NO. 9 NEW CAMBRIAN TRILOBITE FAUNULE — RASETTI 15 



Types.— Rolotype: U.S.N.M. 145991. Paratypes: U.S.N.M 

 145992. 



ANALOX Rasetti, new genus 



Description. — Cephalon of moderate overall convexity, well rounded, 

 somewhat narrowing toward the front. Glabella terminating in the 

 merged axial and border furrows, divided into posterior and anterior 

 lobes by a wide, moderately deep transglabellar furrow; no other 

 furrows present. Posterior glabellar lobe strongly elevated and 

 extended backward into a broad spine. Occipital ring short, barely 

 differentiated under the rearward extension of the glabella. Anterior 

 border swollen medially, defined by a pair of furrows directed out- 

 ward and forward from the anterior angles of the glabella, not reach- 

 ing the cephalic margin but ending abruptly in a pair of pits. Lateral 

 border absent ; cephalic margin in this portion downrolled into the 

 doublure. Posterior border furrow and border well developed ; genic- 

 ulation distally located ; genal spine absent. Border furrow extended 

 for a short distance forward from the genal angle and then fading 

 out. 



Pygidium about equally wide and long, rather strongly convex; 

 posterior outline regularly rounded. Axis relatively narrow, defined 

 by a narrow but deep axial furrow, not greatly raised above the 

 general convexity, in type species showing seven rings plus a terminal 

 section, lacking nodes or spines. Border present but exceedingly 

 narrow, defined by an equally narrow border furrow. Doublure form- 

 ing a vertical face, not extended into spines. 



Type species. — Analox bipunctata Rasetti, new species. 



Occurrence. — Late Lower Cambrian of New York. 



Discussion. — The glabella with its transglabellar furrow is like 

 certain forms herein attributed to Calodiscus. The unique feature 

 of the genus is the lack of a lateral cephalic border. The pygidium 

 in dorsal view resembles the pygidia of Pagetides, but has the unusual 

 vertical doublure. 



ANALOX BIPUNCTATA Rasetti, new species 

 Plate 2, figure 2 ; plate 6, figures 1-10 



Available material. — Numerous, well-preserved cephala and py- 

 gidia. This is one of the more common species of the Acimetopus 

 hilobatus faunule. 



Description.— Most of the features were indicated in the generic 

 diagnosis. Glabella defined by a broad, fairly deep axial furrow; 



