EXPLANATION OF PLATE XVIIL 



Fk;. 1. Cassiope VViiitfieldi. (Page 19;;.) 



a. Lateral view, sliowins; tbe umbilicus. 



l'"lO. 2. LlSPODESTHES I.INGULIFERA. (Page 192.) 



a. Specimen enlarged ; callus auJ test mostly exfoliated. This, however, sbows the volutiona 



of the spire aud tbe posterior canal, wbicb would otherwise be hidden. 



b. Outline of the same, uatnral size. 

 I'lii. :'.. Li.sroDESTiiES NUPTiALis. (Page 192.) 



«. Specimen, natural size ; test partially exfoliated. 



h. Same, enlarged. 

 Fig. '!. Anciiura ? kusifohmi.s. (Pago 190.) 



a. Natural size; test mostly removed by exfoliation. 

 Fig. 5. Admetoi'sis gregaria. (Page 19a.) 



a. Natural size, showing aperture and folds of the columella. 



h. Another examjile, enlarged. 

 Fig. G. Eulijiella eunicula. (Pago 197.) 



a. Specimen, a little enlarged, showing aperture and straight columella. 

 Fig. 7. Nehitina (Velatella) carditoiues. (Page 1S9.) 



0. View of upper side, natural size. 



h. Lateral view of the same. 



c. View of under side of the same, showing the broad inner lip. 

 Fig. 8. Axisomyon centrai.e. (Page 194.) 



a. Upper view of natural east of the iuterior ; summit broken off. 



h. Lateral view of the same. The specimen has been somewhat compressed vertically. 

 Fig. 9. Anisomyon rokealis. (Page 193.) 



a. Summit view. 



h. Lateral view of the same. 

 Fig. 10. TuRBOXiLLA (Chemnitzia) melaxopsis?. (Page 197.) 



a. Portion of tbe spire of au imperfect example. 

 Fig. 11. ToRiTELLA Uvasana. (Page 195.) 



a. Example cf ordinary size, broken at both ends. 



h. Portion of the surface of the last volntion of tho same. 

 ]"iG. 12. Lucina surundata. (Page 184.) 



a. Right valve. 

 Fig. 1;1. Idonearca depres.SA. (Page 183.) 



a. lliglit valve. 



h. Dorsal view of the same exami)li'. 

 Fig. 14. Leiopi.stiia (P-silomVa) Meekii. (Page ISG ) 



a. Natural east of right valve. 



/;. Kight valve, showing part of the fine surface-markings. 



'■. Loft valve. 



(/. Front view of a. 

 Fig. 1."). Leiopistiia (Cy.mella) uxdata. (Page 1^*7.) 



a. View of left v.alve. 



