236 BULLETIN OF THE 



Ovulum antillarum Reeve, Conch. Icon. Ovula, fig. 64, 1865. 

 Ovula carolinensis Murch, Malak. Blatt., XXIV. p. 54, 1877. 

 Ovulum subrostratum Sowerby, P. Z. S. 1848, p. 136 ; Tlies. Conch., p. 477, pi. c. 



figs. 39, 40, 1848. 

 Ovulum arcuatum Reeve, Conch. Icon. Ovulum, fig. 58, 1865. 



Habitat. Dead at Station 2, in 805 fms. Living in 2-20 fms., dead in 

 12-100 fms., from the Antilles northward to within twenty miles of Cape 

 Hatteras, North Carolina. 



The adolescent shell is beautifully spirally wavy-striate ; in the adult the 

 stria) are near the ends only, or wholly absent. It varies from fine deep plum- 

 color or sulphur-yellow to white. The yellow ones are found on the yellow, 

 and the purple ones on the purple Gorgonias or sea-fans, respectively. The 

 larval shell has four whorls, while one or two more turns may be made by the 

 adolescent shell (about 3.5 mm. long) before the former is entirely hidden. 

 The apex of the nucleus is blunt and of a reddish color, while the surface of the 

 rest is paler and covered with sharp lirae, close set and parallel with the lines 

 of growth. The sutures are evident but not pronounced. The adolescent 

 shell, exclusive of that which is truly larval, is of a whitish color in the speci- 

 men examined, and has only fine spiral Cylichna-\ike striation. It has a dis- 

 tinct columella, sharply truncate in front, and a wide canal, while at the apex 

 the shell is wound obliquely back over the nucleus, hiding about one half of it, 

 and is produced in a short canal beyond the extreme tip. There appears to be 

 a little over a whorl and a half subsequent to the original larval shell, and it 

 would require just about one whorl more wholly to enclose it. The larval 

 shell would seem to have been about a millimeter long, or perhaps somewhat 

 less, before the adolescent part was begun. 



Simnia (Neosimnia) aureocincta n. s. 



This shell is the Antillean analogue of S. spelta (Linn.) Tryon, and is best 

 described by comparison with it. 



Its surface is almost entirely destitute of the fine spiral striations of S. spelta; 

 its base is much more arched, the canals at either end are broad, blunt, and re- 

 curved, instead of pointed and straight; the color is pure white with a golden 

 yellow band winding round the shell just behind the periphery, and a yellow 

 brown line bordering the outer edge of the callus on each side. S. spelta varies 

 from waxy white to purple, without bands or margination. On the base in the 

 present species the body is more symmetrically fusiform, the body callus more 

 diffused, the aperture narrower, especially in front, and the posterior fold 

 stronger and larger. The back of spelta from end to end forms a low nearly 

 uniform arch, in aureocincta the ends are abruptly turned up and heavily 

 thickened with callus. Max. Ion. of shell, 18.5; max. lat. of shell, 8.0 mm. 



Habitat. Living on Gorgonia, off Sombrero, in 70 fms. Also at U. S. Fish 

 Commission Station 2334, near Havana, Cuba, on white coral, in 67 fms. 



