24 OCINEBRA. 



by fine spiral grooves. The aperture is oval ; the canal 

 sometimes open and sometimes tubiform. While the 

 spiral lines are prominent, the transverse sculpturing 

 is faint. The color, as is indicated by the name, is 

 usually reddish yellow, but sometimes it is nearly 

 white. The length is one-half or three-fourths of an 

 inch. At low tide I have found living specimens 

 clinging to stones. 



Oci7iebra intei^fossa, Cpr., in-ter-fos'-sa, Fig. 5, is 



of about the same shape as the last species, though it 



is usually rather larger. It, too, has spiral 



grooves, but it also has sharp varices and deep 



sutures. It varies in color through shades of 



yellow, gray and brown. It is found near 



the places which the preceding species in- 



Fig. 5- habit. 



And now comes another species of this genus, 



Ocinebra circmntexta^ Stearns, cir-cum- 



tex^-ta. The shell is represented in Fig. 6. 



It is larger and heavier than the last, has a 



short spire, rather low varices, but very deep 



and distinct spiral grooves which give the 



outer lip a scolloped appearance. It is of a 



reddish color within, but externally it is 



Fig. 6. whitish, with brown spots. 



Ocinebra gracillima^ Stearns, gra-siF-li-ma, is a 



small, southern species, similar, in some respects, to 



Fig. 5, but smoother and darker colored than the shell 



of O. interfossa. 



