236 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 35 page 



LingulcUa mnnsrnsis Walcott 232 



Fig. I. (Natural size.) Interior of a ventral valve, showing a trace 

 of the pedicle furrow. U. S. National Museum, Catalogue 

 No. 58342. 



2. (Natural size.) Matrix of the specimen illustrated by fig. r. 



U. S. National Museum, Catalogue No. 58342. 



3. (X2.) Interior of a ventral valve that appears not to have 



been distorted. (J. S. National Museum, Catalogue No. 

 58343- 



4. (X2.) Partly exfoliated ventral valve, that is somewhat 



broader posteriorly than the specimen represented by fig. 

 3. U. S. National Museum, Catalogue No. 58344. 



5. (X 2.) Imperfect interior of a dorsal valve. U. S. National" 



Museum, Catalogue No. 58345. 



6. (Natural size.) Interior of a dorsal valve shortened by com- 



pression. U. S. National Museum, Catalogue No. 58346. 



All of the specimens of this species are very much compressed 

 and flattened in the shale. 



Lingulella ? allani Walcott 232 



Fig. 7. (X3.) View of exterior of ventral valve and side outline. 

 U. S. National Museum, Catalogue No. 58347. 



8. (X4-) Exterior view and side outline of a broader form of 

 the ventral valve than that represented by fig. 7. U. S. 

 National Museum, Catalogue No. 58348. 



g. (X4.) View of exterior and side outline of a dorsal valve 

 associated with the specimen represented by fig. 8. U. S. 

 National Museum, Catalogue No. 58349. 



Obolus mollisonensis Walcott 231 



Fig. id. (X 3-) Exterior view and side outline of ventral valve. U. S. 

 National Museum, Catalogue No. 58350. 



II- (X3.) Partly exfoliated ventral valve, showing the thick- 

 ness of the shell. U. S. National Museum, Catalogue No. 

 58351- 



12. (X 3-) A somewhat distorted and exfoliated dorsal valve, 

 showing the area and central muscle scars. U. S. National 

 Museum, Catalogue No. 58352. 



