Report of the State Geologist* 



Lower Helderberg group of New Fork, and C. Macrobius, I > i 1 - 

 - (sp.), from a similar fauna] association at Square Lake, 

 Maine. There is a Large andescribed species known to the writer 

 in the Oriskany sandstone of New York; ('. wrenicoVu*) Hall 

 (sp.), occurs in the Schoharie gril and Corniferous limestone, ( 

 varicella. Hall (sp.), in the Corniferous limestone, and ( '. g< un/tceus, 

 Hall (sp.), in the Corniferous and Hamilton groups. Asapkus 

 (Proetus) Stokesi, Murchison, is ]>rol >ably a member of the same 

 group, and it may be suggested that the pygidium figured by 

 Novak as Arethusiha peltata, sp. nov., from the Hercynian, 

 possesses a striking similarity to that of Cordania. 



An interesting species was described by the late Mr. Meek in 

 1877, from the Devonian -of Steptoe Valley, Nevada, under the 

 name, Proetus (Phaeton) denticulatns. The pygidium of this 

 form is short, with a very short, relatively broad rhachis and* a 

 row of deep denticulations about the margin. The surface is not 

 otherwise spinous. A glabella found in association with it is 

 distinctly proetoid. Mr. Meek's figures of this fossil were repro- 

 duced in the Palaeontology of New York, volume vii (pi. xxv, 

 figs. 14, 15), and in the discussion of the species (there referred 

 to Phaethonides (?) ), attention was directed to its similarity in 

 form to Phaeton jplanicauda, Barrande, the species since taken 

 by Novak as the type of his Phaetonellus. As the latter genus 

 is now defined, P. denticulatns is an excellent representative of it. 



