440 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
PELAGODISCUS Datt, nov. sect. 
Discinisca atlantica K1ne. 
Collected by the ‘‘ Challenger” expedition, at station 299, off Valparaiso, in 2160 
fathoms, mud, bottom temperature 34° F. U.S. 5S. ‘‘ Albatross,” station 4709, 
southwest of the Galapagos Islands, in 2035 fathoms, temperature 35°.3 F. 
The typical Discinisca has the distal ends of the brachia coiled, but in this 
widely distributed abyssal form the brachia form two simple loops with no spiral 
whatever. The lower valve is very thin and fragile; it is almost impossible to 
detach it from the animal, owing to the hourglass shape and great solidity of the 
peduncular muscles. It is smooth and without the concentric or radial sculpture 
found in the shallow-water species. It is also markedly smaller than the upper 
valve, and the closely adherent lower half of the mantle bears peripherally only 
short setae, the very long setae with prickly surfaces, characteristic of this species, 
are confined to the edge of the upper lobe of the mantle. The rather poorly 
preserved specimen upon which these observations were made was collected in 
the North Atlantic, off Martha’s Vineyard, by the ‘‘ Albatross.’”’ One young 
specimen was obtained from the Pacific in the “ ATNSisRS ” dredgings, on a 
manganese nodule, 
Craniidae. 
CRANIA ReEtz1vs. 
Crania patagonica Dat. 
Crania patagonica Dall, Proc. U. S. Nat. Mus., 1902, 24, p. 562; 1903, 26, p. 950, 
pl. 62, figs. 1, 3. 
U. 8. S. “ Albatross,” station 2783, west coast of Patagonia, in 122 fathoms, 
mud, bottom temperature 48° F. U.S. N. Mus. 96,913. 
The single upper valve upon which this species was founded is quite sufficient 
to distinguish it from any other. No other species of Crania has been described 
having the upper surface of the valve decorated with little sharp tubercles, which 
under the lens have the appearance of very short spines. 
In his report of the Belgica Antarctic expedition brachiopods (Anvers, Dec., 
1901) Joubin states that Cranta pourtalesit Dall has been reported from Cape 
Horn, and in fact I find the name cited without comment in the list of species 
from Cape Horn given by Fischer and Oehlert as collected by the Mission to 
Cape Horn. Whether a specimen too imperfect to afford material for study was 
provisionally referred to the West Indian Crania, or why no further remark was 
made about it, I am unable to say, but it may have been a specimen or fragment 
of the present species, as it seems improbable that C. powrtalesii should extend 
from the tropics to the Antarctic. It is quite evident from the excellent magnified 
figure given by Joubin that his Crania lecointei from south latitude 70° 23’, in 
