248 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DESCRIPTION OF PLATE 36 p^GE 



Olenopsis roddyi Walcott 244 



Fig. I. (X3.) The type specimen of the species. The cephalon has 

 been compressed so as to shorten it and distort the glabella. 

 Original type presented by Professor H. Justin Roddy, 

 iMillersville, Pa., to the National Museum. U. S. National 

 Museum, Catalogue No. 58363. 



Olenopsis ? agnesensis Walcott 242 



Fig. 2. (X2.) A somewhat broken specimen showing the character 

 of the species. The free cheek terminates in a short spine. 

 U. S. National Museum, Catalogue No. 58364. 



The locality of the type is (35m) Mount Whyte formation {Al- 

 bertella zone), 3 miles southwest of the head of Lake Louise, on 

 east slope of Mount Whyte, Alberta, Canada. 



Olenopsis zoppii Meneghini 242 



Fig. 3. (Natural size.) View of a natural cast, showing the form of 

 the cranidium and thoracic segments. U. S. National 

 Museum, Catalogue No. 18304. 



4. (X2.S.) A nearly entire specimen, illustrating the general 



characters of the species. U. S. National Museum, Cata- 

 logue No. 58365. 



5. (Natural size.) Under side of a free cheek. U. S. National 



Museum, Catalogue No. 58366. 



6. (X 2.) A cranidium preserving the form of the glabella, fron- 



tal limb, and margin. The ridge crossing the frontal limb 

 at the center was caused by a break in the test. U. S. 

 National Museum, Catalogue No. 58367. 



7- (X3.) Enlargement of several of the falcate extensions of 

 the pleural lobe to show the surface markings of the under 

 side of the doublure of the pleurae. U. S. National Mu- 

 seum, Catalogue No. 18304. 



All of the specimens illustrating this species are from the locality 

 of Canal Grande, Sardinia. 



