DALL: MOLLUSCA AND BRACHIOPODA. 392 
Sacco proposes to retain D’Orbigny’s name Pectunculina for those species 
with stronger seulpture and denticulate valve margins, while for those intermediate 
between these and the smooth-edged type of Z. aurita, Rovereto has proposed the 
name Cosmetopsis. These mutations of sculpture are too fecble, and in one case 
too characteristic of different ages in the same individual, in my opinion, to be 
worthy of names. 
Felicia is apparently founded on a misconception. A large number of specimens 
were dredged by the “ Albatross,” and the series shows the impression of the tri- 
angular fossette to vary exceedingly in strength and when slightly eroded to be 
In some cases very easy to overlook. Its supposed absence, in Felicia as claimed, 
1s thus easily accounted for. 
There is, however, one good subdivision of the genus, as follows : 
EMPLECONIA Darr, sect. nov. 
Valves with their upper posterior margins beyond the hinge line, deeply in- 
folded, forming a deep narrow pit between the valves when closed. 
Type, Limopsis vaginatus Dall, Proc, U. S. Nat. Mus., 1891, 14, p. 190; 1895, 
17, p. 713, plate 25, figures 3, 6, 7. Bering Sea and North Pacific Ocean. 
LIMOPSIS s. s. 
(A. WITH ENTIRE MARGINS.) 
Limopsis zonalis Darr, n. sp. 
Plate 7, figures 6, 9. 
Shell large for the genus, compressed, oblique, ovate, whitish, clothed with a 
dense elongate villous periostracum of a dark brown color with narrow concentric 
zones which are nearly black; beaks narrow, sharp, prominent, vertically in- 
Curved over a short lozenge-shaped ligament centrally situated in a rather short, 
narrow, flat amphidetic area; beaks nearly smooth, the greater part of the disk 
Covered with small, low, slightly irregular, closely adjacent ridges, bearing fringes 
of Periostracum, crossed by very faint radial incised lines, with rather wide inter- 
Spaces, from which, over the lines project long hair-like processes in thick rows, 
extending beyond the margins of the shell; interior polished white with broad, 
flat, entire margin; hinge line with eight anterior and five or six posterior, 
radially arranged smooth teeth, the two series separated by a short gap; anterior 
3 ductor scar small, deep, adjacent to the hinge plate ; posterior scar four or five 
times as large and distant from the hinge plate. Alt. 25; lat. of shell, 97; of 
mge area, 11.5; max. diam. 10 mm. 
CS. Se ** Albatross,” station 3356, Gulf of Panama, in 546 fathoms, mud, bot- 
tom temperature 40°.1 F. U. S. N. Mús. 122,878 (type). Other specimens were 
Obtained from stations 3357 and 3358, in 782 and 555. fathoms, green sand, 
