250 SMITHSONIAN MISCELLANEOUS COLLECTIONS • VOL. 64 



DESCRIPTION OF PLATE 34 



PAGE 



Lonchocephalus pholus Walcott 194 



Fig. I. (X4-) Interior of cranidium. U. S. National Museum, 

 Catalogue No. 61699. 

 la, la'. (X4-) Exterior of cranidium and side outline. U. S. 



National Museum, Catalogue No. 61700. 

 lb. (X4-) Cranidium preserving relief of glabella and strong 

 occipital spine. There is also a cranidium of Norwoodia 

 tcncra on the same piece of limestone. U. S. National 

 Museum, Catalogue No. 61 701. 



Lonchocephalus plena Walcott I94 



Fig. 2. (X6.) Dorsal view and side outline of a broken cephalon. 

 U. S. National Museum, Catalogue No. 61702. 

 2a. (X6.) A cranidium preserving the glabella and fixed cheek. 

 U. S. National Museum, Catalogue No. 61703. 

 The specimens represented by figs, i, la-b, 2, and 2a are from a 

 shaly limestone, (son) Upper Cambrian : Weeks formation. House 

 Range, Utah. 



Lonchocephalus chippezvaensis Owen. (See pi. 37) igo 



Fig. 3. (X2.) Surface of sandstone with cranidia and pygidia. A 

 cranidium of Pagodia thca Walcott and fragments of 

 Hyolithes primordialis Hall occur in the sandstone. (See 

 plate 37-) 

 3a. (X6.) A nearly entire dorsal shield with the weathered sur- 

 face restored from other specimens. U. S. National 

 Museum, Catalogue No. 61704. 

 The specimen represented by fig. 3 is from locality 98, Upper 

 Cambrian : Eau Claire formation ; near Eau Claire, Eau Claire 

 County (collected by Dr. Samuel Weidman, and now in collection 

 of Geological Survey of Wisconsin at Madison) ; that represented 

 by fig. 3a is from locality 82, St. Croix Falls, Polk County; both 

 in Wisconsin. 



Lonchocephalus minutus (Bradley) I93 



Figs. 4, 4a. (X3-) Dorsal and side views of a convex cranidium. 

 U. S. National Museum, Catalogue No. 58566. 

 4>. (X3-) Associated free cheek. U. S. National Museum, 



Catalogue No. 58567. 

 40 4d. (X3-) Dorsal and side views of a crani<lium preserving 

 the anterior rim and border. U. S. National Museum, 

 Catalogue No. 58568. 

 4^, 4/. (X3-) Dorsal and side views of a pygidium from which 

 "the test has been exfoliated. U. S. National Museum, 

 Catalogue No. 58569. 

 AS- (X 3-) Dorsal view of a pygidium preserving the test. U. S. 

 National Museum, Catalogue No. 58570. 

 The specimens represented by figs. 4, ^a-g are from locality 77, 

 Upper Cambrian : Potsdam horizon ; sandstone near the water 

 below the falls at the high bridge, and also at several horizons in 

 the section, the highest point being 70-75 feet (21.3-22.9 m.) above 

 the water in Ausable Chasm, Essex County, New York. 



The above illustrations are taken from Smithsonian Miscellaneous 

 Collections, Vol. 57, 1914, pi. 43, figs. 21-24. 



