M. Koidzumi 
245 
VI. Spirotrichonympha Grassi. 
Body conical and rather small. Flagellar bands fewer, distributed over 
almost the whole of the body. The bands are peculiar in their disposition, 
being situated somewhat deeply in the protoplasm. One species: 
S. leidyi sp. nov. (in Coptoterm.es formosanus). 
VII. Ilolomastigotes Grassi. 
Body small and spindle-shaped, its surface spirally ridged; flagella arising 
in the grooves behind the ridges. One species: 
H. elongatum Grassi (?) (in Leucotermes speratus and L. flaviceps). 
(2) Pyrsonympha series. 
The body large or small, and club-shaped, fusiform, or piriform. An axial 
filament, fixed anteriorly, runs down the body. Four or eight slender cords 
start at the tip of the filament and run spirally backwards, fixed on the body 
wall, to the posterior extremity, where they emerge as free flagella. 
A single genus, Pyrsonympha, divided into two subgenera, Pyrsonympha 
and Dinenympha. A synopsis of the subgenera and the species will be given 
at the beginning of the description of these forms (p. 281). 
(1) Trichonympha Series. 
I. Trichonympha. 
This is one of the three oldest genera established in 1877 by Leidy for 
the American species. Under this genus six species have hitherto been de¬ 
scribed, viz. T. agilis, T. leidyi, T. minor, T. magna, T. hertwigi, and T. cam¬ 
panula. T. agilis is the species described by Leidy (1877 and 1881) in America, 
and its behaviour and structure, as far as they could be studied in the living 
condition, were carefully observed and accurately described and figured by 
him. Some 20 years later, Porter’s work on the same species appeared (1897), 
and threw much new light upon the finer structures. This species was also 
found in Italy, and was described by Grassi 1 in his famous work with Sandias 
(1893) on the termites. At first the Italian forms were considered to be 
identical with the American, but afterwards two types, major and minor, 
were distinguished by Foa (1904). The latter type was subsequently made 
by Grassi (1911) into a species, T. minor. In recent years several reports 
dealing with the forms belonging to this genus have been published. Fran 9 a 
(1916 and 1918) described the structure of an organism, identified as T . agilis 
by him, harboured by Portuguese termites. In 1917 a voluminous paper by 
Grassi appeared, in which large numbers of species of many genera, harboured 
by termites from various localities, were dealt with; and one new species of 
this genus— T. magna —was described from an Australian termite. One more 
report was published by Kofoid and Swezy in 1919. They described a new 
1 According to Grassi (1885) the organism was discovered in Italy by Condorelli. 
