J90. CONTRIBUTION TO 



Illinois Geological Survey, plate 31, is an undersized T. woodmani, the form 

 described by Etheridge & Carpenter as T. meelii. 



The figures of our specimens will give an idea of the size and proportion of 

 the fossil. The greatest width of the fossil is at the distal ends of the ambu- 

 lacra. 



The three basal hollows give a strong triangular appearance to the bot- 

 tom. The stem base is triangular also. The basal plates are quite large and 

 can be plainly seen on a side view of the fossil. 



The horizon of our specimen is Warsaw Limestone, and the locality Green- 

 ville, Ind. Collection of Mr, G. K. Greene. 



PENTRE MITES KONINCKANUS, Hall, Rowley. 



Plate 57. Figs. 10, 11 (x 2). 



Our specimen shows a small radial plate between one of the fork pieces and the 

 basals. The deformity is not due to a break in the fork piece, but, as figure 10 

 shows, a plate inserted, perhaps from abnormal growth as the fossil is flattened 

 in that direction. It is a very interesting feature to say the least. 



The locality is Lanesville, Ind., Warsaw group. Collection of Mr. G. K. 

 Greene. 



NUCLEOCRINUS ANGULARIS, Lyon, Rowley. 



Plate 57. Fig. 12. 



The specimen figured seems to have an abortive sixth radial or fork piece, 

 much narrower than the other five and without a groove for the reception of 

 an ambulacrum. 



The interradial area in which the ridge is inserted is somewhat wider than 

 the three normal areas, about the same width, in fact, as the anal interradius. 



Such a feature as we have here illustrated, while it is occasionally observed 

 in true Pentremites and other sub-carboniferous blastoids, is rare in Nucleo- 

 crinus. 



Hamilton group, Speed's Cement Quarry, Clark county, Ind. Collection 

 of Mr. G. K. Greene. 



