162 BULLETIN 100, UNITED STATES NATIONAL MUSEUM 
Remarks.—This new species was found at one station only and 
must therefore be limited in its distribution, but the number of speci- 
mens obtained indicates that it can breed fairly well in favorable 
localities. 
AMALLOTHRIX LOBATA (Sars) 
PLATE 20, FIGURE 278 
Scolecithricella lobata Sars, Bull. Inst. Océanogr. Monaco, No. 377, p. 9, 1920. 
Amallothrix lobata Sars, Rés. camp. sci, Albert de Monaco, No. 69, p. 184, pl. 51, 
figs. 8-13, 1925. 
Station 5120. First placed by Sars in the genus Scolecithricella 
but later transferred to the genus Amallothrix« when fully described 
and figured in the final Monaco report. It has not appeared in any 
other plankton list, and, inasmuch as all the Monaco specimens came 
from the temperate Atlantic, these A/batross specimens furnish the 
first Pacific record. From the scarcity of specimens it is evidently 
a rare species, though it is found in both oceans. 
AMALLOTHRIX OBTUSIFRONS (Sars) 
PLATE 4, FicgureEs 21, 22 
Amaliophora obtusifrons Sars, Bull. Mus. Océanogr. Monaco, No. 26, p. 22, 1905a. 
Amallothria obtusifrons Sars, Rés. camp. sci. Albert de Monaco, No. 69, p. 179, 
pl, 50, figs. 1-16, 1925. 
Stations 4664; 4665; 4668; 4679; 4707; 4715; 4717; 4719; 4721; 
4722; 4727; 4730; 5233. This species was first placed in the genus 
Amallophora but was transferred to Amallothrix im the final Monaco 
report. The fifth leg of a female is shown on plate 4, figure 22, the 
distinguishing characters being the narrowing of the end segment 
at its tip, the curved terminal spine, and the minute spine on the outer 
margin opposite the large inner spine. As indicated by the list of 
stations above, this species is fairly well distributed. It appears in 
the Carnegie as well as the Monaco planktons. 
AMALLOTHRIX PROPINQUA (Sars) 
PLATE 20, FIGURE 279 
Scolecithricella propinqua Sars, Bull. Inst. Océanogr. Monaco, No. 877, p. 9, 
1920. 
Amallothrig ‘propinqua Sars, Rés. camp. sci. Albert de Monaco, No. 69, p. 178, 
pl. 49, figs. 22-27, 1925. 
Stations 5185; 5223; 5231; 5233. Placed by Sars at first in the 
genus Scolecithricella and later transferred in the final Monaco record 
to the present genus. The species was founded upon a single female 
taken in a 4,800-meter haul off Lisbon, and no other specimen has 
