140 Dublin Microscopical Club. 
O. hispidus ; it must, however, be observed that the species of 
this section of Onthophilus are very difficult to define, as, 
when in good condition, they are covered with minute 
spines and mud-like scales, and it is impossible to see the 
sculpture. As in the genus Dastarcus, the specific differ- 
ences are very slight. All the hispid species are arboreal 
in habit; the specimens I have from Japan were residing 
in galleries of wood-borers, probably Tomicus, and were 
8 or 10 inches from any orifice by which they could 
emerge. In Ceylon, I found O. hispidus in the same way, ob- 
taining a large number in one tree; and M. Raffray, under 
similar conditions, found O. cost/pennis (also a hispid species) 
in the island of Zanzibar. 
The locality for O. arboreus is the forest behind the large 
temple at Nara, in Hawatchi, where I took it in June 1881. 
PROCEEDINGS OF LEARNED SOCIETIES. 
DUBLIN MICROSCOPICAL CLUB. 
February 15, 1883. 
Magnetic Iron-Sand.—-Dr. Frazer showed a specimen of magnetic 
iron-sand, of which the crystals were of brilliant adamantine lustre, 
and showed several modifications of the primary form; these dis- 
played marked polarity when acted on by an artificial magnet, 
arranging themselves in bead-like strings. 
Starch-granules (?) remaining in the Ash of Platinotupe Photo- 
graphic Paper—Mr. Greenwood Pim showed a preparation of the 
ash of platinotype photographic paper after treatment with potass 
oxalate developer. Imbedded in the fibre of the paper were bright 
blue semitransparent bodies, somewhat rounded, and which dissolved 
in hot nitric and hydrochloric acids ; but cold acid did not appear to 
produce much effect. They were considered to be a peculiar form 
of starch-granule in the sizing of the paper. 
Nauplius-stage of Astacus.—Prof. Haddon showed the Nauplius- 
stage of Astacus fluviatilis, also the similar stage of a Cirripede for 
comparison. 
Penium rufopellitum, Roy, from Connemara, exhibited, to show 
the Eaufoliation of the external reddish Cortical Coating.—Mr. Archer 
showed examples from Connemara of Penium rufopellitum, Roy, a 
remarkable, if not very striking, Desmid. It is curious, as would 
seem, that this species has not been found out of the United King- 
