EXPLANATION OF PLATE XXIII. 



TRK'iioTHdi'is Dalli Whitf. (p. 127). 



FiG.s. 1, 2. Two views of a small .speciintMi. 



',i,i. Similar views of oue of th« laifji^r shells. 

 AH twice natural size. 



SCALARIA MIILTI.STRIATA Sa.V (p. 126). 



Fig. .5. View of the only shell observed ; the surface is entirely exfoliated ; enlarged two diameters. 



TuRRiTELLA (Me.salia) pi.ebeia Say (ji. 130). 



Figs. 6,7. View,s of two fragments. 



8. Enlargement of the lower volution of the last, showing the surface striation. 



TuuitrrKi.i.A Citmbf:rlandia Conrad (p. 129). 



Figs. 9, 10. View of a specimen showing the upper part of the shell and an eulargement to show striae. 

 11. View of an older fragment, natural size. 



Ti'HKiTKLi.A .KijiLSTRiATA Conrad (p. 128). 



Figs. 12, 13. Views of two specimens presenting slight variations in rate of increase. 

 14. Enlargement from fig. 13 to show striae." 



TuRRiTELLA SECTA Conrad (p. 129). 



Figs. 15, 16. Views of two specimens, the latter preserving the striae in fairly good condition. 

 17. Enlargement from hg. 16. 



