396 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 
not pilose but individualized and distant; beaks small, prominent, with a very 
minute area and small resiliary groove, five anterior and six posterior hinge- 
teeth, the series hardly separated, the anterior teeth longer than the posterior; 
shell greenish white; base arcuate, inner margins strongly crenulate. Length, 6.0; 
alt. 5.5; diam. 3.0 mm. 
U. S. S. “Albatross,” station 2780, off the southern coast of Chile, in 369 
fathoms, mud, bottom temperature 47° F. U.S. N. Mus. 110,703. 
The single specimen was at first suspected to be the young of LZ. jousseaumt, 
with which it was dredged, but the crenulate margin showed this to be an error. 
Limopsis panamensis Datt. 
Limopsis panamensis Dall, Proc. U. 8. Nat. Mus., Mar., 1902, 24, p. 559; 1903, 26, 
p. 951, pl. 62, fig. 8. 
U. 8. 8S. “Albatross,” station 3393, Gulf of Panama, in 1020 fathoms, mud, 
bottom temperature 36°.8. U.S. N. Mus. 109,028. 
The characteristics of this little species are its rotundity, its blackish olive peri- 
ostracum, and crenulate margins. It is of an entirely different shape from Z. madit- 
liana, or the following species. 
Limopsis stimpsoni Datz, n. sp. 
Shell ovate, inequilateral, anterior end shorter, attenuated ; posterior convexly 
arcuate, produced; periostracum light brown, formed much as in LZ. mabilliana ; 
area narrow, the resilium minute; interior greenish white, radiately grooved 
toward the margin, which is crenulate; teeth small and feeble, five anterior and 
four posterior, separated by an edentulous space; the muscular scars discrepant 
as usual. Length of whole shell, 6.5; of posterior part, 4.0; alt. 6.2; diam. 
3.5 mm. 
U.S. S. “Albatross,” station 3392, Gulf of Panama, in 1270 fathoms, hard 
bottom, temperature, 36°.4 F. U.S. N. Mus. 122,881. Also at station 3393, 
in 1020 fathoms, mud, temperature 36°.8. 
I have named this species in honor of the late Doctor William Stimpson. It is 
nearest L. mabilliana, but very different in profile. 
Limopsis juarezi Datt, n. sp. 
Plate 18, figure 8. 
Shell small, solid, white, moderately compressed, with a dense fringed brown 
periostracum disposed in concentric lines, showing wide interspaces, in the young, 
with radial lines of fringe more conspicuous later; beaks small, pointed, prom- 
inent for the size of the shell; area narrow, the black ligament short and central 
below the beaks ; surface polished, with hardly any apparent sculpture, notwith- 
