M. Koidzumi 
303 
permanent mouth, food being ingested through the general surface of the 
hind end of the body. A peculiar differentiation of the protoplasm surrounding 
the nucleus is present in the anterior region. It may assume the form of a 
hemispherical bowl (corbule) and a columnar mass; or it may be distributed 
diffusely, or merely form a layer round the nucleus. The rest of the body not 
distinctly ridged; naked or flagellated. Flagella arranged in longitudinal rows 
at anterior end of the body, and sometimes restricted to this region. Some¬ 
times, however, the rows extend over the greater part of the body, and in 
this case they are arranged in spiral lines (laeotropic) in the posterior region. 
Multiplication by simple longitudinal fission, the nucleus dividing by mitosis. 
No cysts or sexual stages known. 
Genus I. Triclionympha Leidy, 1877. 
Anterior part of the body distinguishable into two parts, the nipple and 
the bell. The nipple consists of an axial core with two layers surrounding it. 
The wall of the bell also consists of two similar layers. A corbule and a 
columnar mass of peculiar protoplasm are present, the nucleus being kept at 
the bottom of the former and at the base of the latter. Flagella arising in 
longitudinal rows from nipple and bell. The hinder part of the body, posterior 
to the bell, free from flagella 1 . Type species T. agilis Leidy, 1877. (In Leuco- 
termes ( Reticulitermes) jlavipes, N. America.) 
Genus II. Pseudotrichonympha Grassi, 1911. 
Anterior part of the body distinguishable into two parts, as in Tricho- 
nympha. The axial core consists of a column with a ball at the tip, and is 
surrounded by a single layer of ectoplasm. The wall of the bell consists of 
two layers. The nucleus lies freely in the endoplasm. Body posterior to bell 
furnished with spiral rows (laeotropic) of short flagella, excepting a small 
area at the posterior extremity. Type species Ps. hertwigi (Hartmann) Grassi, 
1911. (In Coptotermes hartmanni, Brazil.) 
(2) Family Teratonymjphidae (fam. nov.). 
Large forms. Anterior end of the body highly differentiated as in the 
Trichonymphidae, but more complex in structure. Body regularly ridged 
transversely, so that it appears metamerically segmented. Each ridge pro¬ 
vided with a single rcw of flagella. No visible mouth. The single vesicular 
nucleus is enclosed in a nuclear sac, fixed to the body wall and base of the 
head, and lies in the first apparent segment of the body. Multiplication by 
simple longitudinal division, with mitosis of nucleus. No cysts or sexual 
development known. Genus Teratonympha (gen. nov.) with characters of 
family. Type species T. mirabilis mihi. (In Leucotermes (Reticulitermes) 
speratus, Japan.) 
1 If the description of Kofoid and Swezy (1919) is right, I do not take their Triclionympha 
campanula to belong to this genus. Leidyopsis described by them appears to be closely similar 
to (probably synonymous with) Gymnonympha of Dobell, and I think both belong to this family. 
