mouth reaches from the anterior extremity to a short distance from
the end, and usually approaches the left edge. An anus is present
near the posterior end of the dorsal swelling. Trichocysts are
numerous on the ventral surface, and often on the dorsal surface,
where they are inclosed in minute papilla-like swellings.
Cilia-distribution controverted. Maupas and Bütschli hold that
ventral surface alone is ciliated; others (Kent and Dujardin) that
cilia are uniformly distributed. The entire body, dorsal and ventral
surfaces alike, are uniformly striated. The contractile vacuole lies
posteriorly, on the right side and in the dorsal swelling. In the
fresh-water form _L. meleagris_, it is connected with a long canal
whose swellings are frequently taken for additional contractile
vesicles (Bütschli); in the marine form described below the canal is
not developed and a series of vacuoles takes its place; these are
all contractile. The macronucleus may be single, double, quadruple,
band-formed, or rosette-formed. Movement is steadily progressive and
peculiarly gliding. Fresh and salt water.


Loxophyllum setigerum Quenn. '67.

Synonyms: _Litosolenus armatus_ Stokes '93; _Litosolenus verrucosa_
Stokes '93.

The body is flattened, irregular in outline, obtusely pointed
anteriorly, the point being turned to the right; rounded posteriorly.
The left edge is nearly straight, the right considerably arched with
a few setæ on the posterior half. Contractile vacuoles are numerous,
dorsal in position and on the right side. The macronueleus is beaded,
the several spheres connected.