360 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 57 



DikelocepJialiis minncsotensis Owen as now restricted does not 

 occur in the supposed Jordan formation fauna exposed about Devils 

 Lake, Wisconsin. The genus is there represented by a variety of D. 

 f limbatiis. The typical form of this species occurs in the upper St. 

 Lawrence beds at Osceola (78, 78b). There are fragments of a large 

 trilobite that sugg-est D. minnesotensis at Osceola, but the identifica- 

 tion is too uncertain to be of value. As far as known to me, D. min- 

 ncsotensis does not occur in the Madison sandstone of the post- 

 Cambrian. The species is found at the following, among other 

 localities, in association with other genera and species as given in the 

 following lists : 



(Locality 85) Upper Cambrian : St. Lawrence formation at Prairie 

 du Sac, Sauk County, Wisconsin (Cooper Curtice, 1884). 



Oholus (Wcstonta) aurora (Hall) 



Obolus (Wcstonia) stoneanus (Whit- 

 field) 



Lingulella viosia (Hall) 



Lingulella oweni (Walcott) 



Lingulella winona (Hall) 



Lingulella winona convexa (Wal- 

 cott) 



Oivcnclla antiqiiata (Whitfield) 

 Dikcloccphaliis minnesotensis Owen 

 Saukia crassimarginata (Whitfield) 

 Saukia lodensis (Whitfield) 

 Saukia pcpinensis (Owen) 

 Illcemirus quadratus Hall 

 Aglaspis barrandei Hall 

 Aglaspis eatoni Whitfield 



(Locality 86) Upper Cambrian: St. Lawrence formation at Van 

 Ness quarry, Gibraltar Bluff, Lodi, Columbia County, Wisconsin 

 (L. C. Wooster, 1883; Cooper Curtice, 1884). 



Obolus (JVestonia) aurora (Hall) 

 Lingulella mosia (Hall) 

 Lingulella oweni (Walcott) 

 Dikelocephalus viinnesotensis Owen 



Saukia lodensis (Whitfield) 

 Illcenurus quadratus Hall 

 Aglast^is barrandei Hall 



(Locality 113) Upper Cambrian: St. Lawrence formation at La 

 Grange Mountain (or Barn Bluff), near Red Wing, Goodhue County, 

 Minnesota (Cooper Curtice, 1884). 



Lingulella mosia (Hall) 

 Lingulella winona (Hall) 

 Serpulites murchisoni Hall 

 Owenella vaticina (Hall) 



Triartlirella auroralis Hall 

 Ptychaspis sp. ? 



Dikelocephalus minnesotensis Owen 

 Saukia pepinensis (Owen) 



Saukia. — The genotype of the genus, Saukia lodensis, occurs only 

 in the Upper Cambrian St. Lawrence formation. It is associated at 

 localities 85 and 86 with the species listed above. 



Saukia crassimarginata has a somewhat greater vertical range 

 as it occurs with S. lodensis, and also in the overlying Jordan 

 sandstone. At locality 78b it is associated with the following species : 



