SOME NEW DEVONIC FOSSILS 165 



The aspect of the cephalon before us is very unlike that of 

 D. (P.) biardi in the various details referred to. Dalman- 

 ites (P.) nasutus Conrad 1 is a bifurcate species in the Helder- 

 bergian (New Scotland beds) of New York, which has more in 

 common with P. esnoufi, specially in its smooth border, but 

 the base of its snout is very much more elongated and its branches 

 slender and cylindrical. The specimen measures in length, from 

 tip of snout 32 mm, from front of glabella 23 mm and in width 

 50 mm. 



Lower Devonic. Grande Greve, P. Q. 



Phacops logani Hall var. gaspensis nov. 



The species of Phacops very common in the Grande Greve lime- 

 stones presents itself in all variations of size. The larger forms 

 are coarsely tubercled on the glabella and in these there is a well 

 defined row of knobs on the thoracic axis along the dorsal furrows, 

 shown always to best advantage on the internal cast. The pygidium 



Phacops logani var. gaspensis 



has four to five duplicate lateral ribs. Added to these critical 

 features is the absence of genal spinules. The larger of these 

 forms have a close and distinct resemblance to the species described 

 by Hall as P. bombifrons 2 from " the limestone of the Helder- 

 berg mountains/' by which was intended that now known as the 

 Onondaga limestone, a resemblance expressed in all the characters 

 of the cephalon which carries a full bombate glabella. We have 



Palaeontology of New York, 3: 362, pi. 76, fig. 1-8. 



descriptions of New Species of Fossils. 1861. p. 67; N. Y. State Cab. Nat. Hist. 15th 

 An. Rep't. 1862. p. 95; Illustrations of Devonian Fossils. 1876. pi. 6, fig. 22-24, 29. 



