MELOCRINID&. 289 
Basals large, forming a rounded cup, with a narrow columnar attachment. 
Radials unusually large, fully four times the size of the costals, and about 
three times as long; very little sloped to meet the first interbrachial. First 
costals somewhat larger than the second. The two proximal palmars incor- 
porated into the calyx, the others free. Arms ten. Interbrachials compar- 
atively small, one and two at the regular sides; the anal side wider, and 
composed of three plates in the first row. Ventral disk constructed of small 
irregular pieces. 
Horizon and Locality. — Same as last. 
Remarks. — Hall’s figures 5 and 6, on Plate 13 of the 28th Rep. N. NG 
State Museum, are incorrect and misleading. The first costals are represented 
twice as large as they actually are, and the ornamentation is also somewhat 
different in the specimens. In the 20th Rep. of the same series, Plate 10, 
Fig. 1, Hall figures a cast from the Niagara group of Racine, Wisc., described 
on page 379 under the name of Actinocrinus (Saccocrinus) semiradiatus, which 
may possibly be a large example of this species. 
Macrostylocrinus granulosus (Hatr). 
Plate XXII. Figs. 15a, b. 
1879. Macrostylocrinus striatus, var. granulosus — Hat; 28th Rep. N. Y. State Mus. Nat. Hist. (Mu- 
seum edit.), p. 129. 
1885. WM. striatus, var. granulosus — W. and Sv. ; Revision Palxocr., Part III. p. 102. 
A more slender species than the preceding. Dorsal cup obconical ; its 
sides nearly straight, spreading gradually and uniformly upwards; cross- 
section at the top of the costals decidedly pentangular; the basals and all 
plates following the rays marked by broad, rounded ridges. Another promi- 
nent ridge passes from the anus downward to the middle of the proximal 
anal plate, where it bifureates to adjoining radials. Narrower ridges connect 
the radials laterally, and form a well defined boundary line between the 
upper and lower portions of the dorsal cup. The general surface is covered 
by fine wrinkles and indistinct striw ; those following the radials and costals 
longitudinally arranged, the others meeting within the middle of the plates. 
Basals and radials smaller thaf in the preceding species ; the latter plates 
about as wide as long, subquadrangular, and but very little sloped at the 
upper corners. First costals less than two thirds the length of the radials, 
and considerably narrower; second costals shorter and narrower than the 
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