n 
NEW AEKANGEMEKT OF 
JBuxBAU]?ioiDE^, Gen. (9_10.) 
Char. Calyptra imtra^ormis^fugax. Seta terminalis. 
Thexa gibba, obliqua, margine oris plus minusve creimlato. 
Operculum conicum. Perisfomium, membranum co7iicum 
longitudinaliter plieatum ex interior e ortum^ sine vel cum 
p)ertstomio ezieriore e processubus Jiliformibus consta7ite. 
Columella perlonga ad operculi summitatem porrectens. 
Char. Calyptra mitriform^ fugacious. Seta terminal, 
Theca gibbous^ oblique, the mouth being more or less ere- 
nulate. Operculum conical. Peristomium furnished with a 
conical membrane y longitudinally plicate., arising from witlu 
in the stoma, either without, or accompanied with, an ex- 
ternal pe7'istome of nume^^ous Jil/form processes. Columella 
very long, reaching to the summit of the opercidum. 
Obs. The two genera we have here associated toge- 
tlier are most nearly connected, as well by the peculiar 
form of the theca, as by the similar, conical, plicate, white 
membrane, with which the stoma is furnished. — Of the 
propriety,"''' says Dr Hooker, of their being placed next 
each other there can be no question, notwithstanding that 
one has a single peristomium, and the other a double one ; 
tlieir habit requires it ; and if w e were to consider alone the 
number of these parts, there would be no difficulty in as- 
signing them a situation ; the one to be last in the division 
of mosses with the single peristomium, the other the first 
in those with double ones. Yet this would, in other points 
of view, be unnatural, Diphyscium having more affinity 
with the genus Leptostomum, and some of the Gymnostoma 
