PLATE 110. 
Page 
Fig. 1. Avicula gebhardi. 466 
1 a. A cast of the left valve of a specimen. 
1 b. A smaller specimen, in which the ribs are better preserved. 
Fig. 2. Avicula textilis, var. arenaria. 465 
2. The exterior surface of a weathered and exfoliated specimen of the left vaive. 
