10 



BATOCRINDS HONOBABILIS, n. Sp. 



Plate I, Fig. 0, azijcjons view; Fig. 10, opposite side same specimen. 



Species larf>e, with a vault less than half the height of the 

 calyx. Calyx nearly as long as wide, hexagonal below and most 

 rapidly expanded near the top. Plates tumid and subspinous, 

 Ambulacral openings directed upward at an angle of thirty degrees. 

 Column large and radiately furrowed. 



Basals stand upright and form a hexagon about twice as wide 

 as high and about twice as wide as the diameter of the column. 

 They are beveled towards the sutures and flattened on the sides 

 and extend to wedge-shaped end below the commencement of the 

 column, so that the calyx will stand on the cuneiform edges. First 

 primary radials large, nearly as long as wide, three hexagonal, 

 two heptagonal. Second primary .radials a little wider than long, 

 quadrangular. Third primary radials abut upon two interradials 

 at one or both ends, and consequently four of them are hexagonal 

 and one heptagonal; the heptagonal plate is shown in figure 10. 

 They are very unequal in size, but each one is axillary and sup- 

 ports upon each of its two superior sides two secondary radials. 

 The secondary radials are rather long and as large as the second 

 and third primary radials, the second secondary radials are axil- 

 lary and each supports on its superior sloping sides three tertiary 

 radidals, and in some rays four tertinry radials. By this arrange- 

 ment there are four arms in each radial series or twenty arms 

 and twenty ambulacral ojjenings to tlie vault in this species. There 

 are no intersecondary or intertiary plales. 



The regular interradial arms are much elongated and the two 

 shown in figure 10 have each four plates, one in the first range, 

 two in the second and one in tlie third. But in each of the other 

 regular interradial areas there are three plates in line, tiie third 

 one being the smallest. In the azygous area there are seven plates 

 and it is somewhat trapezoidal in outline. The first one is as 

 long as wide, larger than a first primary radial and in line with 

 them. It is followed in the second range by three large plates 

 and these by two in the third range aud one in the fourth, which 

 separates the first tertiary radials, and in these rays there are 

 four tertiary radials. 



The vault is subhemispherical or broadly rounded and bears a 

 small subcentral proboscis which is liroken oil' in our specimen. 

 It is covered with large, tumid, polygonal plates, each of whicli 

 bears a central mode. The interradial areas are slightly depressed 

 between each pair of arms where there is an elongated plate and 



