444 THE CRINOIDEA CAIIERATA OF NOETH AMERICA. 



LobOCrinUS inflatUS (Rowley and Hare). 

 Plate XXXIV. Mgs. 18, a, h. 



1891. Batocrimis inflatus — Rowley and Haee ; Kausas City Scient, p. 102, Plate 2, Kg. 19. 

 Sjn. Batocriims bulbosus — Rowley and Hahe ; ibid., p. 114, Plate 3, Fig. 5. 



Calyx about as high a.s wide, small, subglobose, slightly flattened at the 

 anal side. Dorsal cup more than twice as high as the ventral disk, deep 

 bowl-shaped ; the plates heavy, almost flat and devoid of ornamentation ; 

 the suture lines somewhat grooved. 



Basals a little projecting, forming a low cup with a shallow concavity 

 at the bottom. Eadials wider than long, as large as both costals together. 

 First costal quadrangular, small, wider than high. The second costal gener- 

 ally heptangular, considerably larger than the first, wider as well as longer. 

 Distichals two, rather large, those of the anterior ray, and the outer ones of 

 the posterior rays, supporting directly the arms ; while the inner ones bear a 

 palmar on each side. The anterior rays of the tjpe specimen are abnormal ; 

 the ray to the right is formed like the anterior one, and has but two arms, 

 that to the left supports palmars on both' distichals, and has four arms.* 

 Arm facets somewhat projecting and deeply concave; they point slightly 

 upwards, and are arranged in groups. Interspaces between the rays wider 

 than those between the main divisions of the ra^'s, and considerably wider 

 than the spaces between arms of the same division. There are no respira- 

 tory pores near the arm openings. Arm structure imknown. Regular inter- 

 brachials : 1, 2, 2 ; the first very large, as wide as high ; the two upper ones 

 interposed between the arm-bearing pieces, and followed by disk plates. The 

 anal plate supports : 3, 3, 2, and one plate, the latter being designated more 

 properly as a plate of the disk. Ventral disk small, the anal tube occupying 

 almost one third of its diameter ; the plates nodose, and of nearly uniform 

 size, even the orals cannot be distinguished. Anal tube heavy at the base 

 and central. 



Horizon and Locality. — Lower part of the Lower Burlington limestone, 

 Louisiana, Mo, 



Tyjoes in the collection of Mr. R. R. Rowley. 



* In anotlier fragmentary specimen in Mr. Rowley's colled ion, the rigbt antero-lateral ray, the only 

 one seen, has three arm openings, one above tlie distichals, the two others abore a palmar. This is prob.-ibly 

 the normal arrangement, and there are fourteen arms to the species. The type of B. bulbosus curiously also 

 has but two arms to the right and four to the left. 



