INDIANA PALEONTOLOGY. 87. 



Of the character of the anal opening, spiracles and central opening nothing 

 is known from the condition of the specimen. 



The ornamentation of the deltoids is rows of heavy granules, often more 

 or less confluent, parallel with the lower sutures or broadly V-shaped. 



The radials are ornamented by strong rows of more or less confluent gran- 

 ules, parallel with the radio-deltoid and radial sutures or L-shaped inverted. 

 Along the radio-interradial sutures, thei-e is a sunken band or zone of small 

 granules, and a groove along the radial sutures, broadest above. 



This is a handsome species and might be mistaken for O. graaulatus, but 

 differs from that species in its strongly lobed character, longer deltoids, definite 

 arrangement of the granules and in the depressed radio-interradial zone. More- 

 over it comes from a much lower horizen. 



The specific name is for Dr. Otto Oppelt, of New Albany, Ind. 



The type specimens came from the Knobstone group, two miles north of 

 New Albany, Ind., and are in the collection of Mr. G. K. Greene. 



Figures 18, 19, 20 are restored views of the species. 



PENTEEMITES, CONOIDEUS. Hall, Rowley. 



Plate 29. Figs. 28, 29, 30, 31, 32, 33, 34. 



This very abundant blastoid shows great diversity in both size and outline 

 Two forms deserve particular notice, differing so far from the typical conol- 

 deus as to be entitled to varietal names. For one of these we propose : 



PENTRE MITES CONOIDEUS, var. Perlongus, n. var. (Rowley.) 



Plate 29. Fig. 28. 



The greatest lateral diameter of the body is above the tips of the ambu- 

 lacra, so that the form is almost barrel-shape, but with the greater end diame- 

 ter at the base. Like the typical form, this variety is strongly lobed ; while 

 from its extremely elongate shape, the plates are proportionally greater in 

 length and less in width than in the broader forms. In outline this form is 

 much like Pentremites elongatu s ii^'om. the Burlington limestone. 



In the author's collection is a specimen from near Flag Pond, Va., so con- 

 tracted at the base as to give a truly elongate elliptical outline on side view. 



The type of this variety is from the Warsaw limestone at Lanesville, Ind., 

 and now in the collection of Mr. G. K. Greene. 



For the other form we offer the name. 



