434 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
body cilia are not thickly placed except around the proboscis. The endoplasm is thickly packed with 
large granules (food particles) in the anterior half and with finely granular particles in the posterior 
half. The elongate macronucleus lies a little above the center among the larger granules; the con- 
tractile vacuole is double, one on each side of the median line and at the posterior end of the body 
among the finer granules. The anus is posterior. Length 90// to 160/<; greatest width assumed 65#. 
When fully expanded the posterior end assumes a curious polyhedral form. (Fig. 28 b.) 
This form differs slightly from others of the same species as described by different observers, the 
most striking difference being the presence of two contractile vacuoles in place of the usual one. 
These are very slow to fill and grow to a large size before diastole. The membrane is very tough 
and retains its form easily under pressure of the cover glass. Another characteristic feature is the 
flattening of the surfaces between the stride. Decaying algre. 
a 
Fig. 28 . — Lacrymaria lagenula. 
Lacrymaria coronata Cl. & Lach. ’58. Fig. 29. _ 
Synonyms: L. lagenula Cohn ’66; Mobius ’88; L. cohnii? Kent ’81; L. versalilis Quen. ’67. 
Form flask-like and similar to L. lagenula, contractile but tough. The contractile vacuole is ter- 
minal, the proboscis is short, slightly raised and separated from the body by a deep cleft; the buccal 
cilia are inserted part way up on the proboscis. Form changeable, from short, sac-like to elongate 
and vermiform. Length 85/e 
This species is not very different from L. lagenula, but I noted that in addition to the elongate 
nucleus, the body stripe are much more apparent here and seem to sink into the cuticle, giving the 
periphery, especially at the collar region, a curious crenulated effect. The endoplasm is very densely 
granular and colored a blue-green, probably from food particles. The number of strige is much larger 
than in the preceding species. The membrane is very tough and retains the shape of the body, even 
with the full pressure of the cover glass. - Micronucleus and trichocysts were not observed. 
