542 TAGE RICOGSBERG 



detailed description of the genus; only a short diagnosis could be given. It is thus probable 

 that a number of the characters that are included in the description of the species given below 

 are characters of the genus as well. 



For the scope of this genvis and the contrast between (1. W. Mulleh's and my ideas 

 about it see above, p. 441 under the remark on the family Asteropidae. 



Type species: Cyclasterope Hendersoni, G. S. BRADY, 1897. 



Cyclasterope fascigera G. S. Brady. 



Ci/clasteropc fascigera, G. S. Bradv, 1902 a, p. 181, pi. XXI, figs. 20—31. 

 Asterope „ G. W. Muller, 1912, p. 44. 



Description: — Cf. G. S. BRADY, loc. cit. 



Male: — 



Shell: — Length, 5,8 — 6 mm.; length : height about 1,75 : 1; length : breadth about 

 1,8 : 1. Seen from the side (tig. 1) it is rather elongated, sub-ovate, with the posterior 

 part somewhat larger than the anterior part and the greatest height just behind the middle. 

 The dorsal and ventral margins have about the same shape; they are moderately and somewhat 

 irregiilarly curved and somewhat flattened anteriorly. They pass without any corners into the 

 boldly and uniformly rounded anterior margin. The latter has about the same shape on both 

 the valves and is not unsymmetrical, as G. S. Brady has represented it in pi. XXI, fig. 20. The 

 rostral incisur is situated at about half the height of the shell; the ventral corner of the rostrum 

 is almost rectangular, not at all or very slightly rounded. The posterior margin of the shell 

 forms, somewhat dorsally of half the height of the shell, a rather sharply marked corner, which 

 forms an obtuse angle and is only weakly rounded; it is uncertain whether this is found on both 

 valves, as this part of the right valve was somewhat damaged in the only specimen that was at 

 my disposal. Both dorsally and ventrally of this corner the posterior margin of the shell is 

 almost straight; it is bounded from the ventral margin by a weak, broadly rounded, scarcely 

 perceptible corner or it passes evenly into it; its passage into the dorsal margin is marked by 

 a slight sinuation. ,,S e e n f r o m above the outline is elliptical, with broad, slightly rounded 

 or subtruncate extremities; lateral margins gently and evenly arcuate, greatest width situated 

 in the middle" (G. S. Brady, p. 181, pi. XXI, fig. 21). The surface of the shell 

 is almost quite smooth, with only small, rounded, shallow foveolae, chiefly situated on the 

 anterior part of the shell. There are scarcely any bristles. The wreath of hair round the posterior 

 part of the shell is dense; these hairs are comparatively long and coarse. Seen from within 

 (fig. 2): Right valve: The ventral hp of the incisur forms a heel-shaped part, which 

 projects rather decidedly and is cut off obliquely dorsally. The antero-ventral part of the 

 rostrum also projects like a heel. Somewhat inside and running about parallel to the anterior 

 part of the dorsal and the dorsal part of the anterior margin of the shell there is a dense 

 series of very small, rounded and strongly refractive formations resembling a string of pearls. 



