324 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



A comparison with American specimens of the Mesonacidre leads 

 me to think that this form may be most nearly related to Mesonacis 

 veruiontana. With the limited material now available for comparison 

 I will leave it, doubtfully, under Olenellus. 



Formation and Locality. — Lower Cambrian: argillaceous shale 

 interbedded in " Serpulite grit," a coarse quartzitic sandstone, north- 

 ern slope of Meal a' Ghubhais 1,200-1,300 feet (366-396 m.) above 

 Loch Maree, 4 miles (6.4 km.) northwest of Kenlochewe in the 

 west of Ross-shire, Scotland. 



OLENELLUS GILBERTI Meek 



Plate ^6, Figs. 1-17; Plate 43, Figs. 5 and 6 



Olenellus gilberti Meek, 1874. (Manuscript.) 



Olenellus hozt'elli Meek., 1874. (Manuscript.) 



Olenellus gilberti (Meek), White, 1874, Geogr. and Geol, Expl. and Surv. 

 West looth Meridian, Prelim. Rept., p. 7. (Copies Meek's manuscript 

 description.) 



Olcnclhis hoiuelli (Meek), White, 1874, Idem, Prelim. Rept., p. 8. (Copies 

 Meek's manuscript description.) 



Olenus {Olenellus) gilberti (Meek), Gilbert, 1875, Idem, Vol. 3, pp. 182- 

 183. (Copied from White, 1874, p. 7.) 



Olenus {Olenellus) howelli (Meek), Gilbert, 1875, Idem, Vol. 3, p. 183. 

 (Copied from White, 1874, p. 8.) 



Olenellus gilberti (Meek), White, 1877, Idem, Vol. 4, pt. i, pp. 44-46, pi. 

 2, figs. 3a-e. (Described and discussed. The specimens represented by 

 figures 3a, 3b, and 3c are redrawn in this paper, pi. 36, figs. 3, i, and 2 

 respectively.) 



Olenellus hozuclli (Meek), White, 1877, Idem, Vol. 4, pt. i, pp. 47-48, pi. 2, 

 figs. 4a-b. (Described and discussed. The specimen represented by 

 figures 4a-b is redrawn in this paper, pi. 36, figs. 4 and 4a.) 



Olenellus gilberti Walcott (in part) [not Meek], 1884, Monogr. U. S. 

 Geol. Survey, Vol. 8, p. 29, pi. 21, fig. 14 (not pi. 9, fig. 16 and pi. 21, 

 fig. 13 referred in this paper to Callavia nevadensis ; and not pi. 9, fig. 

 i6a, referred in this paper to Olenellus fremonti). (Described. Figure 

 14 is an outline drawing of the specimen figured by White, 1877, pi. 2, 

 fig. 3c, a specimen which is redrawn in this paper, pi. 36, fig. 2.) 



Not Olenellus hozuelli Walcott, 1884, Idem, pp. 30-31. pl- 9- figs. 15, I5a-c, 

 and pl. 21, figs. 1-9, 16-17. (Referred in this paper to Olenellus fre- 

 monti.) 



Olenellus gilberti (Meek), Walcott (in part), 1886, Bull. U. S. Geol. 

 Survey, No. 30, pp. 170-180, pl. 18, figs. I, la-b; pl. 19, figs. 2, 2a, 2b, 2k; 

 pl. 20, fig. 4; and pl. 21, figs. I and la (not pl. 18, fig. ic; pl. 19, figs. 2e, 

 2h, 2i ; pl. 20, figs. I, la-i, ik-m; and pl. 21, figs. 2 and 2a = Olenellus 

 fremonti; and not pl. 19, figs. 2c, 2d, 2f, and 2g = Callavia nevadensis) . 

 (Described and discussed. Figs, i and la, pl. 18, are copied from 

 White, 1877, pl. 2, figs. 4a and 4b ; figs. 2, 2a, 2b, and 2k, pl. 19, are copied 



