NEW SPECIES OFPELECYPODS. 
11 
Family, Pernid^j Zittel. 
Genus, Inoceramus Sowetby. 
Inoceramus dowlingi n. sp. 
Plate III, figures 7, 8. 
Description. The most important characters of this species are the 
semi-quadrate outline, compressed form, small terminal beaks, and eVenly 
curved, regular, concentric ridges; it thus resembles Inoceramus neoco - 
miensis d’Qrbigny from the Lower Greensand of England and the Barre- 
mien of France. It differs from the European species in its longer postero- 
dorsal margin, shorter anterior margin, aSnd less high outline. The strength 
of the concentric ridges near the anterior margin varies from 4 pr. 10 mm., 
to 6 pr. 10 mm. Height 25 mm., length 24 mm. This species is named 
after D. B. Dowling. 
Horizon. Rare in the Clearwater formation, Athabaska river, Alberta. 
Collection. Victoria Memorial Museum; holotype, Cat. No. 5398; 
paratype, Cat. No. 5399. 
Family, TJnionDjE Fleming. 
Genus, Unio Retzius. 
t 
Unio dowlingi n. sp. 
Plate IV, figure 2. 
Description. There is no Cretaceous species similar to this. The 
nearest species in general form is Unio haydeni Meek from the Eocene of 
Utah. 1 Compared with this, the^ Dun vegan Species has a thicker shell 
and a more evenly rounded post-umbonal slope. Height 21 mm., length 
30 mm. This species is named after D. B. Dowling. 
Horizon. Common in the Dunvegan formation, Peace river, Alberta. 
Collection. Victoria Memorial Museum; holotype, Cat. No. 5400. 
Family, Trigoniidjs Lamarck. 
Genus, Trigonia Boug. 
Trigonia albertaensis n. sp. 
Plate IV, figures 3, 4. 
\ 
Description. The ornamentation is very characteristic; in the posterior 
part of the shell five to six costse are directed downward and backward; 
anteriorly the costse are flat V shaped, 135 to 140 degrees, and open down- 
ward; about four small radiating costse are present on the posterior dorsal 
area. Height 28 mm., length 44 mm. 
Horizon. Rare in the Peace River formation, Peace river, Alberta. 
Collection . Victoria Memorial Museum; holotype, Cat. No. 5401; 
paratype, Cat. No. 5402. 
x White, U.S. Geol. Surv., 3rd Ann. Rept., p. 435\ 
