94 NOTICES OF BOOKS. 
Treland only in two ar and that scantily—Co. Westmeath and 
Co. Galway]; S. tetracerum (Kiitz.) [the author meets 3-4 rayed forms 
he thinks roddacle to this species—doubtless correctly ; in Ireland such 
occur, though more ec than the Kiitzingian and Ralfsian form, 
Gace, but nob as % ocounsing in Ireland ; it is not, as Nord- 
aceboy in oa parallel b. anaes and ce — appertains to 
enn Pewee, Lun soit is very large and ‘eal 
culate stir membrane, nothing doubting, he observes, that ‘it is 80, 
though he nae not wnok bee mnRneneant: vias on the structure of these 
uart. Jou ier. vol. xii 310]; Zetmemorus Bre- 
bissonie ines. ds Ralf | ‘the sauce Seen the thick- walled mem- 
brane of the zygospore to be mes scrobiculate, but the examples 
he met with were not mature]; 7. Jevis (Kiitz.), Ralfs., and 7’. mimu- 
form of the former, — a minute species, and variable in i 
Closterium Archerian Cleve [rare in Ireland]; C. Cynthia, e 
Notaris [also rare in ecates nd|; C. gracile, Bréb. [the author very justly 
remarks that the form referred hereto by Lundell under this name 
without spines ; the latter is that occurring to the author in N orway]} 
C. directum, Arch. ., and C. Pritchardianum, Arch. |the former scanty, 
the latter frequent in Ireland]; Cylindrocystis diplospora, L Lundell 
[as fhe gather did not meet conjugated examples in Norway he is ul 
ce s to the identity in this case; it is a species seemingly 
esate va in Ireland] ; 2 ea margaritaceum (Ehr.), Bréb., “forma 
spiralis”? [the au uthor finds in Norwa y a form having ‘the dot-like 
granules arranged in spiral rows,” which he supposes to be a col- 
latum, Barker (Quart . Journ, Micr. Sci., vol. ix. n.s., p. 124), a form 
occurring in several places i in South and Middle of Ireland, but scantily ; 
the spiral strie on the latter are not dotted, but form thickened ribs, 
coarser, ro r, and more irregular and in than in amy 
Closteriwm, and the form appears to be wholly distinct fro Z 
garitaceum, though under a low power rea ough overlooked for 
the dots are scattered]; Penium pol hum, Lundell hould 
ymorphum, Lun [we s 
be inclined to sotnaiiie with the author’s view that, when highly 
