4, GEORGE BUSK. 
Professor Smitt, in his independent account of the latter 
of the two species described by Koren and Danielssen, 
remarks that the zocecia are widely distinguished by their 
form from those of other species of Bugula, inasmuch as 
the lower tubular portion is entirely wanting, as viewed in 
front, the membranous aperture occupying the entire ante- 
rior face. The aperture is wider above than below, so that 
the zocecium, he observes, has more or less of a boat shape, 
as in Beania. But the Bugula type is nevertheless evidenced 
in the incurvation of the inner border, whilst the lower 
border of the aperture is straight. The upper and inner 
angle is rounded off, and the outer more acute. The avicu- 
laria are placed high up on the upper and outer angle of the 
zocecium, and assume the same position, he says, as in 
B. avicularia, though rather more pointed upwards. 
On the dorsal aspect the zocecia present a still greater 
peculiarity. In this aspect they are flatly convex, with the 
outer border acute and the inner more rounded. 
The surface, as in tea anguina, is traversed by raised 
granular lines or ridges, which curve obliquely upwards and 
inwards. 
The lowest portion of the zocecium, which is in other species 
of Bugula more or less tubular, is in this case simply con- 
stricted, so as to constitute a laterally compressed peduncle, 
placed somewhat external to the middle line of the 
zocecium. 
Close to this constricted part, and near the inferior and 
outer angle of the zoecium, the radical tubes arise, the some- 
what dilated commencement of which completely fills up 
the space between the summit of the inferior or older 
zocecium, and the base of the superior or younger, being 
wedged in, as it were, between the two. From this point 
a radical tube grows downwards, running along the outer 
border of the lower zocecium, near the bottom of which 
it unites with a similar radical tube arising from that 
zocecium. . 
Sometimes, however, he observes this conjunction does 
not take place, but the two (or more) tubes are continued 
side by side. But, generally speaking, as they descend all 
distinction between the tubes disappears, their lumina 
appearing to run together, so as to form a broad expansion, 
which fills up the angular space between two contiguous 
branches of the zoarium, stretching across from one to the 
other. 
Professor Smitt also states that in the interior of this 
expansion numerous colonial nerve filaments may be seen, 
