33 



Family ICHTH YOCRIN IDAE. 



lecanockinus oswegoensis u. sp. 



Plate III, Fig. 15, ciew on the right of the ray on the azygous 

 side; Fig. 16, azygous side; Fig. 17, view of the ray be- 

 tween the azygous area and the area shoum in 

 Fig. 15, and which bears four pri- 

 mary radials. 



Species small, subelliptical in general outline. Calyx obconoidal, 

 bulged on the right of the azygous area, truncated for a small, 

 round column, which is composed of thin plates, exposing the ser- 

 rated edges for the union of the plates, and having a very small col- 

 umnar canal. Plates of the calyx slightly convex and covered with 

 granules; sutures distinct. 



The three basals form a low pentagonal cup, about twice the 

 diameter of the column. The subradials are of unequal size, the 

 one below the azygous area is the larger and has seven sides, two 

 of the others are hexagonal and two pentagonal. There are four 

 primary radials in the series on the right of the azygous area and 

 three in each of the other series. The first primary radials are 

 unequal in size, the one on the right of the azygous area being 

 the smaller and having only five sides, the others are hexagonal 

 or heptagonal, depending upon whether they are truncated upon 

 one or both superior lateral angles by the first interradials. The 

 second primary radials are short and wide and of very unequal 

 size, the one on the right of the azygous area is the larger and is 

 hexagonal, the others are subquadrangular, but when a superior 

 lateral angle is truncated by a second interradial they become pen- 

 tagonal. Four of the third primary radials are short, wide, pen- 

 tagonal and bear upon the upper sloping sides the secondary radi- 

 als or free arms; the other third primary radial is shoi t, wide, 

 Bubquadrangi;lar though slightly truncated at the superior lateral 

 -5G. 



