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They are named H. dorsalis, H. maxi and H. peguensis.

H. dorsalis hails from the mountains of Northern Borneo and features a conspicuous dark stripe that begins atop its head and bisects its back before fading around mid-body.

There are five different forms of neurosyphilis — asymptomatic, meningeal, meningovascular, general paresis and tabes dorsalis — but, according to doctors who treated the man, he did not fall into any of those categories and did not exhibit any of the more common signs, such as nausea, vomiting or a stiff neck.

The work of Flexner and Noguchi on paresis and tabes dorsalis show that always in such afflictions the tissues of the central nervous system have been invaded by the parasite.

Pinna dorsalis corpore pen� �qualis, radiis simplicibus flexilibus.