254 Bulletin 31 354 



PLATE 53 



P'igure Page 



I. CiiDiingia .^ keittensis, u. s,]-). (See pi. 52) 173 



Enlargement of a fragment of the cardinal area showing 

 the sharply defined submerged ligament, the lunule and 

 short, anterior lateral tooth. 



The laminar tooth in juxtaposition to the anterior margin 

 of the "pit" has been broken off below. It does not properly 

 form the anterior margin of the pit, a suture line intervenes. 



2,3, a. Spisula pariiis Qon., Claiborne 174 



Fig. 2, 15 mm. 

 3, 7 " 

 3a, 5.7 " 



4. S. parilis, y&r. bistriata Har., 18 mm., Sabinetown 174 



5-8. Spisula prtrteiutis Con., Claiborne 175 



Fig. 5, 34 mm., copy of Conrad's type figure. Phila. Acad. 

 6-8, 46 " Claiborne. 



9-12. S. prcsfetiuis, war. australina,n. var 175 



Orangeburg Dist., S. C. 

 Fig. 9, 42 mm. 

 lo-ii, 48 " 

 12,30+ " 



