396 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.52. 



side of a minute resilifer. Length, 4.5; height, 3; diameter, 1 mm. 

 Cat. No. 214448, U.S.N.M. 



Station 2901, off Santa Rosa Island, California, in 48 fathoms, 

 muddy bottom. This species is related to L. commutata. 



LEDA LIOGONA, new species. 



Shell small, light yellowish, concentrically sculptured with prom- 

 inent elevated ridges with wider interspaces, except on the beaks 

 where the prodissoconch is relatively large and perfectly smooth, the 

 concentric sculpture commencmg abruptly; beaks low, and about 3 

 mm. from the anterior end; base slightly arcuate, dorsal slopes direct, 

 rostrum abruptly truncate; posterior dorsal area with two obscurely 

 elevated rays over which the concentric sculpture is higher, but it 

 becomes reduced to striation upon the strongly impressed escutcheon; 

 teeth much crowded, about twelve posterior and about the same num- 

 ber in front of the minute subumbonal resilifer. Length, 9; height, 

 5.3; diameter, 3.3 mm. Cat. No. 214089, U.S.N.M. 



Station 3604, Bermg Sea, in 1401 fathoms, mud. 



This species differs from the young of L. radiata Krause, by its more 

 conspicuous and regular sculpture and by the absence of radiating 

 threads. It probably attains a larger size. 



LEDA FOSSA Baird, 1863. 



Variety sculpta Dall. This form has regular concentric ripples on 

 the beaks, behmd a faint depressed ray near the anterior end and on 

 the keels on either side of the escutcheon. Cat. No. 107688, U.S.N.M. 



Station 2855, southeast of Alaska Peninsula, in 66 fathoms, mud. 



Variety vaginata Dall. This differs from the last in having the 

 concentric sculpture finer and less evident, and spread over the entire 

 shell. Cat. No. 226072, U.S.N.M. 



Station 4244, at Kasa-an Bay, Alaska, in 50 fathoms, mud. 



Variety curtvlosa DaU. Shell resembling variety sculpta but rela- 

 tively shorter than that or the typical form. Cat. No. 33771 , U.S.N.M. 



Unalaska Harbor in 60 fathoms on the Ridge. 



_ LEDA GOMPHOIDEA, new species. 



Shell elongate, inequilateral, smooth, polished, the rostrum ob- 

 liquely rounded-truncate, the anterior side rounded and shorter; 

 beaks small, but pustule like, 5 mm. from the anterior end, the prodis- 

 soconch distinct; teeth small and numerous, about 25 in front of and 

 35 behind the small oblique resilifer; posterior basal and doreal mar- 

 gins nearly straight, the escutcheon narrow, long, impressed, and 

 striated. Length, 17.5; height, 8; diameter, 4 mm. Cat. No. 

 212889, U.S.N.M. 



Station 3346, off Tillamook Bay, Oregon, in 786 fathoms. 



