72 PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. 78 



tions of the Swedish species is correct, it may be distinguished as a 

 variety by its more prominent and sharply rounded anterior extremity. 



Occurrence. — Lower Cambrian (Hanfordian Protolenus zone, divi- 

 sion Cl62), Hanford Brook, St. Martins, New Brunswick. Seven 

 specimens in the United States National Museum, collected b}^ Doctor 

 Walcott in Greenwich Township, Washington County, N. Y., occurred 

 in an arenaceous limestone referred by him to the Lower Cambrian. 



Cat. No. 56467, U.S.N.M. 



INDIANA ANDERSSONI (Wiman) 



Plate 9, Figures 22-25 



Aparchites? anderssoni Wiman, Bull. Geol. Instit. Upsala, vol. 6, pt. 1, 1902, 

 p. 45, pi. 1, figs. 25-28. 



All the available information concerning this species is contained in 

 the description and figures published by Wiman. Judging more 

 especially from the latter, the species is thought to be founded on a 

 crushed example of an Indiana closely related to /. dermatoides and 

 /. secunda. Compared with the latter the only difference noted that 

 is not manifestly the result of injury lies in the more prominent and 

 narrowly rounded anterior extremity. Even this difference may have 

 been produced by the injury and loss of the anterior cardinal angle. 

 Only a restudy of Wiman's type specimens with these possibilities in 

 mind can determine the validity of the species and its true relations 

 to the American species. 



Occurrence. — Lower (? Middle) Cambrian, Glauconite sandstone; 

 Eggegrund, Sweden. 



INDIANA PYRIFORMIS (Matthew) 



Plate 9, Figures 11, 12 



Primiiia pyriformis Matthew, Trans. Roj'al Soc. Canada, ser. 2, vol. 4, sect. 4, 



1898, p. 132, pi. 1, figs. 3 a-c. 

 Indiana pyriformis Matthew, Canadian Rec. Sci., vol, 8, 1902, p. 461. 



This form is represented in the Matthew's collection of types by 

 two specimens from Long Island, New Brunswick, both left valves of 

 exactly the same shape. The surface in both is somewhat injured by 

 exfoliation and corrosion, but retains suflEicient evidence of its character 

 to prove that it is finely punctated as in /. secunda. Carefully com- 

 pared with the types of that species, few differences, and hardly any 

 of consequence, were noted save in the matter of size, the types of 

 /. pyriformis being nearly twice as long as those of I. secunda. How- 

 ever, as two specimens from Hanford Brook and two others from 

 Washington County, N. Y., in the United States National Museum, 

 hold the same dimensions, and as none of intermediate size is 

 known, it is thought advisable to maintain the two forms as dis- 



