190 BULLETIN 88, UNITED STATES NATIONAL MUSEUM. 



Formation and locality. — ^The holotype is from the oldest Upper 

 Carboniferous (Moscovian) of Mjatschkowa, near Moscow. The 

 specimen is now in the Bergakademie at Berhn, Germany. 



CALLIASTERELLID^, new family. 



CaWtasfenrf^ ScHONDORP, Jahrb. nassauiscli. Ver. Naturk., Wiesbaden, vol. 63, 

 1910, p. 251. 



Cryptozonia with ophiurid expression; a small disk with primitive 

 plate arrangement and five long, very flexible rays, with radialia 

 and supramarginaha. No interbrachial areas. Ambulacrals oppo- 

 site. 



Contains : 



Calliasterella, new name. 



Genus CALLIASTERELLA, ne^Ar name. 

 Plate 31, fig. 3, text fig. 11. 



CalHaskr minis Trautschold (not Calliaster Gray 1840, Ecliinoderma), Nouv. 



Mem. Sec. imp. Nat. Moscou, vol. 14, 1879, p. 108, pi. 13, figs. 3a-3A, 4.— 



ScHONDORF, Palseontographica, vol. 56, 1909, p. 327, pi. 23, figs. 2-5; pi. 24, 



figs. 1-18; text fig. on p. 328. 

 Calliasterella Schuchert, Fossilium Catalogus, Animalia, pt. 3, April, 1914, 



p. 14. 



A cryptozonian asterid with the general expression of the ophiurid 

 Onychaster. 



Description. — Disk relatively small, primitive, with rather large, 

 decidedly spiculate ossicles. Rays five, long and slender, round 

 in section. R = about 120 mm., r = 30 to 35 mm., R = 4r. Width 

 of ray at mid-length about 15 mm. 



Abactinal disk plates in form and position as in figure 11. There 

 is a small central five-rayed plate with the rays in the position of the 

 five arms. Around the central plate is a first ring of five larger basal 

 radial plates. Then comes a second ring of ten plates, five of which 

 are the second basal radialia; the other five are interradial in posi- 

 tion and give rise in the next ring to the ten basal inframarginal 

 ossicles. The third ring has five radiaha and ten basal inframargi- 

 nals. All of the ossicles in the three rmgs are variously six-rayed, 

 with large rounded openings between the adjoinmg spicular ends. 

 Between each pair of basal inframarginals are inserted single elon- 

 gate interradial disk plates. 



Madreporite unknown. 



The rays abactinaUy have a medial column of transverse radiaha, 

 and alternating with these on either side are columns of supra- 

 marginals. These ossicles are of peculiar construction, enabliog 

 the rays to flex about as in Onychaster. 



