EEPORT ON THE THNICATA. 
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duct on each side of the polycarp (PL XLIY, figs. 8, 9). The two ducts eventually 
unite into a single vas deferens which terminates on a prominent papilla projecting from 
the surface of the polycarp into the peribranchial cavity (PL XLIV. fig. 4, v.d.). The 
walls of the spermatic vesicles and their ducts are formed of distinct cubical epithelium, 
while the interior is occupied by small rounded cells and spermatozoa (PL XLIV. 
fig. 10, Lv.). 
Figure 8 on Plate XLIV. represents a transverse section through a polycarp, showing 
the spermatic vesicles arranged symmetrically on the two sides of the ova and omduct, 
while figure 4 represents a longitudinal section on one side of the middle line, showing 
the male system only. Figure 9 is an oblique section, and exhibits spermatic vesicles 
and their ducts cut at all angles. This last figure shows the position of the polycarp 
relatively to the superjacent mantle (m.) and test (#.). 
A large number of tailed larvae and some embryos were found in the peribranchial 
cavities of the Ascidiozooids. They lie mainly on the right side of the peribranchial 
cavity, and near the ventral edge. The fully formed tailed larva has an arrow-shaped 
body with a blunt anterior end (PL XLIII. fig. 9), and measures about 1 mm. in length. 
The tail is about 2 ‘5 mm. in length and has a wide membranous fringe. 
O O 
Goodsiria placenta, xai./iisca, nov. (PL XLIV. figs. 5-7). 
Two large colonies, dredged in Simon’s Bay, Cape of Good Hope, from a depth of 10 
to 20 fathoms, resemble Goodsiria placenta in general appearance, but differ in a number 
of details. Consequently I have thought it best to regard them as forming a variety of 
that species until further observations have been made upon the range of variability in 
the group, and upon the colours of the colonies in the living condition. 
Both specimens are larger than the colonies of Goodsiria placenta, and although of 
the same general shape as that species, differ slightly in their proportions, being elongated 
transversely, so as to be more ovate than discoid (PL XLIV. fig. 5). They are also rather 
thinner, and their surfaces are flatter. The dimensions of the colonics are as follows: — 
A. B. 
Length, . . . . . . . 9’0 cm. 8'0 cm. 
Breadth, ....... 12-0 „ 11 -5 „ 
Length of peduncle, . . . . . . ... 2'5 „ 
The colour of these specimens is very decidedly darker than in Goodsiria placenta, 
and the Ascidiozooids seen externally seem to be rather smaller and more numerous (see 
PL XLIV. fig. 5, and PL XLIII. fig. 1). The peduncle is relatively rather shorter ; in one 
of the colonies it is absent. 
The test is very much the same as that of Goodsiria placenta, but the mantle differs 
considerably in appearance and structure. It is thicker and more opaque than the 
