292 TRANS. OF THE ACAD. OF SCIENCE. 
PRODUCTUS SEMIRETICULATUS, Mart. sp. 
This widely distributed species is coneninet in Ri lg 
SoBe ctiin from the White Limestone 
than in the example figured we De Koninck, which are gee 
ally marked with a broad shallow sinus. One of our fossil 
exhibits a group of fifteen tubes on a smooth space ba 
der the reticulated portion of the sides, arranged as 
ted in De Koninck’s figures of some ——— from Vise, iss Be 
gium. (Monog. Prod. et Chon., pl. IX., fig. 18, ¢.) — 
- AvtosTrcErs Gvapatupensis, WV. sp. 
a Wantrat valve large, outline subelliptical, gibbous, 
Cha 
th y fr besk 
waver’ tes e bees. es. — e samedi io 5 
