OLENELLUS AND OTHER GENERA OF MESONACID.E 289 



Olenellns {?) kjernlfi (Linnarsson), Matthew, 1886, American Journ. 

 Sci., 3d ser., Vol. 31, pp. 472-473. (Identifies species from Newfound- 

 land and expresses doubt as to generic reference.) 



Olenellus kjerulU (Linnarson), Holm, 1887, Geol. Foren. i Stockholm 

 Forhandl., Vol. 9, Hafte 7, pp. 493-522 (499-512 in particular). (De- 

 scribed and discussed in Swedish, figuring a complete restoration of 

 the dorsal shield [pi. 14, fig. 2^ which has been widely copied, see pi. 

 27, fig. I of this paper.) 



Paradoxidcs {Gen. ?) kjcriM Matthew, 1888, Canadian Record Sci., 

 Vol. 3, pp. 7S-7^- (The species is discussed as the representative of a 

 new genus intermediate between Paradoxides and Olenellus and 

 Matthew says : " It is to be hoped that his countrymen will see reason 

 to connect Holm's name with this new genus.") 



llolmia kjerulH (Linnarsson), Marcou, 1890, American Geologist, Vol. 5. 

 pp. 365-366. (The species is discussed and Marcou accepts Matthew's 

 suggestion [1888, p. 76I and places the species under Holinia.) 



Olenellus (Holinia) kjehdii (Linnarsson), Walcott, 1891, Tenth Ann. 

 Rept. U. S. Geol. Survey, p. 635, pi. 86, fig. 2; and pi. 93, fig. 2. (The 

 figure on plate 86 is copied from Walcott, 1886, pi. 20, fig. 2 ; figure 2. 

 pi. 93 is copied from Holm, 1887, pi. 14, fig. 2.) 



Cephalacanfhus kjerulU Lapworth, 1891, Tenth Ann. Rept. LT. S. Geol 

 Survey, by Chas. D. Walcott, pp. 640-641. (Compared with " Cephala- 

 canthus callavei.") 



Olenellus {Holinia) kjendU (Linnarsson), Cole, 1892, Natural Science, 

 Vol. I, p. 343, text fig. 3. (Gives outline figure of the restoration of the 

 dorsal shield by Holm, 1887, pi. 14, fig. 2.) 



Holinia {Olenellus) kjerulfi Peach, 1894, Quart. Journ. Geol. Soc. Lon- 

 don, Vol. 50, p. 671, pi. 32, fig. 12. (Mentioned. Figure 12 is copied 

 from Holm, 1887, pi. 14, fig. 2.) 



Olenellus kjeriilii (Linnarsson), Koken, 1896, Die Leitfossilien, p. 7, text 

 fig. 2. (Reproduces restoration of dorsal shield by Holm [1887, pi. 

 14, fig. 2]. On page 352 the species is placed und' c Mesonacis.) 



Olenellus {Holmia) kjerulfi (Linnarsson) Frech, 1897, Additional plates 

 inserted in 1897 in Letha;a geognostica, pt. i, Lethsea Palaeozoica, 

 Atlas, pi. la, fig. 13. ( Figure 13 is copied from Holm, 1887, pi. 14, 

 fig. 2.) 



Holmia kjerulfi (Linnarsson), Moberg, 1899, Geol. F(>ren. i Stockholm 

 Forhandl., Bd. 21, Hafte 4, p. 318. pi. 13, fig. 3. (Mentioned at several 

 places in the text. The figure is copied from Holm, 1887, pi. 14, fig. 2. ) 



Holmia kjerulfi Lindstrom, 1901, Kongl. Svenska Vet.-Akad. Handlingar, 

 Vol. 34, No. 8, p. 57. (Calls attention to the "maculae" on the 

 hypostoma.) 



Dr. Holm's memoir [1887, pp. .493-522] on this species is so com- 

 prehensive and so well illustrated that I shall not attempt to repro- 

 dtice it further than to illustrate his restoration of the dorsal shield 

 [pi. 27, fig. 7]. 



The most nearly related species is Holmia luudgreiii Moberg [pi. 

 40, figs. 4-7]. It differs from the latter in many details and, as 



