OLENELLUS AND OTHER GENERA OF MESONACID.E 2/9 



The associated fossils are Microiiiitra nisits Walcott, Botsfordia 

 coclata (Hall), Hyolithes, DisciiicUa, fragments of large species of 

 Callavia, and Protypus sp. ( ?) 



Formation and Locality. — Lower Cambrian (ar) a limestone 

 boulder enclosed in a conglomerate of probable Upper Cambrian age, 

 in a railroad cut 2 miles {^.2 km.) zvest of the railroad station at 

 Bic, Province of Quebec, Canada. 



CALLAVIA BROGGERI Walcott 



Plate 27, Figs. 1-6 



Olcncllus broggcri Walcott, 1888, Name proposed at exhibition of speci- 

 mens at the International Geological Congress, London. 



Olenellus broggcri Walcott, 1888, Nature. Vol. 38, p. 551. (Name used 

 in geologic section.) 



Olenellus (Mcsoiiacis) broggcri Walcott, 1889, American Journ. Sci., 3d 

 sen, Vol. S7j PP- 3/8-380. (Description of localities and horizon in 

 geological section). 



Olenellus (Mesoiiacis) broggcri Walcott, 1890, Proc. U. S. National 

 Museum, Vol. 12, p. 41. (Describes species and compares it with other 

 species of Olenellus.) 



Holmia ? bra:ggcri (Walcott), Marcou, 1890, American Geologist, Vol. 5, 

 PP- Zl^-liT^- (Contends that this species is not a true Olenellus, and 

 refers it tentatively to Holmia.) 



Olcncllus (Holmia) broggcri Walcott, i8gi. Tenth Ann. Rept. U. S. 

 Geol. Survey, pp. 638-640, pi. 91, fig. i; pi. 92, figs, i, la-h. (Described 

 and discussed. Figure I, pi. 92, is copied in this paper, pi. 27, fig. i, 

 and pi. 44, fig. 4. Figures ic, id, le (in part), ig, and ih, pi. 92, are 

 copied in this paper, pi. 27, figs. 5, 6, 2, 4, and 3 respectively.) 



Cephalacanthus broggcri Lapworth, 1891, Tenth Ann. Rept. U. S. Geol. 

 Survey, by Chas. D. Walcott, p. 641. (Compared with " Cephalacanthus 

 callavei.") 



Callavia broggcri Matthew, 1897, American Geologist, Vol. 19, p. 397, 

 footnote. (New genus proposed.) 



Olcncllus (Holmia) braggeri (Walcott), Pompeckj, 1901, Zeitschr. 

 Deutschen geol. Gesellsch., Vol. 53, Heft 2, pi. i, fig. 10. (Mentioned 

 frequently on pages 14-17 in a discussion of the relations between 

 Olenopsis and various genera of the Mesonacidae. Figure 10 is copied 

 from Walcott, 1891, pi. 91, fig. i.) 



Olcncllus broggcri (Walcott), Bernard, 1894, Quart. Journ. Geol. Soc 

 London, Vol. 50, p. 423. (Calls attention to the occipital spine as a 

 modification of the " dorsal organ" of Apiis.) 



Holmia broggcri (Walcott), Peach, 1894, Idem, pp. 672 and 673. (Refers 

 to this species in discussion of Olcncllus.) 



Not Olenellus (Holmia) broggcri Burr. 1900, American Geologist, Vol. 

 25, pp. 43-45- (Referred in this paper to Callavia crosbyi.) 



Not Olenellus (Holmia) broggcri Graeau, igoo, Occasional Papers, Bos- 

 ton Soc. Nat. Hist., No. 4, Vol. i. pt. 3. pp. 662-664, pi. 33, figs. la-j. 

 (Referred in this paper to Callavia crosbyi.) 



