228 NATURAL HISTORY SOCIETY OF DUBLIN. 
strie of the last-named species are described as monzliform-costate. 
Ralfs* includes the moniliform striz among the characteristics of the 
genus; his words are, ‘‘ moniliform, generally interrupted strize.” 
The present form, which occurred not unfrequently in the Arran 
material, stands distinguished from the species hitherto described by its 
plainly costate stric. 
Grunow has described a species named Grevillianum, “ striis trans- 
versis tenuibus,’’ which in this particular approaches P. costatum ; but 
in outline, as well as by the fact of having but two central vitte, it is 
manifestly distinct from the present form. 
Melosira Wrighti (fig. 3), n. s.—Diameter, °0016’. The front view 
exhibits the appearance of a crown ; the sides, rising from the lower 
margin, curve slightly outwards, and after a little bending inwards and 
then downwards, form a broad circular rim round a circular depressed 
space, in which latter are two distinct nodules. The valve is perfectly 
hyaline, and without sculpture of any sort. Several forms of this spe- 
cles occurred exhibiting the side view ; I considered them to be Melosira 
Westi, until I was fortunate enough to procure a front view, when I 
was convinced that they belong to a different species. 
Pinnularia marginata (fig. 4), u.s.—Valve elliptico-linear, very 
slightly constricted in the middle; length, 00018; breadth, 0-0008- 
strize costate, submarginal, with a tolerably broad space between their 
inner termination and the median line; the median space bounded by 
double lines, which spring at either side from the angles of the central 
nodule, and curving gently outwards for about half their length, bend 
inwards, and meet in a sharp angle at the terminal nodule. 
Pinnularia scutellum (fig. 5), n. s.—Valve broadly elliptical; length, 
0:0027 ; breadth, 0:0020; strize costate, radiating towards the apices, 
leaving a narrow submarginal space, not reaching the median line; 
central nodule large; the median space large, lenticular, ornamented 
with a row of minute dots close to the outside of the boundary line. 
Amphiprora costata (fig. 6), n. s—Valve elliptical, much con- 
stricted in the middle; length, 0°0064; breadth at the widest part, 
0:0019; at the constriction, 0:0009. The keel costate; coste slightly 
radiating towards the apices, very short at first, gradually increasing 
in length for about one-eighth the length of the entire frustule, then 
gradually decreasing till they disappear, about one-eighth of the 
length of the valve from the central constriction. 
Dr. Joun Barxer, V.P., read ‘‘ Notes on the Bony Dorsal Shield 
of Tragulus Javanicus.”’ 
* Pritchard’s “‘ Infusoria,” p. 774. 
