MTTRELLA. 



rect. I have specimens of the original lot before me ; they do 

 not differ from unifasciata. The very short description given 

 by Lamarck of his C. unifascialw leaves little doubt that it was 

 intended for this species : it is said to have come from the Isle of 

 France, and has never been identified positively. I include also 

 C. ebenum, Phil., an un figured species from Magellan's Straits. 



C. ELECTROIDES, Reeve. PI. 47, fig. 44. 



Shell ovate, smooth, rather thin ; reddish fulvous, articulated 

 with white next the sutures. Length, 13 mill. 



Bay of Guayaquil. 

 C. INFUMATA, Crosse. PL 47, fig. 45. 



Shell ovate-elongate, rather thick, smooth, not shining ; 

 chestnut-brown, with scarcely visible white maculations next 



the suture. Length, 12 mill. 



So. Australia. 



Section IV. Mitrella, Rifso 



Shell in it ri form, smooth, with moderate spire ; columella smooth 

 or with a few anterior rugosities ; outer lip smooth or crenulated 

 within. I unite with this group Astyris and Amycla (in part) of 

 II. and A. Adams. The principal species of the latter are true 

 Nasxse, and are described in vol. iv, 36, 37. 



C. IDALTNA, Duclos. PL 47, figs. 46, 47. 



Shell smooth, polished, yellowish or rosy white, apex pink, 

 with a row of opaque white spots on the periphery, sometimes 

 shaded, and occasionally reappearing at the sutures of the upper 



whorls. Length, 8 mill. 



St. Thomas, W. I. (Swift). 



Under a glass, the shell is sometimes covered with smooth, 

 rounded longitudinal ribs ; the outer lip appears to be smooth 

 within. C. yuUnrosa, Duclos (fig. 47), is a larger shell according 

 to the figure given, but does not otherwise differ from a faded 

 state of C. idalina. 



C. MOLECULINA, Duclos. PL 47, figs. 48, 49. 



Shell white, with an open network of chestnut, and darker 

 chestnut curved markings near the suture, defining a sutural 

 band ; sometimes the surface is covered with chocolate, except 



the sutural space and the defining markings. 



Habitat unknown. 



