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 Berlin, Germany. 



CALLIASTERELLID^E, new family. 



Calliasteridse SCHONDORF, Jahrb. nassaulsch. 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 supramarginalia. No interbrachial areas. Ambulacrals oppo- 

 site. 



Contains : 



CalliastereUa, new name. 



Genus CALLIASTERELLA, new name. 

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



Calliaster mirus TRAUTSCHOLD (not Calliaster Gray 1840, Echinoderma), Nouv. 



Me"m. Soc. imp. Nat. Moscou, vol. 14, 1879, p. 108, pi. 13, figs. 3a-3ft, 4. 



SCHONDORF, Palaeontographica, vol. 56, 1909, p. 327, pi. 23, figs. 2-5; pi. 24, 



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

 CalliastereUa SCHUCHERT, Fossilium Catalogus, Animalia, pt. 3, April, 1914, 



p. 14- 



A cryptozonian asterid with the general expression of the ophiurid 

 Ony chaster. 



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 hi the next ring to the ten basal inframarginal 

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

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

 with large rounded openings between the adjoining spicular ends. 

 Between each pair of basal inframarginals are inserted single elon- 

 gate interradial disk plates. 



Madreporite unknown. 



The rays abactinally have a medial column of transverse radialia, 

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

 marginals. These ossicles are of peculiar construction, enabling 

 the rays to flex about as in Onychaster. 



