130 NEW YORK STATE MUSEUM 



rather finely pustulose especially on the cheek spines. The thoracic segments 

 show no features that can be regarded as distinctive. 



Pygidiiun. Elongate, subequally triangular, subacuminate, of the gen- 

 eral type of D. m i c r u r u s and less like the nodose surface with long tail 

 spine characterizing D. (Probolium) nasutus. Axis relatively nar- 

 row, segments 10-12. Pleural ribs 9-10, flat above, grooved by a fine line 

 and separated from each other by rather narrow furrows. Caudal termina- 

 tion a broad and short, acute and slightly upturned spine. Surface finely 

 gfanulose on the ribs and along the margins with obscure evidence of low 

 faint nodes. 



Dimensions. The average of our specimens indicates a length of 

 cephalon not including the snout, of 30 mm, a width of 63 mm. In such a 

 specimen the snout would have a length of 16 mm with a spread from tip 

 to tip of the lateral spines of 12 mm. An average pygidium measures 

 36 mm in length and 42 mm in width. , 



We refer above to Salter's assignment of this species to his P h a c o p s 

 weaver! which is a Siluric form from the May Hill sandstone. He has 

 given a wood cut of a cephalon evidently incomplete at the proboscis of 

 which he says in footnote. " I have good reason to believe this Canadian 

 species brought by Sir W. Logan from He Perce, Gaspe, Lower Canada, to 

 be identical with ours. The tail is a little more mucronate. The head 

 agrees nearly with our fragments, and will at all events give collectors a 

 good idea of the probable shape. It is remarkably triangular even for this 

 subgenus " [Odontochile]. 



Though parts of this species are quite abundantly diffused through the 

 rocks, entire examples have proven uncommon. One individual too incom- 

 plete for illustration affords a total length of 3^ inches with a greatest 

 diameter of i^ inches. The parts will not be confused with the larger 

 species here present, D. perceensis, on account of absence of nodes on 

 the pygidium and the much less degree of annulation which is a persistent 

 feature in all the specimens examined. 



Locality. Perce Rock and Blowhole Cliffs. 



Species name. Charles Biard of Perce, to whose appreciative helpful- 

 ness in my work I owe much, 



Dalmanites (Probolium) esnoufi, nov. 



Plate 9, figure 5 



A quite imperfect cephalon is the only representative thus far found In 

 the Grande Greve rocks of the Probolium type of structure. In its general 

 features it has the aspect of the shields which are here referred to 

 D. m i c r u r u s , the border being broad, flat and smooth at the edge, the 

 frontal lobe of the glabella transverse and rather narrow, the other lobes 



