492 NON-MARINE FOSSIL MOLLUSCA. 



PLATE 3. JURASSIC AND TRIASSIC T 



UNIO STEWARDI White. (Page 426.) 



FIG. 1. Outline of a left valve restored from fragments, natural size. 

 UNIO NUCALIS Meek & Hayden. (Page 426.) 



FIG. 2. Lateral view of a left valve slightly restored from a specimen a little crushed. 

 FIG. 3. Dorsal view of the same ; the right valve restored in symmetry with the left. 

 FIG. 4. Dorsal view of one of the originally figured types, slightly restored, the 

 specimen being a little crushed ; all natural size. 



UNIO CRISTONENSIS Meek. (Page 425.) 



FIG. 5. Right side view of Mr. Meek's most perfect type, natural size. 

 PLANORBIS VETERNUS M. & H. (Page 446.) 



FIG. 6. Lateral view, natural size, and the same enlarged; also, a transverse section 

 showing the number and shape of volutions. After Meek. 



VALVATA SCABRIDA M. & H. (Page 470.) 

 FIG. 7. Copy of original figure of Meek & Hayden. 



VIVIPARUS GILLIANUS M. & H. (Page 470.) 

 FIG. 8. Two views of the type specimen, natural size. After Meek & Hayden. 



LIOPLACODES VETERNUS M. & H. (Page 470.) 



FIG. 9. Two views of the type specimen, natural size. After Meek & Hayden. 

 NERITINA NEBRASCENSIS M. & H. (Page 457.) 



FIG. 10. Two views of the type specimen, natural size. After Meek & Hayden. 

 FIG. 11. Enlarged view of a portion of the surface showing the pattern of the color 

 markings. 



