230 Bulletin 31 230 



PLATE 29 

 P'igure Page 



I. Venericardia planicosta vax. _^ainma 77 



Lisbon. See pi. 28 for exterior. 



2-8. Venericardia rotunda Lea 78 



Fig. 2, 18 mm., \a.x. fungina, n. var. Claiborne. 



3, 20 " var. funiculus, n. var. " 



4, 19 " dorsal view. " 



5, 19 " showing characteristic serration of sub-lig- 

 amental costae. Claiborne. 



6, 14 mm. , var. approaching trapaquara Har. Wautubbee. 



7, 12 " the same. Wautubbee. 



8, 22 " \a.r. flahelluin, n. var. Smithville. 



9, Venericardia {rotunda f, var.) coloj-adonis, n. var., 

 21 mm., Smithville Tex. Whether this is more near- 

 ly related to the rotunda or alticostata forms we have 

 been unable to decide. See p. 8i. 



