718 CAMBRIAN BRA CHIOPODA— WAL COTT. vol. xix. 



DESCRIPTION OF TLATES. 

 Plate LIX. 



Page. 

 Fig. 1. Jiihidrn supcrhu 711 



1. Dorsal Aalvc. x 3. 



1 a. Summit view of ventral valve, x 6. 

 1 h. Pcsterior view of ventral valve, x 6. 



1 c. Side view of ventral valve, x 6. 



2. Iphidea logani 711 



2. Summit view of ventral valve, x 8. 



2 a. Side view of ventral valve, x 8. 



2 ft. Posterior view of ventral valve, x 8. 



3. Iphidea pealci 712 



3. Summit view of A'entral valve, x 6. 

 3rt. Side Auew of ventral valve, x 6. 



4. Iphidea crenisiria 713 



\. Summit view of ventral valve, x 6. 

 4 a. Side A'iew of ventral valve, x 6. 



4 ft. Posterior view of ventral valve, x 6. 



5. Iphidea alahamaensis 713 



5. Summit view of a compressed ventral valve, x 6. 



5 a. A small compressed dorsal valve, x 6. 



5 6. Enlargement of the surface side of a jjortiou of the surface of 

 fig. 5. 



Plate LX. 



Fig. 1. TorJiia wanneri, new species 715 



1. Exterior of ventral valve, with side outline, x i. From cast 



taken in natural matrix. 

 1 a. Natural cast of a ventral valve, with posterior view of area, x 3. 

 lb. Cast of interior of a ventral valve, Avith side outline, x 2. 

 1 c. Enlargement of jiosterior half of fig. Ih. 

 Id. Cast of interior of a dorsal valve, Avith side outline, x 2. 

 1 c. Enlargement of the area and posterior portion of the interior 



of a dorsal A'alve. From a cast taken in a natural matrix. 



2. A(Toihelc decipiens, new species 71(3 



2. Exterior of a Aentral Aalve. x 6. 



3. Torkia ? washingtouctisis, new species 715 



3. Natural semcast of the interior of a Aentral valve, x 4. 



4. Acrothele hellula, new species 716 



4. Exterior of a A'entral valA-e. x 6. Taken from cast in a natural 



matrix in a siliceous nodule. 

 4r(. Compressed ventral Aalve in shale, x 6. 

 4 b. Natural cast of the interior of a A-entral A-aU^e. x 8. 

 4 c. Interior of dorsal valve. Taken from a natural cast of the 



interior occurring in a siliceous nodule, x 6. 

 4rf. Natural cast of an interior of a dorsal A^alve. x 6. 

 4 e. Cast of the interior of a dorsal valve occurring in shale, x 6. 



