3^3 
longitudinally and has an undulating membrane 
(periplast), which is continued at each end in the form 
of a flagellum. Intracorpuscular forms are also 
described. Transmission is probably by ticks (Ixodine). 
Other Spirochaetes 
1. Sp. equi. —In the horse in French Guinea. 
12-15AS with three to four undulations. 
2. Sp. ovina. —In sheep in Erythraea, possibly 
identical with S. theileri. 
3. Sp. gondii. —In thegundi, Ctenodactylusgondi, 
N. Africa. 
4. Sp. jonesi. — In an African fish ( Clarias 
angolensis). Has a rigid appearance, unlike a spiro- 
chaete. 
5. Spirochaetes have recently been cultivated by 
Topfer from, the blood of owls (? species). Owls not 
uncommonly also contain trypanosomes. 
Spirochaetes in Insects 
Sp. culicis (Jaffe).—In the gut of larvae of Culex 
sp. in temperate zones. 
A. maculipennis. —In the gut of the larva, 8-17/^, 
with one to four nodes. 
C. pipiens. —(1) In the malpighian tubes in abun¬ 
dance (after feeding on blood), 25-30/^, with three to 
eight nodes. (2) In the gut , one species with two to 
three nodes, and another species, 15-25/^, with five to 
ten nodes. 
Chironomus plumosus. —In the gut, 15-20/^, with 
four to five nodes. 
Glossina spp. —Also in the gut. 
