304 THE CRINOIDEA CAMERATA OF NORTH AMERICA. 
Melocrinus equalis 8. A. Mittrer. 
1892. Adv. Sheets 18th Rep. Geol. Surv. Indiana, p. 48, Plate 5, Figs. 11 and 12. 
A moderately small species. Dorsal cup obpyramidal, decidedly pent- 
angular at the arm bases, deeply sunken interradially. All plates of the 
calyx heavy and tumid; those of the dorsal cup covered with short ridges 
at their margins, one to each side, the median portions of the plates 
smooth. Suture lines well marked. The radial appendages directed almost 
horizontally. 
Basals nearly equal, longer than wide, the sides very little expanding. 
Radials as long as the basals, a little wider than long. First costals hexa- 
gonal, almost as large as the radials; the second smaller and irregularly 
axillary, giving off at the shorter side an armlet, and at the longer the next 
order of brachials. Rays free above the costals, and evidently composed of 
a single row of plates, with arms given off at alternate sides. Interradial 
areas probably alike; the first interbrachial nearly as large as the adjoining 
costal, followed by two and three smaller plates, of which the latter occupy 
the arm regions. Plates of the tegmen very large, composed of only two 
rings, the upper supporting a massive anal tube, composed of tumid or nodose 
plates. 
Horizon and Locality. — Niagara group, St. Paul, Ind. 
Remarks. — This species resembles I. parvus in having simple free rays, 
but differs from it distinctly in the form of the calyx, the greater convexity 
of the plates, in having a much stronger anal tube, and the rays directed 
horizontally. 
Our description was made after Miller, and from fragmentary specimens in 
our collection. 
II. DOLATOCRINITES. 
SYMMETRY OF THE DORSAL CUP UNDISTURBED BY ANAL PLATES. 
TECHNOCRINUS Hatt. 
1859. Hatz; Paleont. New York, Vol. III., p. 139. 
1879. Zivre.; Handb. der Paleont., Vol. I., p. 372. 
1881. W. and Sp.; Revision Paleoer., Part II., p..116 (Proceed. Acad. Nat. Sci. Phila., p. 290). 
1889. S A. Minter; N. Amer. Geol. and Paleont., p. 286. 
Calyx large; symmetry perfectly pentahedral up to the arm_ bases, 
except a slight irregularity in the basal cup. Basals four, somewhat un- 
