410 PROCEEDINGS OF THE SOCIETY. 
Messrs. W. Jolinson & Sons : — Advanced Students’ Microscopes ; Filaria 
sanguinis hominis ; Anthrax Bacilli; Larva of Anthomyia ; 
Young Star-fish ; Head of Syrphus ribesii ; Spicules of Synapta. 
G. C. Ear op, Esq. : — Transverse Section of Echinus Spine ( Echino - 
thrix f) ; Chromatoscope. 
T. J. Lambert, Esq. : — Indian Tortoise Beetle ; Head of Earwig. 
K. T. Lewis, Esq. : — Eggs and Larvae of Hemiptera from Natal. 
B. Macer, Esq. A living Blow-flv. 
G. Mainland, Esq. : — Asterina gibbosa. 
Marine Biological Association (Dr. G. H. Fowler) : — Crustacea Decapoda, 
and Mollusca Nudibranchiata — Collection illustrating the 
Plymouth Fauna. Collection of Oysters ( Ostrea edulis), show- 
ing local variations. 
H. S. Martin, Esq. : — Precious Opal from Queensland. 
The President (A. D. Michael, Esq.) A new and undescribed Acarus 
from New Zealand, intended to be called Notaspis spinulosa . 
Eggs of the Stone-mite ( Petrobium lapidum ) ; these eggs 
appear suddenly, generally in a single night, and often cover 
large districts; the specimens came from near Bath, where 
12 acres were covered as thickly as the stone shown. They 
may not appear again for many years. Plumularia setacea 
with extended tentacles as in life. 
H. Morland, Esq. : — Starch-grains of Euphorbia splendens ; Syndetoneis 
amplectans. 
E. T. Newton, Esq. : — Kerosine Shale with BeinscJiia. 
Messrs. Newton & Co. : — Triple Rotating Electric Lantern. (Figs. 
35 and 36.) 
The body of this instrument is made entirely of bronzed 
brass, mounted on four brass pillars and mahogany stand; 
the base is fitted to a traversing table of polished gun-metal 
and steel, and has screw movements for centering the arc 
light and for keeping it centered during use. There are three 
fronts to the lantern, each placed at an angle of 120 degrees 
from each other ; between each front is a door and sight-hole 
through which the light may be observed. The front on the 
left carries a 4J-in. condenser with slide-stage and double 
achromatic objective for exhibiting ordinary slides and dia- 
grams. The second front is also fitted wflth a 4J-in. double 
condenser for parallel beam work, and has a slit front having 
screw motions and rotating diaphragm. The third front 
carries the Microscope and micro-polariscope (fig. 36), and 
is fitted with quadruple 5-in. primary condensers, alum-cell, 
rotating stage, diaphragms, coarse- and fine-adjustments, 
and rotating polarizing and analysing prisms, &c. All the 
parts are interchangeable, and are so arranged that the instru- 
ments can be bolted on at will. 
W. J. Parks, Esq.: — Water-flea, Daplmia pulex ; House-fly. 
F. A. Parsons, Esq.: — Perophora Listen ; Daphnia Schaefferi ; Larvae of 
Corethra plumicornis. 
Dr. H. G. Plimmer: — Living Cultures made by Dr. Krai, of Prague, 
of Non-pathogenic Micro-organisms, and of the Bacilli of 
