1 62 NEW YORK STATE MUSEUM 



tions with regularly widened tubercles on the axis, in the other it 

 is large and has coarse irregularly scattered tubercles. The pyg- 

 idium before us is of the general type of D. bisignatus but is 

 larger and considerably more segmented. Thus D. bisignatus 

 has 7-8 pleural ribs while D. ploratus has 15-16, the former 

 10-12 axial rings, the latter 20-22. Notwithstanding this difference 

 there is a similarity in the size and arrangement of the tubercles or 



Dalmanites ploratus 



granules ; on the annulations there is a single row r of four of 

 which the middle ones are largest. Passing to the apex of the 

 spindle this middle pair becomes more conspicuous by the disap- 

 pearance of the others and thus there appears to be a double axial 

 row of these pustules. On the pleurae they are scattered irreg- 

 ularly and faintly over the sulcate ribs. Our specimens do not 

 show whether or not the caudal extremity ends in a spine. 



Lower Devonic. Loose at Cunningham's camp, 4 miles below 

 Matagamon lake, Me. 



Dalmanites (Probolium) biardi no v. 



Phacops weaveri? Salter. Silurian Trilobites. 1864. p. 57, fig. 15 



Cephalon broadly subelliptical in outline, short axially, like the 

 prevailing type in contemporaneous faunas (D. a n c h i o p s, 

 pleuroptyx, stemmatus, nasutus, tridens). Gla- 

 bellar division normal but the usual fusion of lobes 1 and 2 at their 

 distal extremities which affects so many of the early Devonic 

 species of Dalmanites, is not strongly expressed and herein again 

 there is agreement with D. (Probolium) nasutus and tri- 

 dens. Margin entire except near the anterior extremity where 

 there is a series of broad low scallops or crenulations, three or 

 four in number on each side of the snout. These are so obscure 



