THE SMALLER SEA-SHELLS 173 



species has a pear-shaped shell, with several sharp, 

 frill-like varices. The sutures are deep, and the 

 few whorls of the spire are very distinct. The color 

 in small specimens is generally white, though often 

 the interior is somewhat brown. This shell reaches 

 a length of one inch. There are many other species 

 of this genus, most of them small, which will not be 

 described in this book. Anyone who wishes to inves- 

 tigate the matter will find them properly described 

 in \'olume XXIV of the "Proceedings of the United 

 States National Museum." That book should be 

 found in all large public libraries. Interesting arti- 

 cles on shells are to be found in very many of the 

 volumes of the same series. 



We now come to a somewhat puzzling genus of 

 shells, the Ocinebras. Most of them have small, 

 fairly strong shells, with moderate apertures and dis- 

 tinct canals, though the latter are sometimes closed. 

 By that term we mean that they are tube-like; they 

 are never closed at the lower end of the shell. 



Ocinebra interfossa^ Cpr., the Sculptured 

 Ocinebra, shown in Figure 162, has a small, 

 spindle-shaped shell, marked with spiral 

 grooves, sharp varices, and deep sutures. It 

 varies in color through shades of yellow. Fig. 152 

 gray, and brown. The picture gives an ex- 

 cellent idea of the shell, both as to size and shape. 

 The color is white within and dull gra}^ without. 

 The shell is quite rough and rasp-like, owing to the 

 distinct sculpturing. This species is liable to be 

 found all along the coast, where there are rocks or 

 cliffs. 



