120 WELLER. 



Melocrinus subglobosus n. sp. 

 (PL XIV. Fig. I.) 



Calyx sub-globular, sides convex from the tops of the basals 

 to the arm openings. Cross section, as seen from above exclu- 

 sive of the nodes, circular, greatest diameter at about the top of 

 the first costals. The plates of the dorsal cup ornamented with 

 remarkably large nodes, the radials, first costals and first and 

 second interbrachials often bearing nodes whose diameter is 

 nearly equal to the width of the plates. The larger nodes rise 

 abruptly from the general surface of the plates, with subparallel 

 sides and with an elevation equal to their diameter. 



Basals four, projecting laterally into more or less prominent 

 nodes, columnar facet large, often somewhat depressed between 

 the nodes of the plates. Radials large, heptagonal and hexag- 

 onal, strongly nodose. First costals hexagonal, smaller than 

 the radials, strongly nodose ; second costals pentagonal or 

 heptagonal, smaller than the first, bearing a much smaller and 

 lower node. Distichals smaller than the last costals, the second 

 pair free and attached to the first by a conspicuous sub-circular 

 facet with numerous fine radiating ridges. First interbrachials 

 hexagonal in the four regular interradial areas, as large as the 

 first costals, and bearing similar nodes, followed by two smaller 

 plates in the second row, one of which often bears a conspicuous 

 node similar to those of the lower plates and the other with a 

 much lower and smaller inconspicuous node similar to those 

 upon the second costals ; above the second row the interradial 

 spaces are filled with numerous smaller plates which lead up to 

 those of the dome. The posterior interradius with a heptag- 

 onal nodose anal plate in the first row, similar, except in out- 

 line, to the first regular interbrachials, followed by three plates 

 in the second row. 



Ventral disk subhemispherical, composed of small, polygonal, 

 nodose plates of nearly equal size, and surmounted by the base 

 of a subcentral proboscis whose height cannot be determined. 



Remarks. M. stibglobosus is most nearly allied to the asso- 

 ciated species M. nodosus. It differs from this species : i. In 

 its subglobose form, with the vault subhemispherical rather than 



