372 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 



BatOCrinus quasillus (Meek and Worth.). 

 Plate XXVIII. Figs. 4a, h. 



1869. Batoeriims quasiHiis — Meek and Wortben; Proceed. Acad. Nat. Sci. PLila., p. 352; also Geol. 



Rep. Illinois, Vol. V., p. 369, Plate 5, Kg. 3. 

 1881. Batoeriims quasillus — W. and Sp. ; Revision Palaeocr., Part II., p. 167 (Proceed. Acad. Nat. Sci. 



Phila., p. 341). 



Height of the calyx eqital to its width ; the ventral disk occupying fully 

 one half. Dorsal cup wide at the bottom, rapidly spreading near the arm 

 bases, so as to place the upper rows of brachials in a horizontal position. 

 Plates extremely heavy and evenly convex. 



Basal cup three times as wide as high, hexagonal, thickened at the lower 

 end ; the interbasal sutures slightly indented ; the bottom deeply depressed 

 for the reception of the column. Radials nearly twice as wide as long, the 

 upper face concave. First costal very small ; the second more than twice 

 as long as the first. Distichals two ; followed by two rows of two palmars 

 each, except in the divisions facing the anal side, where the first distichal is 

 axillary and supports an axillary palmar, and this 2X2 post-palraars. Arms 

 twenty-two to twenty-four, arranged at equal distances, openings directed 

 horizontally. Interbrachials two, the upper very small, arched over by the 

 palmars. Anal plate a little narrower and longer than the radials, succeeded 

 by three good-sized plates, and these by a single one. Ventral disk highly 

 convex, inflated near the periphery so that its sides project sometimes be- 

 yond tho.se of the dorsal cup. Orals and radial dome plates somewhat tu- 

 berculous, and twice as large as the surrounding pieces which are merely 

 convex. Anal tube very strong, composed of thick plates ; its length not 

 known. 



Horizon and Locality. — Lower Burlington limestone ; Burlington, Iowa. 



I'lJiye in the Museum of Comparative Zoology. 



Batocrinus lepidns (Hall). 

 Plate XXVIIL Figs. S and 3. 



I860. Actiitoerinus lepidus — Hall; Suppl. Geol. Rep. Iowa, p. 33. 



1881. Batocrinus lepidus — W. and Sp. ; Revision Palseocr., Part II., p. 167. 



1893. Batocrinus lepidus — VThitfield ; Mem. Amer. Mus. Nat. Hist., Vol. I., p. 16, Plate 1, Pigs. 17, 18. 



A little larger than the two preceding species. Calyx wheel-shaped, 

 abruptly spreading beneath the arm bases ; ventral disk depressed convex, 

 with a central anal tube rising abruptly from the summit. Plates smooth, 



