New Species of Aviastra. 5 



var. r. armillata, u. var. 

 PI. A. Fig. 8. 



The shell is somewhat similar to A. ricei with the following 

 differences; the fourth and fifth whorls are slightly swollen, and the 

 surface is more coarsely but not as closely sculptured with growth - 

 wrinkles. The periphery is distinctly carinated on the last whorl; 

 the carina is margined along its upper edge by a deep narrow 

 sinus. The lower half of the last whorl descends rather rapidly, 

 with the carina appearing slightly above the suture. The outer 

 margin of the aperture is distinctly modified by the carina. The 

 upper portion being flattened, the lower evenly arched. The colu- 

 mellar fold is weak, thread-like, very oblique and deeply situated. 

 Length 22.7, diam. i2.i,apert. io.omm.;6^ whls. (Holotype) 

 " 24.6, " 12.0, " 10. o " 7 " 



Kauai: Milolii (A. F. Judd). 



Holotype and cotype No. 41,994, Bishop Museum. 



This variety is represented in the collection of the Bishop 

 Museum by two dead specimens. It is not known whether they 

 were from a Pleistocene deposit or simply old surface shells. The 

 main interest attached to these specimens is the extreme develop- 

 ment of the peripheral carina, so that the external margin of the 

 aperture is modified to a greater degree than in anj' of the speci- 

 mens of the typical form. 



Subgenus Cyclamastra. 

 'Umbilicata Series.) 



A. juddii, n. sp. 



PI. B. Fig. 5. 



The shell is perforate, dextral, conic, thin, nearly smooth, 

 irregularly sculptured by distant blunt growth-wrinkles, in its 

 fossil state of a dirt} 7 whitish color. Spire conic, with nearly 

 straight outlines. Embryonic whorls worn, nearly smooth, con- 

 vex; the following whorls slightly convex, the last large, convex, 



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