292 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 53 



for about one-half their length and then curve evenly outward and 

 backward, and narrow gradually to a point ; the pleurse are thus 

 distinguished sharply from those of Holmia kjernUi [pi. 2y, fig. 7] ; 

 pleural furrow oblique, clearly marked, and deepest near the in- 

 terior end. 



Pygidium with a nearly circular outline without transverse fur- 

 rows ; its marginal rim is narrow on its anterior end, increasing 

 •slightly in width toward the posterior side where it narrows rapidly 

 to the posterior median line, and thus gives a notched appearance 

 to the posterior margin. 



The surface is marked by irregular, fine ridges that form a more 

 ■or less irregular network. 



The largest cephalon has a length of 28 mm., width 54 mm., con- 

 vexity about 10 mm. 



Observations. — This species is most closely related to Holmia 

 kjcriilfi [pi. ly, fig. 7]. It dififers in the outline of the glabella, 

 genal angles, pleurae of thoracic segments, and hypostoma. The 

 outline of the glabella is intermediate between that of Holmia [pi. 

 27, fig. 7] and that of Callavia [pi. 27, fig. i]. 



The fossils found in association with this species are, according 

 to Moberg [1899, p. 329], a patelloid shell and Hyolithcs degeeri 

 Holm. 



Formation and Locality. — Lower Cambrian : a block of sand- 

 stone (390V) collected west of Tumbyholm, north-northeast of 

 Smedstorp, west of Simrisham, Province of Kristianstad, Sweden 

 [Moberg, 1899, p. 328]. 



Dr. Moberg [1899, p. 329] states that he also found this species 

 •south from Gladsax Church. 



HOLMIA ROWEI, new species 



Plate 29, Figs, i-ii 



Holmia mzvci Walcott, 1908, Smithsonian Misc. Coll., Vol. 53, No. 5, p. 

 189. (Name used in No. 12 of section; the species does not occur in 

 No. 3, nor in the Waucoba Spring section, pp. 187-188. The specimens 

 identified with this species from 3 of the section are referred in this 

 paper to Olcnellus argenfus and to Olcnellus gilbcrti; those from 3d 

 of the Waucoba section [pp. 187 and i881 are referred to Wanneria 

 gracilc ; and those from id and 2J [p. 186I arc not specifically iden- 

 tified.) 



Dorsal shield elongate oval, rather strongly convex over the ceph- 

 alon and less so over the thorax and pygidium. Cephalon semi- 

 circular in outline, strongly convex, one-third the length of the 

 • dorsal shield : bordered bv a strong, rounded rim that is continued 



