INCERT^D SEDIS. 
Spong. 33 
Halicliondrites graphitiferus , Upper Laurentian of St. John, N. B., 
Matthew, (2) pp. 43 & 44, fig. 2 ; H. confusus , Siluro-Cambrian, Metis, 
Hinde ; in Dawson, p. 52, fig. 23 : n. spp. 
Heterospongia , Ulrich, diagnosis and remarks on ; t H. aspera , sub- 
ramosa, Ulrich, Cincinnati Group; James, pp. 71 & 72. 
Leptopoterion , Ulrich, diagnosis ; James, p. 54. 
Microspongia , Miller & Dyer, diagnosis ; M. gregaria, Miller & Dyer, 
subrotundus, James, from Cincinnati Group ; James, pp. 54-56, fig. 1. 
Mceandrospongia cavernosa , Rcem., from Cretaceous, Russia ; Piat- 
NITZKY, p. 118. 
Meandroptichium impressum , Sing., M. sp., from Cretaceous, Russia ; 
Piatnitzky, p. 11. 
Palceacis cavernosa , n. sp., Subcarboniferous, Indiana, Miller, pp. 4 
& 5, pi. i, figs. 5 & 6. 
Pulccospongia prisca is a real Sponge, and not the result of worm 
tubes ; Bornemann, pp. 492-494. P. prisca , Bornemann, is not a 
Sponge, nor remains of animals or plants, but the result of mechanical 
causes; Rauff, (2) pp. 92-100. 
Pattersonia , S. A. Miller, diagnosis and remarks on ; +P. difficilis, S. A. 
Miller, tuberosa, Beecher sp., Cincinnati Group, Cincinnati ; James, pp. 
68 & 69. 
Rhombodictyon, Whitfield, diagnosis ; James, p. 57. 
R. globosus, n. sp., James, pp. 57 & 58, fig. 2, from’Cincinnati Group, 
Cincinnati. 
