496 MOLLUSCA. 
Height two and a half inches; diameter an inch and a half. 
A single specimen was taken, in three fathoms water, off the northern 
point of the entrance to the harbour of Rio Janeiro. [1. p. c. ] 
Figure 610, lateral view of the animal. 
ASCIDIA MONSTRANS. 
P. subglobosa, sursum porrecta et versus aperturam buccalem sensim 
angustata: apertura excretoria parva, valde inferior : tunica tenuis, 
levis, ex olivaceo aurantiaca demum sanguinea: labiis simplicibus, 
cihatis. 
ANIMAL small, subglobose at base, and produced towards the respi- 
ratory orifice in a long, tapering tube; the excretory orifice is very 
small, and seated far below the other, on a slight mammillation. ‘The 
tunic is thin, smooth, coriaceous, passing from olive-green at the base, 
through deep-orange to vermilion at the orifices; lips of the orifices 
simple, furnished with long, delicate ciliz, continually in motion. 
Height sometimes one inch; diameter about two-thirds the height. 
Obtained near the entrance of the harbour of Rio Janeiro, in three 
fathoms water, attached to old shells, &c. Couthouy. 
Figure 611, group of animals of different size. 
BoiTenta coacta (Gould). 
B. ovata, rigida, lanata, longitudinaliter rugosa, ochraceo-olivacea, pos- 
tice pedunculata: aperture subterminales, remote, cruciate, inermes, 
mmtus rosacee, mamillas obtruncantes. 
ANIMAL ovate, drawn out on one side into a peduncle of an inch 
and a half long, which terminates in a small, narrow, coriaceous, 
inflexible base. ‘This peduncle is quite slender at its lower part, and 
