240 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 29 



PAGE 



Crepicephalus iowensis (Owen) 207 



Fig. I. (Natural size.) Restored figures of entire dorsal shield based 

 on left half of a nearly entire specimen, and associated 

 cranidium and pygidium. U. S. National Museum, Cata- 

 logue No. 61630. 

 2. (Natural size.) Fragment of a thorax preserving 11 segments 

 with prolonged pleura. U. S. National Museum, Catalogue 

 No. 61631. 

 20, 2a'. (Natural size.) Broken cranidium with profile. U. S. 



National Museum, Catalogue No. 61632. 

 2&. (Natural size.) Pygidium with the outer border exfoliated. 

 U. S. National Museum, Catalogue No. 61633. 



Figures 20 and 2b are of material collected by Owen. 



2c. (Natural size.) Free cheek with long genal spines. U. S. 



National Museum, Catalogue No. 61634. 

 2d. (Natural size.) Small, nearly entire pygidium. U. S. National 



Museum, Catalogue No. 61635. 

 2e. (Natural size.) Hypostoma. U. S. National Museum, Cata- 

 logue No. 616^7. 

 2/. (Natural size.) Cranidium of the characteristic form as it 

 occurs in the Eau Claire sandstones. U. S. National 

 Museum, Catalogue No. 61636. 

 The specimens represented by figs, i, 2d, and 2/ are from (78a) 

 the Eau Claire formation, Eau Claire, Wisconsin. 



Those represented by 2, 2a-c, and 2e are from the Eau Claire 

 formation at Dresbach, Minnesota, opposite the mouth of Black 

 River. 



Crepicephalus texanus danace Walcott 214 



Figs. 3, z^^. (Natural size.) Broken cranidium and longitudinal pro- 

 file of the only specimen in the collections. U. S. National 

 Museum, Catalogue No. 61638. 



From locality 79d, Eau Claire formation, near Eau Claire, 

 Wisconsin. 



Crepicephalus texanus elongatus Walcott. .'. 214 



Figs 4, 4a. (Natural size.) Dorsal view and longitudinal profile of a 

 fragmentary cranidium. U. S. National Museum, Cata- 

 logue No. 61639. 



From locality 796, Eau Claire formation, i mile (1.6 km.) north 

 of Eleva, Wisconsin. 



