LORQUINIA 
trefnely long, slender setae, furnished with slender branching aciculae ; 
series of minor setae near the margin. 
Type Locality: Sta. 4263, Dundas Bay, Alaska ("Albatross"). 
M opalia phorminx new species 
Small, elongate, with straight side slopes. Surface finely granu- 
losa Head valve with ten major radiating series of coarse pointed 
pustules, one or two similar but smaller series interposed in alternation. 
Median valves with lateral areas bounded by rib-like diagonal and 
sutural series of coarse pustules, and with some 2-5 minor series of 
pustules interpolated between. Central areas on each side with 10-14 
sharp, flexuose, longitudinal ribs, the outer ribs more or less broken 
posteriorly, the breaks forming radial series of granules in front of 
the diagonal rib. Tail valve with mucro strongly posterior, little ele- 
vated ; caudal sinus strong. Sliit formula 8, 1-1, 1-1. Girdle narrow, 
armed above with a microscopic spinulation, and both a major sutural 
and several minor series of beard-like setae. Color brownish cream, 
with yellowish brown mottlings. 
Type Locality: Ofif Point Pinos, California (Dr. Heath). 
M opalia chacci new species 
Moderately small, oval, with distinctly arcuate side slopes. Head 
valve with ten clear-cut, heavy, pustulose ribs, their interstices heavily 
granulose. Median valves with strong diagonal and weaker sutural 
ribs, both pustulose, the lateral areas coarsely granulose between them ; 
central areas on each side with 18-20 clear-cut, slightly granulose, 
longitudinal ribs, generally straight, but on jugum becoming finer and 
converging in front, interstices latticed by a system of numerous very 
fine transverse riblets. Tail valve small, with depressed mucro and 
shallow posterior sinus. Color of shell dull greenish brown, more or 
less mottled with various tones of brown or green. Girdle narrow for 
a Mopalia, bearing a primary sutural series of short setae, spinose on 
the upper margin, and 2 or 3 gradually smaller series of similar setae 
outside of these. 
Type Locality: La Jolla, California (S. S. Berry). 
Placiphorella pacifica new species 
Shell obovate, depressed. Anterior valve with 12-14 low, radiating 
ribs. Central areas of median valves nearly smooth ; lateral areas 
raised, ornameted with 2 low, weakly nodulose ribs. Tail valve small, 
with subterminal mucro. Head valve with 16 slits, median valves with 
1-1 slits, tail valve slitless. Girdle narrow behind ; expanding into a 
broad lobe in front ; covered dorsally by minute, microscopic spinelets 
and occasional slender spinose setae and tufts of spines. 
Type Locality: Sta. 4245, 95-98 fathoms, Kasaan Bay, Alaska 
C'Albatross"). 
