PLATE X. 



f\g. l.— Diplomt/Htus deHlatus. Two-thirds size. From Twiu Creek, Wyomiug. Page 74. 

 Fi<;. 2. — Diplomyatus analis. Natural size. From Twin Creek. Page 75. 

 Fig. 3. — Diplomyatus pectorosua. Natural size. From Twiu Creek. Page 76. 

 Fig. 4. — Uiplomyaiua humilia. Natural size. From Twin Creek. Page 77. 

 Fig. ."). — Diplomyatua allua. Natural size. From Twin Crock. Page 79. 



