220 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 64 



vania/ It is also of the same type as the surface of Olcnellus reticu- 

 latus Peach ^ from Scotland. 



Formation and locality. — Lower Cambrian: (i2x) Argillaceous 

 shaly beds i mile (1.6 km.) north of Rohrerstown, Lancaster County, 

 Pennsylvania. 



Family Oryctocephalid.5i Beecher 

 VANUXEMELLA, new genus 



Dorsal shield small, subelliptical, moderately convex, and with 

 strongly marked axial lobe. Cephalon semicircular in outline ; 

 glabella large, slightly expanding in front and slightly narrowed 

 opposite the palpebral lobes ; it terminates anteriorly on the frontal 

 margin, and posteriorly is separated from the narrow occipital 

 segment by a strong transverse furrow ; two pairs of faint pits 

 indicate the position of glabella furrows; fixed cheeks about one- 

 half the width of glabella and with a narrow palpebral lobe about 

 one-fourth to one-third the length of the cephalon and placed at 

 about the transverse center of the cephalon. The facial sutures cut 

 the posterior margin of the cephalon on a line with the outer margin 

 of the palpebral lobes and bend inward slightly to the base of the 

 palpebral lobes, about which they curve, and then curve slightly 

 inward toward the margin near the glabella. Free cheeks of medium 

 width with posterior margin bent forward at the intergenal angle to 

 meet the base of the genal spine. The palpebral ridges cross the 

 fixed cheeks to the dorsal furrows beside the glabella. 



Thorax with four or five segments ; pleurae with strong longi- 

 tudinal furrow and short, falcate ends. 



Pygidium with strong axial lobe terminating just within the margin 

 and crossed by five or six furrows which continue laterally on the 

 pleural lobes and outline three or four segments that have a short, 

 falcate end beyond the line of the border of the pygidium ; on each 

 side of the center of the posterior margin, at about the ends of the 

 central third, a small, strong spine extends directly backward, and 

 two very short spines occur between them, one on each side of the 

 center of the posterior margin of the pygidium. 



Surface slightly roughened and apparently minutely punctate. 



Genotype. — Vanuxemella contracta Walcott. Second species, 

 Vanuxemella nortia, new species. 



Stratigraphic range. — Upper beds of Lower Cambrian. 



Smithsonian Misc. Coll., Vol. 53, No. 6, 1910, pi. 31, figs. 12 and 13. 

 Idem, pi. 39, figs. 10, II. 



