DUBLIN MICROSCOPICAL CLUB. 105 
coneis regalis amongst the number. He called attention to a 
very pretty discoid form, which occurred in tolerable abundance, 
and which was new to him. ‘The slides beng mounted and 
covered he could see them only in one aspect, and, without being 
able to examine them more fully, could not decide as to their 
genus. 
Structure of MSpines of Centrostephanus longispinus. — Mr. 
Mackintosh presented transverse sections of the spines of Cen- 
trostephanus longispinus, which showed the usual dimorphic 
structure already described in connection with C. Rodgersii, trom 
which the present specimens differed to a distinctly appreciable 
degree, whilst presenting manifestly a generic similarity. It ap- 
peared not unlikely that the species under consideration would 
yield spines intermediate in structure between the conical and 
fusiform condition, and he drew the attention of the Club to the 
remarkable effect of injury to a conical spine which had the 
result of producing a reticular structure, only differing from that 
in the fusiform spine by its greater irregularity. 
Structure of Tail of Basking Shark.—Dr. Steele exhibited 
a section of a portion of the inferior lobe of the tail of the 
“basking shark.” The substance of this portion of the tail is 
traversed by a vast number of closely-set parallel “bristles.” 
Each of these is about 6—8"” long, about a millimétre in 
thickness, and when freshly removed from the surrounding 
tissue is brilhantly transparent. ‘To obtain a satisfactory 
transverse section a portion of the tail must be allowed to dry, 
when it may be cut by the ordinary slicing instrument. When 
moistened with water the section may be examined with a low 
power. Lach bristle thus appears to have a central canal, sur- 
rounded by concentric layers like hair or an ossicle in bone. If 
the section be steeped in alcohol, so as to remove the water, it 
may be at once mounted in balsam. It forms a pretty polarising 
object. 
Conjugated State of Pinnularia hemiptera.—Dr. J. Barker ex- 
hibited the conjugated state of Pinnularia hemiptera at the 
stage when the two “sporangial frustules” were just formed, 
and, as is usual, of twice the linear dimensions of the parents, 
the wall being transversely corrugated, as occurs in Navi- 
cala serians, Stawroneis phenicenteron, and others, which, when 
thrown off, the young frustules would assume the characteristic 
form of the species; as reminded by Mr. O’Meara, Dr. Pfitzer 
records this species being seen in conjugation by Schumann in 
1870; still a sight of almost any diatom in conjugation is a 
rarity. 
Section of Cirrhosed Liver exhibited —Mr. B. Wills Richard- 
son exhibited some stained sections taken from an extremely 
cirrhosed liver of a man who died in the Adelaide Hospital. In 
the specimens exhibited the bands of lymph were almost the only 
parts stained by the carmine fluid, so that they contrasted re- 
markably with the compressed and atrophied glandular structure 
