6 PALEONTOLOGY OF NEW YORK. 



in further illustration of the species, retains the pygidium and indications 

 of ten segments. The former fragment has a length of 155 mm., and a 

 width of bin mm.; the latter a length of 220 mm., and a width of 150 

 mill. These specimens were obtained by Mr. Louis Bevier, of Marbletown, 

 Ulster county. They are beyond doubt representatives of the largest known 

 of this genus, and were two of the largest known trilobites. Mr. Whit- 

 field estimates the entire length of the specimen described by him, as restored 

 from proportions furnished by other species, at fifteen and one-half inches. 

 With the figure of the larger specimen here given is an outline restoration, the 

 data for which have been derived from a careful summary of measurements of 

 species in which the pygidium is strongly annulated. The result indicates an 

 individual measuring 374 mm. or 14.95 inches in length, and 145 mm. or 5.8 

 inches across the base of the cephalon. This outline will help the student to 

 realize, better than maybe done from the figure of the fragment alone, the 

 colossal size attained by this species. 



Fragments of Homalonoti of large size have been described by other authors. 

 Salter has referred (Paheontogr. Soc, vol. xvii, p. 109) to a large specimen of 

 Homalonotus rudis, winch he estimates may have been a foot in length when 

 entire. Beushausen has figured a pygidium of Homalonotus gigas, F. A. Rcemer, 

 from the Spiriferen-sandstein of the Hartz Mountains (Beitr. zur Kenntn. Ober- 

 harz. Spirit'. Sndst'ns, pi. i, tig. 1. 1884), which measures 94 mm. in length, 

 and though proportionally narrower than the pygidium in H. major, represents 

 an individual probably not much shorter than the one here illustrated. It is 

 noteworthy that this large species, Homalonotus gigas, is from a lower Devonian 

 formation, not widely differing in age from the horizon of Homalonotus major. 

 In the distinctly annulated pygidium, Homalonotus major agrees with the major- 

 ity, if nut with all the species of Homalonotus known from Silurian and lower 

 Devonian horizons, and in this regard differs from Homalonotus Dekaiji of the 

 Hamilton group, in which the annulal ions are faint or obsolete. 



Distribution. The locality of these fossils as given by Mr. Bevier, for the 

 specimen here figured, is "Lower Oriskany, bank of 4th Binnewater, Rosendale, 

 Ulster county;' and lor the type specimen, "Upper Oriskany, Cranberry Dam, 5th 



