504 CAMBRIAN BRACHIOPODA. 



grandis" [figs. 7a and 7b] are so diagrammatic that it is impossible to make comparisons between 

 them and the drawings of the same specimens which accompany this monograph. 



Formation and locality. — Lower Ordovician : (301s) Gray sandstones of Division 3e(?) of Matthew [1894, p. 91] at 

 McAphee's corner, Hardingville, St. John County, New Brunswick. 



LiNGULELLA GRANVILLENSIS Walcott. 



Plate XXII, figures 1, la-d. 



lAngulella granvillensis Walcott, 1887, Am. Jour. Sci., 3d ser., vol. 34, pp. 188-189, PL I, figs. 15, 15a-c. (Described 

 and discussed as a new species. The specimens represented by figs. 15, 15a, and 15b are redrawn in this mono- 

 graph, PL XXII, figs. Ic, Id, and 1, respectively.) 



Lingulella granviUensisW&lcott, Obhlert, 1889, Annuaire geologique universel for 1888, tome 5, p. 1138. (Described in 

 French in a review of the preceding reference.) 



Lingulella granvillensis Walcott, 1891, Tenth Ann. Rept. U. S. Geol. Survey, pp. 607-608, PL LXVII, figs. 4, 4a-d. 

 (Description and figs. 4, 4a-c, copied from Walcott, 1887, p. 188, PL I, figs. 15, 15a-c.) 



lAngulella granvillensis Walcott, Hall and Clarke, 1892, Nat. Hist. New York, Paleontology, vol. 8, pt. 1, p. 58. 

 (Discussed.) 



General form rather broadly ovate, with the ventral valve obtusely acuminate and the 

 dorsal valve obtusely oval. Valves moderately convex, the dorsal being somewhat more so 

 than the ventral. Surface of shell marked by concentric lines of growth, with very fine, slightly 

 undulating striae between them, and a few very indistinct radiating stride. The character of 

 the surface of the inner layers and of the interior of the shell is unknown. The shell appears 

 to have been rather thin and formed of a thin outer layer and one or more inner layers or 



A rather large ventral valve has a length of 6 mm. and a width of 4. 5, mm., and an asso- 

 ciated dorsal valve 5 mm. in length has a width of 3.5 mm. The interior of a small ventral 

 valve shows the visceral area and the two main vascular sinuses; on a cast of the dorsal valve 

 the main vascular sinuses are shown, also a fine irregular network of interior branches of the 

 main sinuses and a few peripheral branches of the vascular system. These are shown by 

 Plate XXII, figure Id. A broad, low ridge, represented on the cast by a shallow depression, 

 extends forward in front of the area two-thirds the distance toward the frontal margin. It 

 is marked on the median fine near the center of the shell by a sharp, narrow median septum, 

 and fines indicating the path of advance of the central and anterior lateral muscle scars. The 

 scars are not clearly defined, but appear to be situated as indicated on figure Id. In front 

 of the anterior lateral muscle scars there is a peculiar rhomboidal area that is not so well defined 

 in any other species. 



Olservations. — This is one of the small species that in size and general form resembles 

 Lingulella ferruginea Salter of the Middle Cambrian of the Atlantic basin; also L. manticula 

 (Wlfite) of the Upper Cambrian and Lower Ordovician of the Rocky Mountain region; it 

 differs from the former in its broader anterior outline and from the latter in its more acuminate 

 form and shorter area. 



Tins form owes its specific name to the occurrence of the type specimen near Granville, 

 New York. 



Formation and LOCALrry, — Lower Cambrian: (20a) Gray limestone, interbedded with shaly slates, in a lane 

 west of Lafayette Stevens's house, about 100 yards (91.4 m.) from the main road, in the southern part of 'WTiitehall 

 Township, Fort Ann quadrangle (U. S. Geol. Survey); (21a) limestone below the first fall of Mettawee River, 

 above the North Granville bridge. Fort Ann quadrangle (U. S. Geol. Survey); (37b) limestones 0.25 mile (0.4 

 km.) east of Salem, Cambridge quadrangle (U. S. Geol. Survey); (38a) limestone 2 miles (3.2 km.) south of North 

 Granville, on the first road vihich turns south from the road running between that village and Truthville, 4 miles {6.4 im.) 

 west-northwest of Granville, Fort Ann quadrangle (U. S. Geol. Survey); (34) limestone on roadside a little west 

 of the bridge over Poultney River, at Low Hampton, about 5 miles (8 km.) east-northeast of Whitehall, ■\\Tiitehall 

 quadrangle (U. S. Geol. Survey); (338m) limestone on the roadside north of schoolhouse No. 4, in the northeast 

 part of Whitehall, Whitehall quadrangle (U. S. Geol. Survey); (35) limestone 1.5 miles (2.4 km.) north of Bald 

 Mountain, and 3.5 miles (5.6 km.) north-northwest of Greenwich, Schuylerville quadrangle (U. S. Geol. Survey); 

 (38) limestone 0.25 mile (0.4 km.) north of John Hulett's farmhouse about 3 miles (4.8 km.) west of South Granville, 

 and 4.5 miles (7.2 km.) southwest of Granville, Fort Ann quadrangle (U. S. Geol. Survey); and (3381) limestone in 



