560 rnOCEEDINGS of the national museum. vol. XXIV. 
and three (or four) anterior teeth bifid at their summits; basal margin 
of the valves and part of the anterior and posterior marg-ins denticulate, 
the upper portions plain. Lon. O.O; alt. 6.0; diam. 3.0 nun. 
Dredged in Panama Bay, at station 3393, in 1,020 fathoms, mud; 
bottom temperature 36". 8 F. U. S. N. M. , 109028. 
This little shell is quite similar to L. minuta., but is constantly 
smaller, of a different color, and with the pelage much blacker and in 
closer-set lines; the form of the valves when compared withZ. inimita 
of the same size is more quadrate, the denticulation of the inner mar- 
gin less extended, and the valves are more delicate. 
VENUS KENNICOTTII Dall. 
Plate XL, fig. 7. 
Mercrnariii kennicoUii Dall, Am. Journ. ('oneli., VII, Pt. 2, 1871, p. 147, pi. xvi, 
fig. 1. 
Neah Bay, State of Washington (Swan), and at Little River, Men- 
docino County, California (Harford). U.S.N.M., 7601T. 
Shell of a yellowish white with some ferruginous stains externally. 
The original type specimen obtained from the Indians at Neah Bay 
and a young valve obtained by Harford are all the specimens known 
of this rare and interesting species. It belongs to the typical Venus 
of Lamarck (1799), which was named 3{ercenaria by Schumacher. 
PANOPEA GLOBOSA Dall. 
Plate XL, fig. 1. 
Panopca (generosa var. ?) glohosa Dall, Trann. Wagner Free Inst. Sci., Ill, June, 
1898, p. 831. 
Valves were collected on the beaches at the head of the Crulf of Cali- 
fornia by Dr. Edward Palmer. U.S.N.M., 74881. 
The shell is of a yellowish white color, shorter, thinner, iuid more 
globose than P. generom and probably distinct. It reaches 160 nun. 
in extreme length. 
PANOMYA AMPLA Dall. 
Plate XL, figs. 3, 4. 
Panomya ampla Dall, Trans. Wagner Free Inst. Sci., Ill, .Tune, 1898, p. 833. 
Panopcea norvegica Middendorff (part) Malak. Rossica, III, 1849, p. 78, pi. xx, 
fig. 11; not of Spengler. 
Recent in the Aleutian region. Gulf of Alaska, and Okhotsk Sea 
in shallow water, and fossil in the Pleistocene of the same region. 
U.S.N.M., 161221. 
The shell is chalky white with a lilack dehiscent tarry periostracum, 
which is rarely preserved even 'in the living animal, which the valves 
only partially cover. v 
