248 BUI.LETIN 31 348 



PLATE 47 



Figure Page 



1-3. Meretrix trigoniata l-i&a., typical, Claiborne 146 



Fig. 1 , 30 mm. 



2, 21 " 



3, 29 " 



4-6. Meretrix trig07iiata,v2ir. bastropensis^ n. var 148 



Fig. 4, 16 mm., Bastrop River. Texas State Mus. 

 5,4.5 " Sabine River. 

 6, 35 ' • Rio Grande. Texas State Mus, 



7. ''Caryatis exigua''' Conrad. (Copy). Claiborne. 20 mm 150 



8-11. dementia mercenaroidea h\A. , \)2.s& oi Q,\&\^oxn& Bluff 151 



Fig. 8, 39 mm. 



9. 32 " 



10, 32 " 



11, 28 " +. 



12-13. Gratelupia hydana Q.on., Claiborne 152 



Fig. 12, 50 mm. 

 13. 50 " 

 13 a, 52 " 



14, 15. Gmmna sandi-mauruensis, n. sp., Sabine River, 3.5 mm 152 



16-19. Marcia retisai/pia Claihorne 153 



Figs. 16, 17, 6 mm. 



18, 19, 4.5 " Aid. Coll. 



