Morse on Living Brachiopods. — SchucJicrt. 119 
"The two broad pallial sinuses, so characteristic of all the 
Lingulidac, start from the perivisceral cavity at its junction 
with the perigastric cavity. * * * * The two main sin- 
uses run to the anterior portion of the pallium, and, in Glot- 
tidia, make a graceful outward curve at the start and then a 
slight inward curve. The anterior terminations of these sin- 
uses are only one-third the distance apart which separates 
them at their origin. On the inner side of these sinuses there 
start short lacunae reaching nearh^ to the median line and 
slightly inclined anteriorly. On the outer side of the sinuses 
there spring from nine to eleven lacunae having the same an- 
terior inclination and reaching nearly to the base of the setae 
in the lateral margin of the pallium. * * * ^ 'pi-ig current 
passes outwardly along the inner side of the great pallial 
sinus, running into all the inner lacunae in turn, then 
reaching the anterior end of the sinus, it returns on the 
other side, running into each gill-bearing lacune in turn and 
coursing through each gill lappet. * * * :f< Another sinus 
turns directly backward from the opening of the main pallial 
sinus and follows along close to the lateral margin of the pal- 
lium sending a series of branching lacunae to the shallow 
posterior portions of the pallium. This I have indicated as 
the lateral pallial sinus. Beside the main pallial sinus and the 
lateral pallial, there is another which turns abruptly back from 
the main sinus opening, runs along on each side of the gourd- 
shaped outline of the perivisceral cavity, inclining slightly 
toward the median line, and disappears in a distinct round 
opening near the posterior lateral border of this outline. This 
I have designated the coelomic sinus. * * * * The pal- 
lium of L. lepidula shows marked dififerences from that of 
Glottidia in the disposition of the main pallial sinuses and of 
the smaller lacunae. In L. lepidula, the main sinuses run near- 
er the lateral margins of the pallium, and their terminations 
are wider apart than in Glottidia ; furthermore the sinus has 
a uniform outward curve. The lacunae, which run off to the 
right and left with such regularity in Glottidia, are irregular 
and branched. '■' * * * The blood pours out of this open- 
ing (apparently the one to the perivisceral cavity) in a vigor- 
ous current on the inner side, runs along the inner side of the 
great pallial sinus, coursing through all the lacunae succcs- 
