MORPHOLOGY AND TAXONOMY OF THE INFUSORIA 501 



Family 4. Plagiopylidae Schewiakoff 1896. 



3. Free-living forms Genus Plagiopyla Stein 



Parasitic in gut of sea-urchin Genus Lechriopyla Lynch 



Family 5. Clathrostomidae Kahl 1926. 

 Only one genus — Clathrostoma Penard 

 Family 6. Colpodidae Poche 1913; em. Kahl, 

 * 192G 



1. Mouth a funnel-shaped pit 2 



Mouth a long tube, or a narrow diagonal 



pit 4 



2. Mouth funnel does not include almost half 



of anterior end 3 



Funnel deeply sunk; forms wide opening, 

 partly covered by cilia Genus Bresslaua Kahl 



3. Mouth opens on the broad side; the right 



edge is continued horse-shoe-shape 

 around posterior end of mouth and half 

 of left edge; group of posteriorly directed 

 cilia from anterior part of left edge 



( tenus Bryophrya Kahl 

 Mouth opens more towards the left; its left 

 edge bears a cross-striped ciliated area, 

 but no membrane Genus Colpoda 0. F. M. 



4. Mouth a long, bent, ciliated tube; form like 



Colpoda Genus Tillina Gruber 



Mouth a flat, diagonal pit; marine form, 



like Chilodonella ( lenus Woodruffia Kahl 



Family 7. Parameciidae Kent 1881 : em. Kahl 1931. 



Only one genus — Paramecium Hill (Fig. 204) 

 Family 8. Marynidae Poche 1913. 



1 . Peristome furrow describes a complete ring- 

 about anterior pole; colonial in branch- 

 ing gelatinous tubes ( renus Maryna < rruber 



Peristome furrow confined to ventral sur- 

 face; in simple cups Genus Mycterothrix Lauterborn 



Family 9. Trichopelmidae Kahl 1926. 



1 . Oral funnel supported by delicate rodlets, 



opening on anterior third or fourth of 



body 2 



Oral funnel without rodlets ; mouth opens in 

 middle or near posterior end .'! 



2. Peristome extends over into right lateral 



surface; small membrane in gullet. Genus Pseudomicrothorax 



Mermod 

 Mouth area distinctly set off; gullet open- 

 ing directed to left; 2 or 3 cirri or mem- 

 branelle-like structures Genus Trichopelma Levander 



3. Mouth opens to left in body center, in 



membrane-bearing groove Genus Drepanomonas Fresenius 



Mouth area in little pit near posterior end 



of left edge Genus Microthorax Engelmann 



Family 10. Conchophthiriidae Reichenow-Doflein 1920. 



1. Dorsal lobe overhanging mouth. . . .Genus Entorhipidium Lynch 

 No dorsal lobe 2 



