552 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
Shell purplish, with the callosities of the aperture white, and an 
adherent periostracuni of oliv^e, more or less streaked with brown, 
sometimes with black stains. This species differs from the smaller 
and more slender A. idand!cus Gmelin, with which it has sometimes 
been confused, by its color, the persistency of its periostracuni, and 
its distribution. A. islandicus is not known from the Alaska region 
or the adjacent Polar sea, it is white invariably and the periostracuni 
is caducous. It reaches a height of ii5 mm. , but A. purpurea attains 
nearly 5(> mm. 
CALLIOSTOMA VARIEGATUM Carpenter. 
Plate XXXIX, iig. 10. 
CaUioMoma variegatiim Carpentek, Proc. Acad. Nat. Sci. Phib. for 1865, p. 61. 
Puget Sound and south to San Pedro Channel, California, in 30 to 60 
fathoms. U.S.N.M., 122567. 
This species was described from a .young shell dredged ])y Dr. 
Kennerlc3% and only a quarter of an inch (6 mm.) in height. It has long 
remained unique, but of late years the U. S. Fish Commission and 
the seaside laboratory of the University of California at San Pedro 
have obtained adult specimens which reach a height of 28 mm. and a 
width of 26 mm. The adolescent shell has the apical whorls rose color, 
the rest yellowish white, with the alternate spirals stronger, and 
articulated with madder brown l)oth on the spire and the base. As 
the shell gets fully adult the color becomes less lively and the articu- 
lation less distinct, so that the general tone of the shell appears to be 
of a yellowish pink with indications of the nacre shining through. 
CALLIOSTOMA TURBINUM Dall. 
Plate XXXIX, fig. 1. 
CaUiostoma turUnum. Dall, Proc. U. S. Nat. Mus., XVIII, 1895, p. 8. 
Off Point Conception, California, and eastward to San Diego in 100 
to 500 fathoms, U. S. Fish Commission. U.S.N.M., 122578. 
Shell small, turbinate and thin, the nacre shining with a peculiarly 
coppery luster, the apex white, the periphery painted with purple- 
bro"wn flammules and the spirals more or less articulated with the 
same color. The pillar is white. No attempt has been made in the 
figure to express the color markings. 
CALLIOSTOMA IRIDIUM Dall. 
Plate XXXIX, fig. 3. 
CaUiostoma iridium Dall, Proc. U. S. Nat. Mus., XVIII, 1895, p. 7. 
Off Panama, in 127 fathoms sand, bottom temperature 56° F., U. S. 
Fish Commission steamer Albatross. U.S.N.M., 122957«. 
