A third specimen is parallel to the second in the rock and within 3 
mm. of the latter. At the top of the specimen the casts of the interiors 
of 4 camerse still are partly preserved. At the lowest of these camerse the 
maximum diameter is 29 mm, and the minimum diameter is 21 mm. 
Twelve camerse occur in a length equal to the maximum diameter of the 
conch. The concavity of the septa is moderate. The siphuncle is central 
in location. The maximum diameter of its septal neck is 4 mm. and its 
minimum diameter is 2*8 mm. where the maximum diameter of the 
conch is 32 mm. The length of the septal neck is about 0*6 mm., and 
its lower margin curves strongly outward, indicating a nummuloidal form 
of connecting ring. The passage of the siphuncle through the septum is 
narrowed to 2 = 6 by 1*8 mm., probably owing to a calcareous deposit 
lining the interior of the septal neck, as in other Actinoceroids. Specimen 
No. 7980 (J), National Museum of Canada. 
Locality and Horizon, Two miles northwest of Clementsvale, N.S. 
Lower Devonian. 
Types. Nos. 7980a, National Museum of Canada. 
