326 
Herpetomonas patellae, n.sp. 
The division of the flagellate forms of H. patellae (Figs. 15-17) follows 
on the same lines as that of H. jacidum, H. lygaei, H. pediculi and other 
herpetomonads. The order of division is blepharoplast, flagellum, 
r'igs. 15-17. Herpetomonas patellae. Dividing forms. 
X 3000. 
nucleus, cytoplasm. Division of the flagellum, which may be unequal, 
was observed in the living organism. No budding phenomena, such 
as those described by some authors for the flagella of dividing H. muscae 
domesticae, have been observed. No division rosette formation has 
been seen in H. patellae, nor were aggregation rosettes found. Perhaps 
this was due to the scanty infection encountered. 
Nutrition of H. patellae. 
Apparently the larger number of the herpetomonads were nourished 
on the liver fluid surrounding them, which they absorb by osmosis. 
There was no evidence of the existence of a cytostome, cytopharynx 
or cytopyge in H. patellae. A recent suggestion that the myoneme 
striations of some herpetomonads were really the edges of a cytopharynx 
is inaccurate so far as H. patellae and H. jaculum are concerned. Though 
continuous observations were made, no organised substances such as 
bacteria or food particles, either in process of ingestion or digestion, 
were seen in the body of H. patellae. Nutrition seems to be by passive 
absorption of fluid food by the general body surface, and resembles 
that of other insect flagellates and such organisms as trypanosomes. 
Mode of Transmission. 
A few post-flagellate forms were obtained from the anal portion of 
the gut of the limpet. Flagellate forms were not common in the gut, 
though a few flagellates were seen in the rectum and freshly shed faeces. 
The occurrence of post-flagellate forms in faecal matter suggests that the 
mode of infection is contaminative. The paucity of infected material 
prevented further experimental work being undertaken. The flagellates 
