PLATE LXI. 205 
ACROTHELE MATTHEWL MULTICOSTATA Matthew (p. 650). 
Fiagure 5. Top and side views of a ventral valve preserving the outer surface from Locality 21, Middle Cambrian shale 
at the base of the Paradoxides zone on Hanford Brook, St. John County, New Brunswick. U.S. Nat. 
Mus. Cat. No. 56633a. 
5a. Partly exfoliated ventral valve, with apex broken off. Locality 2t, Middle Cambrian shales at Hastings 
Cove on Kennebecasis Bay, St. John County, New Brunswick. U.S. Nat. Mus. Cat. No. 52000a. 
5b. Fragment showing the numerous costee. University of Toronto, Canada. (Locality unknown.) 
5e. Exfoliated dorsal valve associated with the specimen represented by figure 5a. U.S. Nat. Mus. Cat. No. 
52000b. 
ACROTHELE PRIMA (Matthew) (p. 653). 
[Pl LXIL, fig. 2. 
Figure 6. Top view of a small ventral valve from Locality 2g, Middle Cambrian sandstones of Division 1b1 of 
Matthew’s Protolenus zone, Hanford Brook, St. John County, New Brunswick. University of 
Toronto, Canada. Type specimen, figured by Matthew [1886, Pl. V, figs. 16 and 16a] as Acrothele 
matthewi prima. The specimen has been figured and refigured; see page 653 for record. 
6a. Natural cast of the exterior of a ventral valve from Locality 2i, Middle Cambrian limestone of Division 
1b3 on Hanford Brook, St. John County, New Brunswick. U.S. Nat. Mus. Cat. No. 56638a. 
6b. A ventral valve with a cast of the exterior of a dorsal valve beside it. Associated with the specimen repre- 
sented by figure 6a. U.S. Nat. Mus. Cat. No. 56638b. 
ACROTHELE AviA Matthew (p. 634). 
(Pl. LXII, figs. 1, la-k.] 
Figure 7. Exterior of a ventral valve from Locality 344b, Middle Cambrian shales of Division E3d of Matthew’s 
Etcheminian, Dugald Brook, Cape Breton, Nova Scotia. University of Toronto, Canada. Speci- 
men figured by Matthew [1902b, Pl. XVII, fig. 2a]. 
7a. Interior of a broken ventral valve from Locality 13n’, Middle Cambrian shales of Division E3e of Matthew’s 
Etcheminian, Dugald Brook, Cape Breton, Nova Scotia. University of Toronto, Canada. Type 
specimen, figured by Matthew [1899b, PI. IIT, fig. 1c]. 
7b. Interior of a dorsal valve from the locality represented by figure 7a. University of Toronto, Canada. 
Specimen figured by Matthew [1899b, Pl. III, fig. 14]. 
