PLATE XII. 



PAGE. 

 SAJJDALODUS COMPLAXATUS, (N and. W sp.) 184 



Fig. 1 a. Manclibular posterior tooth, left ramus, outer extremity and posterior bor- 

 der restored in outline; 1 1> do., antero-lateral border; 1 c do., inner mar- 

 gin and transverse profile. Upper Burlington; Burlington, Iowa. Mr. 

 Wachsmuth. 



Fig. 2 a. Maxillary posterior tooth, right ramus, from above, partially restored in 

 outline; 2 b do., longitudinal profile from antero-lateral border. Upper 

 Burlington; Pleasant Grove, Iowa. Prof. Worthen. 



Fig. 3 a. Mandibular median tooth, left ramus, a large example from above; 3l> do., 

 postero-lateral border and longitudinal profile; 3 c do., antero-lateral 

 border; 3d do., inner-margin and transverse profile; 3 e do., outer ex- 

 tremity, mutilated; 3/ do., showing the concave inferior surface. Upper 

 Burlington; Louisa Co., Iowa. Mr. Springer. 



Fig. 4 a. A small example of the same form, seen from above; 41 do., longitudinal 

 profile from postero-lateral border. Same formation, locality and collec- 

 tion. 



SANDALODUS, sp ? 187 



Fig. 5 a. Mandibular posterior tooth, left ramus, from above, partially restored in 

 outline; 5 I do., longitudinal profile from antero-lateral border; 5c do., 

 from the postero-lateral border. Warsaw limestone; Warsaw, III. Prof. 

 Worthen. 



Fig. 6 a. Maxillary posterior tooth, left ramus, seen from above, outline partially re- 

 stored; 6 b do., longitudinal profile from antero-lateral border; 6 c do., 

 from outer extremity. Warsaw limestone; Piasa creek, above Alton. 

 Mr. Van Home. 



SANDALODUS SPATULATUS, (N and.jW. sp.) 188 



Fig. 7 a. Mandibular median tooth, left ramus, view from above, outer extremity 

 ^mutilated from wear; 7 6 do., longitudinal profile from postero-lateral 

 border; 7c do., antero-lateral border; 7 d do., transverse profile from 

 inner margin; 7e do., outer margin; 7/do., inferior surface. St. Louis 

 limestone; Alton, 111. Mr. Van Home. 



SANDALODUS L.EVISSIMUS, (N. and W.) 18G 



Fig. 8 a. Mandibular median tooth, right ramus, view from above of a very large ex- 

 ample, the great er part of the coronal surface excessively worn from 

 use; 8 b do., postero-lateral border; 8 c do., antero-lateral border; 8 d 

 do., inner margin; 8 e do., outer inrolled margin; 8/ do., inferior aspect, 

 showing inrolled outer extremity. Keokuk limestone; Keokuk, Iowa. 

 Mr. Cox. 



Fig. 9 a. A small specimen of the same form, left ramus, seen from above: 9 b do., 

 inner margin and transverse profile; 9c do., outer margin; 9 d do., an- 

 tero-lateral border; 9 e do., postero-lateral border and longitudinal pro- 

 file; 9/do.. inferior surface. Keokuk limestone; Keokuk, Iowa. Mr. 

 Van Home. 



