562 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.xxiv. 
CRANIA PATAGONICA, new species. 
Upper valve rather depressed, white, rounded except at the posterior 
margin, which is subtruncate; vertex small, prominent, situated at the 
posterior third; surface concentricall}^ rather slightly rugose but not 
lamellose; covered somewhat sparsely with numerous radiating, short, 
minute tubercles or spines; interior of the valve minutely, profusely, 
conspicuousl}^ punctate, the muscular and genital impressions feeble, 
the valve feebly marginated; impressions of the divaricator muscles 
feeble; what appears to be a minute accessory impression occurs out- 
side of each divaricator impression close vto the margin; in the center, 
between the divaricators, is a small obscure prominence close to the 
margin; the impressions of the adductors in the valve studied are 
somewhat irregular, reniform, and small; between them but not in con- 
tact medially are the also irregular, smaller imprints of the dorsal 
adjusters; in front of these is an obscure trilobed iuipression, and in 
front and then still further forward are some very faint vascular mark- 
ings feebly lobulate or dentate near the margin. Lon. of valve 'i.5, 
lat. 8.5, alt. 2.0 mm. 
Dredged in 122 fathoms, mud, bottom temperature 48° F.,at station 
2783, on the west coast of Chilian Patagonia, in the Madre de Dios 
Archipelago, by the U. S. Fish Commission. U.S.N.M., 130516. 
The single valve which was obtained is undoubtedly new, since no 
spinose Crania has hitherto been known. It is also the first indica- 
tion of Crania in this region, the onl}^ Antarctic species hitherto 
reported being C. suessii Reeve, the localit}^ of which is probably 
Moreton Ba}', Australia, although it was erroneoush" referred to 
Sydney by its describer. 
In this connection the existence of a spinose TIeinithyris in Japan 
may be recalled, though in that form the spinules are more intimately 
associated with the lamellose incremental sculpture than in the present 
case. 
EXPLANATION OF PLATES. 
Plate XXVIL 
Fig. ]. Nanma [Macrochlamys?) diadema Dall, l^asal view; major diameter 18.0 
mm.; p. 499. 
2. The same, in profile. 
3. The same, from above. 
4. Vitrea raderi Dall, basal view, the margin of the aperture slightly defective; 
major diameter 4.0 mm. ; p. 500. 
5. The same, in profile. 
6. The same, from above. 
7. Punctum randolphii Dall, from l^elow; major diameter 1.4 mm.; j). 500. 
8. The same, in profile. 
9. The same, from above. 
10. Zonitoides {Pseudohyalina) pugetensis Dall, from below; major diameter 1.5 
mm. ; p. 500. 
