230 Bulletin 31 330 



PLATK 29 

 Figure Page 



I. Venericardia planicosta \ ax. gamma '. 77 



Lisbon. See pi. 28 for exterior. 



2-8. Venericardia rotunda Lea 78 



Fig. 2, 18 mm., va.r. fungina, n. var. Claiborne. 



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



4, 19 " dorsal view. " 



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

 amental costse. Claiborne. 



6, 14 mm., var. approaching /ra/>a^«ara Har. Wautubbee. 



7, 12 " the same. Wautubbee. 



8, 22 " xax. JIabellum, n. var. Smithville. 



9, Venericardia {rotunda ?, var.) coloradonis, 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. Seep. 8i. 



