VITRINA. 151 



Y. PELAGICA, Morelet. PI. 32, figs. 6-8. 



Rather solid, shining, pellucid, smooth, greenish yellow ; 

 spire convex, suture linear, marginate ; whorls 3, rapidly 

 increasing ; aperture oblique!}" oval, the margin slightly 

 thickened, the extremities approximating, joined by a thin 

 callus, the columellar margin narrowly expanded and subre- 

 flexed, with a very minute fosset or chink between it and the 

 base. Diam. 8, alt. 4 mill. 



Sta. Maria, Azores. 

 Y. LAXATA, Morelet. PI. 32, figs. 9-11. 



Oblong-ovate, depressed, very thin, subrugulose, shining, 

 hyaline, greenish yellow ; suture rugulosely margined ; whorls 

 3J, rapidly increasing, the last large, dilated, elongated trans- 

 versely ; aperture obliquely transversely oval, superior margin 

 slightly arcuate, the inferior not membranaceous, a little 

 thickened. Diam. 12, alt. 6 mill. 



Sta. Maria and S. Miguel, Azores. 



Yar. /?, more globose and more solid. 



Y. FASCIOLATA, Fer. PL 32, figs. 12, 13. 



Depressed, transversely oblong, thin, yellowish green, with 

 two red revolving lines, and two more on the base of the body- 

 whorl ; whorls 3, rapidly enlarging; aperture lunately oval. 



Diam. 16 mill. 



Teneriffe ? 



Evident^ does not belong to this fauna, modern naturalists 

 having failed to obtain it in either of the groups. 



III. West African Species. 



Y. WELWITSCHII, Morelet. PI. 33, figs. 14-16. 



Imperforate, subdepressed and plicately striate above, not 

 shining, yellowish brown, smooth, shining and olivaceous below ; 

 suture distinct but not margined; whorls 4, the last large and 

 compressed at the periphery ; aperture somewhat oblique, the lip 

 membranaceous-margined. Diam. 33, alt. 20 mill. 



Angola, W. Africa. 



V. Angasi, H. Adams (fig. 16) is a synonym ; it was nominally 

 published in the same year, but Morelet has shown conclusively 

 that his was the earlier publication. 



