192. CONTRIBUTION TO 



and the superimposed distichal. The sutures about this little plate are very 

 distinct. It would be idle to conjecture the possible origin of this little plate, 

 and yet, one can't help thinking it was due to an injury, despite the fact the 

 body gives no evidence of this. 



All three of the specimens of the above species here figured are from the 

 Upper Helderberg group, Falls of the Ohio. Collection of Mr. G. K. Greene. 



NUCLEOCRIJSIUS LUCINA, Hall, Rowley. 



Plate 57. Figs. 19, 20. 



The little blastoid here figured seems to belong to the above species. It is 

 longer than wide and distinctly lobed. The interradial sulcus is shallow, but 

 broader than the raised ambulacral area, from the middle of the body to the 

 base. The base is convex and the distal ends of the ambulacra are received 

 into little feet-like projections that are directed outward. The ornamentation 

 of the narrow, elongate areas bordering the ambulacra are rather strong raised 

 lines directed a little obliquely downward. The sulci are traversed longitudi- 

 nally by smaller lines. 



The summit is not unlike that of other Nucleocrini. 



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

 of G. K. Greene. 



A REVIEW OF DR. G. HAMBACH'S 



"Revision of the Blastoideae, with a Proposed New Classification and Description 



of New Species/^ 



BY R, R. ROWLEY. 



After stating a necessity for a revision of the Blastoidere, growing out of the accumulation 

 of new material, principally his own collection, Dr. Hambach proceeds to inform us that his re- 

 vision is based mainly upon three forms, namely: Pentremites sulcatus, florealis and conoideus, 



