582 CAMBEIAN BRACHIOPODA. 



fig. Id) shows two vascular canals radiating forward from near the apex. Radiating lines 

 occur on the interior of the same character as those of the ventral valve. 



Observations. — Since writing on this species in 1886 I have collected specimens showing 

 the character of the areas of the valves and also obtained further information relative to the 

 interior of the dorsal valve. The rudimentary areas are less advanced in development than 

 those of Micromitra, and the muscle scars of the dorsal valve are much like those of Oholella 

 and Oholus. 



The presence of rudimentary teeth in Eutorgina cingulata is very difficult to demonstrate 

 by actual observation, owing to the character oiF the matrix in which the specimens occur. 

 That articulating processes are present, however, is indicated by the fact that in a relatively 

 small collection tliirty of the valves are united, and the fact that the dorsal valve is rarely 

 in any other position than that in which it would be if teeth in the ventral valve held it in its 

 normal position. In only a few of the specimens have the valves sUd or turned either way, 

 as they frequently do in the inarticulates. 



The specimens from Bio Harbor and east of Swanton, Vermont, are better than those 

 from the type locahty at L'Anse au Loup, so I have selected material from these localities for 

 illustration, with the exception of a dorsal and ventral valve. Many of the Vermont shells 

 are larger and more fully developed, biit specimens of the same size as those from L'Anse au 

 Loup and Bic Harbor are identical in the characters available for comparison. 



Formation and locality. — Lower Cambrian: (392a) Limestones at L'Anse auLoup, on the north shore of the Straits 

 of Belleisle; and (392 1)'^ arenaceous limestone at Point Amour, Straits of Belleisle; both in Labrador. 



(2o) Limestone bowlders in conglomerate, on shore at east entrance to harbor at Bic, Rimouski County, Quebec, 

 Canada. 



(25a)6 Limestone on the Hall (Donaldson's) farm, 2 miles (3.2 km.) east of Swanton; and (319m) shales of No. 6 

 of the section at Parker's quarry [Walcott, 1891b, p. 278], near Georgia; both in Franklin County, Vermont. 



(Iv) Shales of No. 3 of the Silver Peak Group, Barrel Spring section [Walcott, 1908f, p. 189],. 3 miles (4.8 km.) 

 north of Valcalda Spring and 4 miles (6.4 km.) west-northwest of the Drinkwater mine. Silver Peak quadrangle (U. S. 

 Geol. Survey), Esmeralda County, Nevada. 



(35f) About 300 feet (91 m.) below the Middle Cambrian in the limestone forming 6 of the Mount Whyte forma- 

 tion [Walcott, 1908c, p. 242 (11)] just above the tunnel on the north shoulder of Mount Stephen, about 3 miles (4.8 

 km.) east of Field, British Columbia, Canada. 



(347 [von Toll, 1899, p. 27]) Near Tschurskaja Station, on Lena River, Siberia. 



KUTOEGINA GEANXJLATA MatthcW. 

 Plate V, figures 5, 5a-c. 



Kutorgina granulata Matthew, 1899, Bull. Nat. Hist. Soc. New Brunswick, vol. 4, pt. 3, No. 18, p. 189, PI. I, figs. 



2a-d. (Characterized and discussed as a new species. The specimens represented by figs. 2a, 2b, and 2c are 



redrawn in this monograph, PI. V, figs. 5 and 5a, 5c, and 5b, respectively.) 

 Kutorgina granulata Matthew, 1899, Trans. Roy. Soc. Canada for 1899, 2d ser., vol. 5, sec. 4, No. 4, p. 98, PI. V, figs. 



2a-d. (Described and discussed. Figs. 2a-d are copied from figs. 2a-d of the preceding reference.) 



The description by Matthew [1899e, p. 98] follows: 



Shell substance calcareous. Hinge-line straight, somewhat shorter than the full width of the shell; lateral margin 

 straight near the hinge; front margin broadly rounded. 



Ventral valve convex, the umbo considerably elevated, the posterior thhd of the shell somewhat more tumid 

 than the rest; lateral angles somewhat flattened. The area appears to have a deltidium, about one-fifth as wide as the 

 length of the hinge-line; this line, when viewed from behind, appears to be bent up in the middle. Interior: On 

 the posterior half there are a number of low vascular ridges; two of these inclose a median groove, which extends 

 to within a thii'd of the front of the valve; there are about three other ridges on each side. These ridges are most 

 distinct near the umbo, and about three or four are found in the space of 1 millimeter. 



The dorsal valve is flatter, and has the umbo depressed to the cardinal line, and the sides of the valve toward 

 the hinge much flattened. Interior: There is a median septum extending about one-third of the length of the valve, 

 and faintly indicated for another third to a point where there is a small pit on the inner surface of the valve; and 

 there are also radiating lines as in the ventral valve, but more numerous. 



. The surface is minutely granulated. On the somewhat tumid posterior third of the valve concentric strite are 

 faintly visible, but they become distinct on the anterior part, and there are very fine radial lines, giving to the summit 



o These specimens are in tbe collections of the Geological Survey of Canada. 6 The species also occurs in Locality 3196. 



