EEPOET OX THE THXICATA. 
119 
The relation of the genital organs to the alimentary canal is seen in a transverse 
section of the abdomen (PI. XVII. fig. 10). This section must have been cut obliquely 
with the dorsal edge more anterior than the ventral, as the spermatic vesicles do not 
usually extend so far forward as the stomach. Probably a line connecting g. and st. in 
figure 9 would be nearly in the plane of the section. The vas deferens in the transverse 
section (PI. XVII. fig. 10, v.d.) lies further from the intestine than it generally seems to 
be in surface views and dissections. The space between the stomach and intestine is 
occupied by the heart, in the walls of which cross striped fusiform muscle fibres are 
distinctly %’isible. 
Colella miu’rayi, var. rubidct, nov. (PL XVII. figs. 12 -14). 
The collection contains a small colony which was dredged from Station 162,^ in 
Bass Strait, at a depth of 38 fathoms, and which I was at first inclined to regard as 
belonging to Colella munxiyi. A closer examination, however, revealed several points 
of difference, so that I have thought it best to place this specimen as a variety of that 
species. It is unnecessary to give here a formal description; that belonging to the last 
species will serve, if the various differences to be enumerated presently are borne in mind. 
The colony (PI. XVII. fig. 12) consists of a short, somewhat triangular head, borne on 
the summit of a short thick peduncle. The head is flattened laterally, and has a 
truncated appearance at the top, which is the widest point. The sides slope downwards, 
the head tapering gradually into the peduncle. The extreme length of the head is 7 mm., 
the greatest breadth almost 10 mm., while the thickness varies from 5 mm. at the base 
of the head, where it joins the peduncle, to 3 mm. at the top. The peduncle is between 
6 and 7 mm. in length and about 5 mm. in thickness. It expands considerably at the 
base where attached. It is not flattened laterally. 
From the above description it is clear that this colony (PI. XVII. fig. 12) agrees 
•very closely in general form with the specimens described under the last species. The 
colour, however, is veiy different. In the present case the whole colony is of a somewhat 
ruddy brown colour. There is no distinction between the tint of the peduncle and that 
of the head, but the extreme top of the colony (PI. XVII. fig. 12) is slightly lighter 
and more transparent than the rest. There is no white pigmentation in any part of 
the specimen. The surface is even, but distinctly rougher than in the last species, being 
finely granulated all over both head and peduncle. 
The Ascidiozooids are comparatively few in number, and seem smaller than in the last 
species. They are arranged in the same manner, but the vertical rows are not quite so 
distinctly marked off into pairs (PI. XVII. fig. 12). There are about one hundred and 
twenty Ascidiozooids altogether in the colony, and they form twelve pairs of vertical 
' Station 162, April 2, 1874 ; lat. 30° 10' 30" S., long. 146° 37' E.; depth, 38 fathoms ; bottom, sand and shells. 
