Netv Species of A mast ra. 17 



Hawaii: Waikii station in the land of Waikaloa about 

 6.000 feet elevation (Judd). 



Holot3-pe and cotypes No. 41,965, paratypes No. 41,966, 

 Bishop Museum. 



This species does not seem to be closely related to any of the 

 other species from Hawaii. Its pointed apex and the striation of 

 the embryonic whorls place it in the melanosis series. A. senilis is 

 undoubtedly the closest relative of this species known at present. 

 Tae former is larger, wider and has a rather wide and open 

 umbilicus. 



The specimens of A. spiciila which have been examined vary 

 considerably in form from each other. They all agree, however, 

 in having a closed or nearly closed perforation, and the degree of 

 malleation is fairly constant. The sharp and pointed apex is by 

 far the easiest character by which we can recognize this species. 

 The first specimens were found by Mr. Judd, and it is probably 

 not very abundant as onh- nine examples have been examined. 



Immature specimens of about five whorls are either perforate 

 or imperforate. In perforate specimens the columella is straight 

 and narrow and furnished with a low oblique fold. In imperforate 

 specimens the columella is slightly twisted and is furnished with 

 a low oblique fold. Immature specimens are distinctly angled or 

 carinate at the periphery. 



A. viriosa, n. sp. 



PI. C. Fig. 6. 



The shell is openly perforate, ovately conical, thick ; the color 

 of the cuticle is brussels brown, the under-color of the last whorl 

 is pale olive-buff, the rest of the whorls being of a vinaceous-fawn. 

 The upper part of the spire is almost straightly conic ; the penul- 

 timate and last whorls are rather strongly convex, slightly should- 

 ered above. The embryonic whorls are nearly fiat, almost smooth, 

 much darker than the rest of the whorls; in young specimens, 

 under a strong lens, they are very minutely and almost regularly 

 striate. Later whorls are coarsely irregularly striate and in some 

 specimens the last whorl is more or less irregularly malleate. The 

 aperture is rather small for a shell of its size, somewhat contracted 

 above and without a distinct thickening along the outer lip. The 



O. p. B. p. B. M. Vol. Ill, No. 3.— 2. [235] 



