EEPOET ON THE THNICATA. 
219 
Cunningliam, -^liich ’^as found in tlie Strait of Magellan during the cruise of H.M.S. 
“ Nassau.” That species is, however, described^ as being of a pale bluish-grey colour, 
and may possibly be more nearly allied to Amarouciumcomplanatuin (see p; 221). 
Amaroiicium vancibile, var. tenerum, nov. (PI. XXIX. fig. 6). 
Two of the smaller colonies from Kerguelen Island, 28 fathoms, and three of those 
from Kerguelen Island, 10 to 60 fathoms, differ considerably from all the other specimens. 
They are of somewhat elongated form and have no peduncle (see fig. 9, e., p. 217). 
One of the colonies from Kerguelen, 10 to 60 fathoms, consists of three masses 
(PI. XXIX. fig. 6). The colour is a pale grey with no yeUow tinge, and the surface is 
smooth. 
The Ascidiozooids are rather narrower and more transparent than in the other colonies 
(PI. XXIX. fig. 6), and the stomach has the longitudinal folds very slightly marked. 
In other respects these specimens agree with the description of the species given above. 
They may be regarded as forming a well-marked variety. 
Amaroucium globosum, n. sp. (PI. XXIX. figs. 1-5). 
The Colony consists of a globular mass supported by a very short stout peduncle. 
There is a distinct constriction at the top of the peduncle, and the lower end is rounded, 
the area of attachment being ver}^ small. The surface is even, but not quite smooth. 
The colour is a pale yellowish-grey, becoming slightly darker on the peduncle. 
The extreme length is 4 cm., of which 17 cm. is the peduncle ; the greatest breadth 
is 27 cm. and the greatest thickness is 1'8 cm. ’The thickness of the peduncle is 
1'5 cm. 
The Ascidiozooids are of moderate size, and are not very numerous. They are 
arranged in systems of somewhat irregular shape formed by branched lines radiating 
from the common cloacal apertures, several of which are visible upon the upper surface of 
the colony. The Ascidiozooids are about 7 mm. in length and 1 mm. in breadth. The 
body is clearly divided into three regions, of which the post-abdomen is the longest and 
the abdomen the shortest. 
The Test is soft and gelatinous in the upper part of the colony, but much stiffer in 
the peduncle. The outer layer all over the surface is firmer than the inner part, and 
may be separated as a distinct membrane. The test is of a light grey colour, and 
is transparent. The test cells are numerous but small and not pigmented. No bladder 
cells are present. 
The Mantle is thick and opaque. The musculature is not very strong, and the chief 
muscle bands run longitudinally. The branchial sphincter is well developed. 
1 Trans. Linn. Soc. Land., vol. xxvii. p. 465, 1871 ; and Notes on Natural History of Strait of Magellan, p. 66, 
Edinburgh, 1871. 
