ACTINOCRINIDJE. 633 



Teleiocrinus liratus Hall. 

 PMe LX. Fig. 3. 



1861. Actinoerinus liratus — Hall ; Suppl, G?ol. Rep. Iowa, p. 1 (figured 1872, Bull. I, N. Y. State Mus. 



Nat. Hist., Plate i, Kg. 3). 

 1861. Strolocnmis liratus — Meek aud Wokthen ; Geol. Rep. Illinois, Vol. II., p. 190, and 1873, ibid.. 



Vol. v., p. 355, Plate 7, Figs. 2a, b,c. 

 1881. Teleiocrinus liratus — W. aud Sp. ; Revision Pateocr., Part II., p. 119. 



Syn. Actinoerinus subumbrosus Hall ; 1860, Suppl. Geol. Rep. Iowa, p. 3. 



Larger- than the two preceding species, the calyx more elongate, the teg- 

 men higher, the anal tube much heavier, the ornamentation less rugose, and 

 the column stronger and circular instead of angular. Calyx urn-shaped, 

 elongate-.obconical to the base of the rim. Sides of the dorsal cup expand- 

 ing gradually from the basals to the top of the distichals ; the rim decagonal, 

 curving obliquely outward and upward, conspicuous but not broad. Sur- 

 face of plates slightly convex, covered with well defined radiating ridges, 

 which in parallel sets of three or four imite at the middle of the plates in 

 small, transverse or arched, angular nodes, producing a neatly sculptured 

 ornamentation. 



Basals forming a broad and deep, gradually expanding cup, slightly thick- 

 ened at the lower margins ; the interbasal sutures somewhat depressed, but 

 not actually grooved. Radials generally a little longer than wide. First 

 costals rarely more than one third the size of the radials ; the second as 

 large as the first, and both as long as wide. Distichals slightly smaller 

 than the costals. The branching of the two main divisions takes place 

 from opposite sides, as usual in the genus ; there being five bifurcations 

 in each divi.sion, or twelve arms to the ray. Arms of moderate size, some- 

 what flattened on the back, and covered with four rows of rather faint 

 nodes. Interdistichals generally nine : 1, 2, 2, 2, 2, at the regular sides, 

 and about thirteen at the anal side. Anal plate as large as the radials. 

 Interdistichals one. Ventral disk higher than in the preceding species, 

 gently curving upward from the margin of the rim, and gradually pa.ss- 

 ing into the anal tube ; its outer margin distinctly plicated. It is com- 

 posed of numerous irregularly arranged plates, small pieces being interposed 

 between larger ones, but, as a rule, the plates decrease in size toward the 

 arm bases. Orals indeterminable. Anal tube very long and large through- 

 out ; composed of similar plates to those of the disk, but they are smaller 



