl}- compared it with his species from the Florida 

 Pliocene. It is very near E. kurtzii Dall, but seems to be more 

 delicate, with stronger laterals and more evenlv rounded ends. 



Fig. 2, 



Fig. 3. 



Cuna dalli n. sp. Fig. 3. 



Shell subtriangular, ineciuilateral, purple in the center becoming 

 lighter near the edge, surface sculptured with concentric costse, ven- 

 tral margin smooth, adductor muscle scars rather large, hinge strong 

 and broad. The right valve has three cardinals, the anterior is long 

 and low, the central large and triangular, the posterior short and nar- 

 row, situated at the edge of the large ligament pit. In the left valve 

 the anterior cardinal is long and low, the curved central is smaller 

 than the central of the opposite valve, the posterior cardinal is a small 

 ridge at the edge of the ligament. I'allial line entire. 



Alt. 2.5, length 2.4, thickness of one valve .8 mm. 



The types of this species are No. 84,612, A. N. S. P. They were 

 collected by Mr. Moore at Indian Pass, Apalachicola Bay, Florida; 

 he also collected the same species at St. Joseph Bay and on the gulf 

 side of Crooked Island, off St. Andrew's Sound, Florida. 



This species is more rounded and inequilateral than Parastarte 

 triquetra Conr., and lacks the crenulation on the ventral margin. It 

 has a broader hinge than Gemma gemma Totten, but the surface 

 sculpture is very similar. It is more inequilateral than Cuna concen- 

 trica Hedley, but the hinge is similar. Cuna particula Hedley is more 

 rounded and truncate, with a slightly different hinge. 



