348 CAMBRIAN BRACHIOPODA. 



In the Hanford Brook section of New Brunswick I found very good illustrations of this 

 species in Matthew's "Etcheminian." 



This form owes its specific name to its occurrence at the Straits of Belleisle, Labrador. 



Formation and locality. — Lower Cambrian: (41a) Limestone [Walcott, 1891b, p. 260] on the mainland beneath 

 Topsail Head, Conception Bay; (314e [Walcott, 1886a, p. 150]) limestone at Topsail Head, Conception Bay; (5r) lime- 

 stone near the railroad track 1.5 miles (2.4 km.) west of the railway station at Manuels, Conception Bay; (5t) shale 

 and limestone nodules about 20 feet (6 m.) above the base of the Cambrian, on Redrock Point, near Chappie Cove, 

 Hollj^wood Point, Conception Bay; (51) limestone on Smith Point, in Smith Sound, Trinity Bay; and (314f) lime- 

 stone of B7 of the section at Bonne Bay [\A^alcott, 1891b, p. 255]; all in Newfoundland. 



(392a) Limestones [Walcott, 1891b, p. 354] at L'Anse au Loup on the north shore of the Straits of Belleisle, Labrador. 



(3a) 450 feet (137.1 m.) below the quartzite in the St. John formation and over 500 feet (152.4 m.) below the 

 Protolenus zone of Matthew [Walcott, 1900, pp. 320-322], Hanford Brook; and (301v [Walcott, 1900, p. 322]) sandy 

 shales of Division 2b of the "basal series' ' of Matthew, on Hanford Brook; both in St. John County, New Brunswick. 



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



(8b) Limestone just north of Beman Park, in the northeastern part of the city of Troy, Troy quadrangle (U. S. Geol. 

 Survey), Rensselaer County, New York. 



(304o) Sandstone at Nuneaton, England. 



(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 riiine, Silver Peak quadrangle 

 (U. S. Geol. Survey), Esmeralda County, Nevada. 



(57r and 58s) About 150 feet (46 m.) below the Middle Cambrian near the base of the limestones forming 3 of 

 the Mount "WTiyte formation [Walcott, 1908c, p. 241 (10)], just above the tunnel on the north shoulder of Mount 

 Stephen, about 3 miles (4.8 km.) east of Field, British Columbia. 



Specimens somewhat doubtfidly referred to this species occur at the following locality : 



Lower Cambrian: (2r) Limestone bowlders in a conglomerate in a cut on the Intercolonial Railway, 2 miles 

 (3.2 km.) west of Bic railway station, Rimouski County, Quebec. 



MicROMiTRA (Paterina) labradorica orien TALIS (Walcott). 



Plate II, figure 11. 



Iphidella labradorica orientalis Walcott, 1905, Proc. U. S. Nat. Mus., vol. 28, pp. 305-306. (Characterized as below 

 as a new variety.) 



Only one dorsal valve of this shell occurs in the collection. Its general form and surface 

 characters are very much like those of Micromitra {Paterina) labradorica swantonensis (Walcott) 

 [PL II, figs. 3, 3a-f]. The varietal name is given more on account of the fact that this shell 

 occurs in China and the variety swantonensis on the eastern side of the North American con- 

 tinent than from any marked differences between the shells from the two localities. It may 

 be that with a good series of shells from China differences would be found that are not to be 

 determined with only the single shell for comparison. 



Fokmation and locality. — Middle Cambrian: (C9) Lower limestone member of the Kiulung gi'oup [Blackwelder, 

 1907a, pp. 37 and 39 (3d list of fossils)], 3 miles (4.8 km.) southwest of Yenchuang, Sintai district. Shantung, China. 



Micromitra (Paterina) labradorica swantonensis (Walcott). 



Plate II, figm-es 3, 3a-f. 



Kutorgina labradorica Walcott (in part) [not (Billings)], 1886, Bull. U. S. Geol. Survey No. 30, PI. IX, figs. 2, 2a-b. 

 (The text reference [on page 104] includes only specimens belonging to the species Micromitra (Paterina) labra- 

 dorica. The figures represent specimens of the variety swantonensis, which are redrawn in this monograph, 

 PL II, figs. 3, 3a-b, respectively.) 



Kutorgina labradorica swantonensis Walcott, 1890, Proc. U. S. Nat. Mus. for 1889, vol. 12, p. 36. (Characterized as 

 a new variety.) 



Paterina labradorica Beechek [not (Billings)], 1891, Am. Jour. Sci., 3d ser., vol. 41, footnote, pp. 345-346, PI. XVII, 

 figs. 1 and 2. (Discussed as the type of the new genus Paterina. Figs.' 1 and 2 are copied from Walcott's 

 figures, 1886b, PI. IX, figs. 2b and 2, respectively.) 



Kutorgina labradorica sivantonensis Walcott, 1891, Tenth Ann. Rept. U. S. Geol. Survey, p. 609, PL LXIX, figs. 

 2, 2a-b. (Characterized. Figs. 2, 2a-b are copied from Walcott, 1886b, PI. IX, figs. 2, 2a-b.) 



Paterina labradorica Hall and Clarke [not (Billings)], 1892, Eleventh Ann. Rept. State Geologist New York for 1891, 

 p. 247, fig. 258. (Genus Paterina described. Fig. 258 is copied from Walcott, 1886b, PL IX, figs. 2b and 2a.; 



Iphidea bella Hall and Clarke [not Billings], 1892, idem, p. 249, PL IV, figs. 4 and 5. (Mentioned.) 



