Corculum of Pacific and Indian Oceans— Bartsch 
lose spiral cords separated by spaces as wide 
as the cords bearing fine threads. Slender, 
closely spaced, incremental threads cross the 
radiating sculpture. The posterior surface 
has the heart-shaped escutcheon which is 
bordered by three low, broad, strongly nodu¬ 
lose ridges which extend over the elevated 
part of the shell. The concave part is marked 
by low flat cords separated by slight depres¬ 
sions, which grow wider from within out¬ 
ward. Wavy incremental lines render the 
cords feebly nodulose. The outer margin of 
the shell is strongly denticulated. The color 
of the specimens before me is white anteri¬ 
orly, with a water-silk effect posteriorly. 
The type, U.S.N.M. 543559 (Franco 1 h), comes 
from Cebu. It measures: height, 36.1 mm.; length, 
18 mm.; diameter, 29.9 mm. 
U.S.N.M. 152449 contains 2 specimens from 
Yokohama, Japan. US.N.M. 127623 contains 1 
from Okinawa Island. U.S.N.M. 74469 contains 
a young specimen referable here, obtained by the 
U. 8. Exploring Expedition; it bears the locality 
"East Indies.” Another young specimen, U.S.N.M. 
128487, has no locality data. 
Corculum humanum Roding 
(Plate 2, Figure 4) 
1782. Car din m humanum Chemnitz, Conch. Cab., 
vol. 6, pp. 153-154, pi. 14, figs. 145-146 (non¬ 
binomial). 
1782. Car dm m roseum Chemnitz, Conch. Cab., 
vol. 6, pp. 154-155, pi. 14, figs. 147-148. 
1798. Corculum humanum Roding, Museum Bob 
tenianum, p. 189. 
1819. Cardium junoniae Lamarck, Anim. s. Vert., 
vol. 6, p. 17. 
Roding based his name upon Cardium 
humanum Chemnitz. Chemnitz, being a non- 
binomialist, has no status in nomenclature; 
the species therefore dates from Roding. 
Chemnitz states that his specimen came from 
the Nicobar Islands. He also says that it is 
present in the Greater and Lesser Moluccas. 
Lamarck included C. humanum in his 
Cardium junoniae, in which he also placed 
Cardium roseum Chemnitz; I agree with 
225 
him. His C. junoniae therefore is a pure 
and simple synonym of C. humanum. 
In this species the shells attain a large 
size. The margin is not spinose or denticu¬ 
late. The anterior side is convex and the 
posterior is dished with the margin bent in¬ 
ward (not outward as in C. aselae ). 
Shell large, white, yellowish, unicolor or 
variously spotted or streaked with bright red 
or suffused or washed with paler shades of 
red, yellow, or orange. The anterior side is 
well elevated and marked by strong, rather 
broad nodulose radiating cords between and 
upon which moderately strong parallel 
threads are present. The strong cords widen 
and weaken gradually edgeward. The incre¬ 
mental sculpture consists of very regular, 
somewhat flattened threads which are sepa¬ 
rated by spaces almost as wide as the threads. 
The posterior side is deeply concavely dished 
for the outer two thirds of its surface. The 
convex area adjoining the escutcheon bears 
4 spinose cords; between these and the outer 
edge low flattened cords are present, which 
gradually grow wider from within outward. 
Fine threads and incremental lines reticulate 
the entire surface. 
The specimen figured, U.S.N.M. 543560 
(Franco 2), measures: height, 43 mm.; length, 18 
mm.; diameter, 38.9 mm. 
In addition, I have seen the following speci¬ 
mens referable here: 
U.S.N.M. 168710, 2 specimens from the Indian 
Ocean. 
U.S.N.M. 488017, 1 specimen from the U. S. Ex¬ 
ploring Expedition with Pacific islands as 
locality. 
U.S.N.M. 17466, 1 specimen from the East Indies. 
U.S.N.M, 168709, 2 specimens from the China 
Seas. 
U.S.N.M. 543561 (Franco 3 g), 1 specimen from 
Cebu. 
U.S.N.M. 543562 (Franco 3 h), 1 specimen from 
Cebu. 
U.S.N.M. 543563 (Franco 3/), 1 specimen from 
Cebu. 
U.S.N.M. 543564 (Franco 3k), 1 specimen from 
Cebu. 
