784 CAMBRIAN BRACHIOPODA. 



The specific name is given in honor of Dr. J. S. Newberry. 



Formation and locality. — TTpper Cambrian: (54c) About 1,100 feet {335.3 m.) above the Middle Cambrian and 

 120 feet (36.6 m.) below the top of the Upper Cambrian in the central part of the limestones forming 1 of the St. Charles 

 formation [ Walcott, 190Sf, p. 192] ; and (54d) about 1,050 feet (320 m.) above the Middle Cambrian and 175 feet (53.3 m.) 

 below the top of the Upper Cambrian, in the lower part of the limestones forming 1 of the St. Charles formation [Wal- 

 cott, 1908f, p. 192]j both in Blacksmith Fork Canyon, about 10 miles (16.1 km.) east of Hyrum, Cache County, Utah. 



EooETHis NEWTONENSis (Weller). 

 Plate XCVII, figures 9, 9a. 



Orthis newtonensis Weller, 1903, Geol. Survey New Jersey, Kept. Paleontology, vol. 3, pp. 113-114, PI. I, figs. 3-5. 

 (Described and discussed as a new species.) 



Orthis (Plectorthis) newtonensis (Weller), Walcott, 1905, Proc. U. S. Nat. Mus., vol. 28, p. 267. (Described and dis- 

 cussed as below.) 



Tliis Httle shell occurs in the form of casts in a sandstone that is too coarse to preserve 

 the details of the outer surface. The cast of the interior shows fine, simple, radiating ribs 

 that increase by interpolation and that are coarser on the ventral than on the dorsal valve. 

 Ventral valve shghtly fiattened at the front; dorsal valve with a broad mesial sinus. The 

 shell appears to have been thin. The cast of the pseudospondyhum of the ventral valve 

 shows it to have been clearly defined; the area is low and not sharply defined from the curve 

 of the cardinal margin; it is nearly vertical to the plane of the margin of the valve. The cast 

 of the area beneath the umbo in the dorsal valve is more triangular and less transverse than 

 usual; unfortunately the material is too imperfect to determine any details. 



Ohservations. — This species is the eastern representative in the Upper Cambrian of EoortJiis 

 indianola (Walcott) and E. iddingsi (Walcott). As far as can be determined by the material 

 available for comparison it is closely related to those species but it is not probable that they 

 are specifically identical. 



The specific name is derived from Newton, New Jersey. 



Formation and locality. — Upper Cambrian: (lie) Hardyston quartzite [Weller, 1900, pp. 10 and 12], O'Don- 

 nell and McManniman's quarry, Newton, Sussex County, New Jersey. 



EOORTHIS PAGODA (Walcott). 



Plate XCVII, figures 12, 12a-d. 



Orthis (Plectorthis) pagoda Walcott, 1905, Proc. U. S. Nat. Mus., vol. 28, pp. 267-268. (Described and discussed as 

 - below as a new species.) 



Shell transverse, subsemicircular; a ventral valve 11 mm. in length has a width of 15 mm., 

 and a dorsal valve 8 mm. in length has a width of 13 mm.; hinge line a little shorter than the 

 greatest width of the shell; cardinal angles vary from 75° to 111°; valves moderately convex. 

 Cardinal area narrow in both valves and inclined backward from the hinge line. Surface marked 

 by .equidistant, narrow, low ribs, 3 in a space of 2 mm. near the front margm of a shell 10 mm. 

 long, with fiiie, radiating striae between them; the radiating ribs and striae are crossed by 

 fine, concentric striae, and lines of growth. 



Ventral valve with a strong, somewhat angular, median fold rising from a well-defined 

 depression on each side of it, or it might be designated as a very strong rib rising above the 

 general surface of the valve from a broad, median depression; the lateral slopes are gently 

 convex. Dorsal valve Avith a strong, angular, median depression, beginning at the posterior 

 margin and gradually widening to the front; the sides of the depression rise above the general 

 surface of the valve, and form with the outer slope a well-defuied low ridge on each side that 

 extends a httle forward on the front margin to fit into the depressions on each side of the 

 median fold of the ventral valve. 



The interior of a small dorsal valve has a broad, strong ridge corresponding to the depres- 

 sion on the exterior surface ; ai main vascular sinus starts on each side of the base of the median 

 ridge and arches outward and then forward about a depressed oval space on each side of the 



