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 L. Jou.iseaumi, 

 with which it was dredged, but the crenulate margin showed this to be an error. 



Limopsis panamensis Dall. 



Limopsis panamensis Dall, Proc. U. S. Nat. Mu8., Mar., 1902, 24, p. 569 ; 1903, 26, 

 p. 951, pi. 62, fig. 8. 



U. S. S. "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 L. mabil- 

 liana, or the following species. 



Limopsis stimpsoni Dall, n. sp. 



Shell ovate, inequilateral, anterior end shorter, attenuated ; posterior convexly 

 arcuate, produced; periostracum light brown, formed much as in L. mabilUana ; 

 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. madilliana, but very different in profile. 



Limopsis juarezi Dall, n. sp. 



PlRt« 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 iiardly any apparent sculpture, uotwith- 



