2)2 I.ARVIFORM CRIXOIDS 



are not associated with any other crinoid with which they might be connected 

 as aberrant examples. It is necessary therefore to follow Wanner in his 

 opinion that Lageniocrinns is a valid genus. 



Lageniocrini s cassidus J. M. Weller, n. sp. 

 Plate II, figs. 6a-b 

 Description. — The calyx is subglobular and very small, the height of the 

 holotypc being .74 mm. and the largest specimen obtained .92 mm. The 

 sutures between the plates are not clearly visible, but the calyx 

 appears to be composed of three rings of plates which are 

 interpretated as, ( 1 ) a low more or less compressed infra- 

 basal disc, (2) five equal basals, and (3) five approximately 

 equal orals. Of these the basals make up the greater part of 

 the height of the calyx. 

 interpretation T] ie infrabasal disc is somewhat variable in the different 



of the calyx 



structure or specimens. In the holotvpe it is low and platelike with a large 



Lagemocrinus * J l * 



cassns (com- round proximal stem facet. In some of the others however 



pare with PI. l 



ii, fig. 6a). ^ i s somewhat higher and possesses a smaller stem facet and 



consequently is obtusely funnel-like in form. It is pierced by a single small 

 central canal. 



The size and shape of the basals are somewhat difficult to describe owing 

 to the questionable position of the sutures bounding them above. Interpreted 

 in accordance with figure 5 they are somewhat less than twice as high as wide, 

 rounded below, evenly truncated above and bounded laterally by nearly parallel 

 sides. Near the middle they are swollen into broad rounded areas which 

 stand out prominently above the infrabasal disc. Above each of these swell- 

 ings is a diamond shaped area formed of two flat equilaterally subtriangular 

 areas, the lower of which occupies the upper part of the basal while the upper 

 one is formed by the outer proximal portion of the superjacent oral. These 

 areas slope inward slightly and meet each other at an obtuse angle. 



The oral crown forms a nearly circular cover extending over the entire 

 ventral surface of the body. It is composed of five equal oral plates which 

 are disposed in series above the basals. The interoral sutures are not clearly 

 shown but they appear to be situated at the bottoms of five radiating troughs 

 which extend outward from the center of the oral crown. 



Xo anal opening is present in the side of the calyx. 



Remarks. — This species deviates greatly from the simple pyriform shape 

 of the genotype but its structure conforms perfectly to that of Lagcniocrimts 

 and it is referred to this genus without hesitation. 



Occurrence. — Collected from limestone near the base of the Pennsyl- 

 vanian near the center of the N. J / 2 sec. 35, T. 21 N., R. 9 W., Warren County, 

 Indiana. 



