22 Prof. M‘Intosh’s Notes from the 
and with acute tips. At the fiftieth foot a notch separates 
the two divisions, and the modified ventral bristles have 
a sharp and slightly hooked point minutely dotted under a 
high power. 
This is a fragmentary form, yet with such definite charac- 
ters as to render its identification easy. 
The first foot carries a subulate branchia and a large 
lanceolate layella. The ventral division also has a lanceo- 
late process, and the bristles in both are long and slender. 
From the shape of the body the lamellae and bristles occupy 
the dorso-lateral edge, so that the branchise, which readily 
fall off, pass transversely inward over the flattened dorsum. 
At the tenth foot the ventral lamella forms a broad, almost 
semicircular flap, with a tendency to a peak inferiorly. The 
ventral series of shorter broader bristles overlap the finely 
tapered ferms stretching outward along the lamella. 
The branchiz remain subulate at the twenty-fifth foot, and 
stretch beyond the elongated upper lamella, which is acutely 
lanceolate. superiorly, its outer edge being comparatively 
even till it curves inward inferiorly. The ventral lamella 
forms a blunt flap with the bristles in the groups just men- 
tioned. At the fiftieth foot the branchia is still rather long 
and subulate, and the upper lamella is prominent and 
rounded inferiorly, whilst superiorly it is acutely lanceolate. 
The upper bristles of the dorsal series are long, slender, and 
finely tapered. A notch separates the two divisions of the 
foot. The ventral lamella is also prominent and rounded, 
generally with a short peak. The modified bristles ventrally 
show a sharp and slightly hooked point, minutely dotted 
under a high power. No wings are visible in either dorsal 
or ventral bristles. 
Anew British species is Aonides paucibranchiata, Southern *, 
from Clew Bay and Berehaven. The snout is acute, though 
less abruptly so than in A. oxycephala, and it is prolonged 
backward to end in a peak. Four eyes occur posteriorly, 
the anterior pair having a larger space between them. The 
body, though mueh smaller, ‘has a similar form to that of 
A. oxycep hala, and it bears about ten gills anteriorly, 
the branchial region being thus different from that of the 
common form, in which “the gills appear to be closer in 
the preparations, though that may be caused by the methods 
adopted in preservation. In the seventy-cighth foot the 
dorsal division contains four hooks and six capillary sete. 
* Proc. R. I. Acad. vol. xxxi. No. 47, p. 100, pl. xi. fig. 24 a—x, 
