49 
midae, communicated to the Linnean Society in 1 859, I 
admitted it, conjecturally, as a good species (‘ Proceed.’ for 
1860, Zoology, vol. v, p. 9). The determination has since 
proved correct, for it now turns out that this elephant-fluke 
(judging from those in our hands) is not only a distinct 
species, but that it differs also generically from the Distomes 
properly so called. In point of fact, it is a sort of transition- 
type between the genera Fasciola and Campula. This last- 
named genus I established in 1857 for a form which I found 
in the liver-ducts of the common porpoise ; but as the species 
under consideration comes rather more closely to the genus 
Fasciola than to Campula, I shall not seek to complicate mat- 
ters by adding yet another generic type. Anyhow, the 
nomenclature must be altered, consequently I herewith cor- 
rectly name, and for the first time fully describe, the species 
as follows : 
Fasciola Jacksonii, Cobbold. — Body armed throughout 
with minute spines, orbicular, usually folded at either end 
towards the ventral aspect, thus presenting a concavo-convex 
form ; oral sucker terminal, with reproductive papilla about 
midway between it and the ventral acetabulum ; intromittent 
organ in length ; digestive apparatus with two main zig- 
zag-shaped canals, giving off alternating branches at the 
angles thus formed, the ultimate caecal ramifications together 
occupying the whole extent of the body ; length, when un- 
rolled, from to ; breadth, to 4/'. 
Supplementary Note . — In all the specimens the alimentary 
tubes are filled with inspissated bile, and so completely so 
as to supersede the necessity of any attempts at artificial 
injection. Examples may now be seen in the Museum of the 
Royal College of Surgeons. 
Enumeration of Micro-lichens parasitic 1 on other 
Lichens. By W. Lauder Lindsay, M.D., F.R.S.E., 
F.L.S. 
The Lichens to which the present communication refers 
constitute an increasingly large and important group — for 
the most part of athalline forms — whose apothecia (with or 
without spermogonia or pycnidia) alone represent the plant : 
minute in size, frequently obscure and difficult of observa- 
1 I here use the term “ parasitic ” in its popular sense, including both 
“ Epiphytes ” and “ true Parasites,” as these are defined in the recent 
‘ Phytopathologie ’ (1868, p. 11) of Professor Hallier, of Jena. I cannot, 
however, agree with that distinguished German professor, or generally with 
VOL. IX. NEW SER. D 
