MARINE PROTOZOA FROM WOODS HOLE. 
433 
Key to Infusoria. 
1. With cilia Subclass Oiliala. 3 
2. Without cilia (in adult state) tentacles Subclass Suctoria 
3. a. Without a specialized fringe of large cilia (ad. zone) -. Order Holotrichida 
b. With general covering of cilia + adoral zone Order Ileterotrichida 
c. With cilia on ventral side + adoral zone Order Hypotrichida 
d. With cilia in region of adoral zone, and about mouth only . Order Pcritrichida 
Key to families of the Holotrichida, 
A. Mouth closed except during food ingestion; no undulating membrane 1 
Mouth always open; with undulating membrane . , 2 
1. Gymnostomina. 
a. . Mouth terminal or subterminal. Food is swallowed and not introduced by currents Family Enchelinidx 
b. Mouth terminal or subterminal; body frequently drawn out into long process; mouth may have 
specialized framework Family Trachelinidse 
c. Mouth central or posterior; pharynx with supporting framework Family Chlamydodontidx 
2. Trichostomina. 
a. Mouth anterior or central; pharynx short or absent; peristomial depression faint or absent. . . Family Chiliferidx 
b. Mouth central; pharynx long, tubular; cilia in two broad zones Family Urocenlndx 
c. Mouth posterior; form asymmetrical; cilia dispersed or limited to oral region Family Microtlioracidx 
d. Mouth anterior or central. Peristomial depression clearly marked. (One genus, Pararruxcium.) Paramacidx 
e. Mouth at end of long peristome running along ventral side; body dorso-ventrally or laterally compressed; 
left edge of peristome with great, sail-like undulating membrane Family Plcuronemidx 
f. Mouth and pharynx distinct, posterior; cilia uniform. Parasites in ruminants Family Isotrichidx 
g. Mouth absent; body vermiform, cilia uniform. Usually parasites , Family Opalinidx 
Key to marine genera of Enchelinidx. 
Diagnostic characters: Form ellipsoid or ovoid; the mouth is invariably terminal and is usually round — more rarely 
slit-formed; it is closed except when food is taken. An oesophagus when present is a short, invariably non-ciliated tube 
which is usually surrounded by a more or less clearly defined buccal armature. The anus is usually terminal. Large 
food particles are swallowed, never introduced by currents. 
1. Body naked 
2. Body inclosed in a shell or coat 
3. a. Cilia uniform about the entire body, body symmetrical 
b. Cilia in the mouth region longer than the others; body symmetrical 
c. Bristles, or tentacles, in addition to cilia 
4. Mouth terminal; body ellipsoidal to ovoid 
5. a. Mouth terminal; body elongate, flexible, and elastic 
b. Mouth terminal; “neck” highly elastic; entire body flexible; conical “head” 
c. Mouth terminal; “neck” highly elastic; entire body flexible; “head” square. 
d. Mouth terminal; “ neck n highly elastic; no separate mouth-bearing portion . . 
6. a. Body asymmetrical; bristles in addition to cilia 
b. Body symmetrical; 4 small tentacles from mouth; cilia and cirri in girdles 
7. Shell composed of small sculptured pieces; cilia long, uniform 
3 
7 
4 
5 
6 
Genus Holophrya 
Genus Chxuia 
..Genus * Lacrymaria, p. 433 
.Genus * Trachelocerca, p. 435 
Genus Lagynus 
Genus Stephanopogon 
. .Genus * Mesodinium, p. 435 
Genus * Tiarina, p. 436 
Genus LACRYMARIA Ehr. ’30. 
(Ehrenberg, C. G., 1838; Perty ’52; Clapar&deA Lachmann ’58; Stein 59-83; Quennerstedt '65, ’67; Fromentel '74; 
Kent ’81; Gruber ’84; Gourret & Roeser ’86; Biitschli ’88; Schewiakoff ’89.) 
Body short to very long flask-shape; for the most part contractile, especially in the neck region. 
The posterior end is rounded or pointed. The main character is the mouth-bearing apex, which “ sets 
like a cork in the neck of the flask.” One or more circles of long cilia at the base of the mouth 
portion or upon it. The body is spirally striped. Contractile vacuole terminal, with sometimes one 
or two further forward. Macronucleus central, globular to elongate, sometimes double. Food mainly 
bacteria. Fresh and salt water. 
Lacrymaria lagenula Clap. & Lach. Fig. 28, a, b. 
Synonym: A. tenvicula Fromentel ’74. 
Body more or less flask-shape, two or three times as long as broad, with conical apex, which is 
slightly elastic and protrusible; surface obliquely striate, with well-defined lines, 14 to 16 in number; 
cilia uniform on the body, with a crown of longer ones at the base of the conical proboscis. The 
F. C. B. 1901—28 
