432 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



DESCRIPTION OF PLATE 55 



PAGE 



Corynexochus spinulosiis Angelin 323 



Fig. I. (X4-) Cranidium. 



la. (X4-) Side view of cranidium represented by fig. i. 

 lb. (X4-) A small pygidium associated with cranidia of this 

 species. 

 The above figures are from Gronwall, plate 4, figs. 3a, 3b, who 

 illustrated the type specimens of Angelin, which are now in the 

 Museum at Stockholm. They come from the Paradoxides forch- 

 hammeri zone, Andrarum limestone at Andrarum, Sweden. 



Corynexochus bornholmicnsis Gronwall 313 



Figs. 2, 2a. (X4-) Dorsal and side views of the typical cranidium. 

 2b. (X4-)- Pygidium associated with the cranidium represented 

 by figs. 2, 2a. 

 The above figures are from Gronwall, plate 4, figs. 10, ib, 2. The 

 type specimens are in the Mineralogical Museum [at Stockholm?]. 

 They came from the Agnostus nathorsti zone of the Middle Cam- 

 brian limestone of Bornholm Island. 



Corynexochus delagci Miquel 3'^7 



Fig. 3. (X4-) Cranidium laterally compressed and distorted. U. S. 



National Museum, Catalogue No. 62715. 



3a. (X4-) Pygidium compressed and distorted. U. S. National 



Museum, Catalogue No. 62716. 



The specimens represented by figs. 3, 3a are from locality I52d, 



Middle Cambrian : calcareous shale of Coulouma, Herault, France. 



Corynexochus clavatus (Walcott) 316 



Figs. 4, 4'. (X6.) Dorsal and side views of the type specimen of 

 cranidium. U. S. National Museum, Catalogue No. 174540- 

 4a. (X 12.) Diagrammatic figure based on several specimens of 

 the cranidium. This figure is the same as that published in 

 1887, American Jour. Sci., Vol. 34, plate i, fig. 3 ; idem, 1891, 

 Tenth Ann. Kept., U. S. Geol. Surv., plate 98, fig. 4- 

 4&. (X6.) A minute cranidium. U. S. National Museum, Cata- 

 logue No. 17454^- 

 The specimens represented by figs. 4, 4b are from the Lower Cam- 

 brian limestone of localities 38a and 43a, Washington County, New 

 York. 



Corynexochus stcphoicnsis (Walcott) 324 



Figs. 5, 5a. (X2.) Nearly entire dorsal shield with the free cheeks 

 restored from other specimens and matrix of same. U. S. 

 National Museum, Catalogue No. 61731. 

 From locality 14s, Middle Cambrian: Stephen formation; Mount 

 Stephen, British Columbia, Canada. 



This is the same figure as that of pi. 3, fig. 4 (Canadian Alpine 

 Jour., Vol. I, 1908) and fig. 8, pi. 36 (Smithsonian Misc. Coll., Vol. 

 64, 1915). It is reproduced here in order that direct comparison may 

 be made with other species of Corynexochus. 



