490 DR. R. O. CUNNINGHAM ON THE REPTILES, 
considerable size, specimens above two feet in length having been found. The colour when 
recent is of a vivid scarlet, whence the specifie name, and the surface is papillate. I 
regret that at the time when the specimens were obtained, having much work on my 
hands, I had not sufficient leisure to undertake a minute investigation of the component 
animals, which are very small, seldom exceeding a line in length; and I have not suc- 
ceeded in making out the details of their structure after their three years' immersion in 
spirit. Their general arrangement and form, however, will be readily understood by a 
reference to the sketches which accompany this paper. (See Plate LVIII. fig. 3: a,a 
mass, is represented of the natural size; c shows a small portion of the surface, slightly 
magnified; b, a transverse section through one of the masses, of the natural size; d, a por- 
tion of the same, magnified; e, a single individual, still more magnified.) Numerous 
specimens are in the British Museum. 
144. APLIDIUM PEDUNCULATUM, Quoy et Gaim. 
Many specimens of a pedunculated Tunicate found attached to the fronds of Macro- 
cystis are not, I think, distinct from the above species from Australia, described and 
figured by Quoy and Gaimard (Voyage de l' Astrolabe, Mollusques, tom. iii. p. 626; Atlas, 
pl. 92. figs. 18, 19). 
145. APLIDIUM FUEGIENSE, n. S. 
Mass firm, flattened, disk-like, of a pale bluish-grey colour, marked with innumerable 
rather irregularly distributed slightly projecting points of a pale yellow colour (the 
individual animals). 
Several specimens of this Tunicate were dredged in the Strait of Magellan. The first 
was brought up on a fishing-line in Philip Bay, north-west of Fuegia, in December 1866. 
I have not been able, after much trouble expended in cutting sections of the mass, to 
make out the anatomy of the animals further than to satisfy myself that they belong uU 
the genus Aplidium. In fig. 1, Pl. LVIIL, a represents a portion of the surface of the 
natural size, b the same magnified, and c a vertical section magnified. 
146. SYCOZOA SIGILLINOIDES, Lesson. 
This name was given by Lesson (in the ‘Voyage de la Coquille,’ Zoologie, tom. ii. 
p. 436) to a remarkable pelagic Tunicate allied to Pyrosoma, which was taken “ flottant, 
par un beau jour de calme en Décembre 1822, à trente lieues au sud de la Terre-des- 
Etats, par 53 degrés de latitude australe, dans le voisinage du Cap Horn." The 
animal is figured in the * Atlas, Mollusques, No. 13. fig. 5. I obtained specimens of it 
only on one occasion, in December 1866, between the river Plate and the Strait of 
Magellan; and these are now in the British Museum. I may add thatIhave met with 
no notice of Sycozoa, save in the * Voyage de la Coquille.’ 
