178 
SPECIFIC 
PLATE XXVIII. 
Fig. 1. C HIT o Ts porosus. 
Shell 8“valved, carinate, valves with a tooth on 
each side, covered entirely with the marginal mem- 
brane. 
Specimen pale olive above, sides brown ; cori- 
aceous covering cinereous or pale brown, tomen- 
toiis ; perforated over the back of each valve with 
a small slit and two tubular pores, one on each 
side ; over the anterior valve four pores ; valves 
finely striate and irregularly granulate ; posterior 
valve indented in the margin ; lateral triangles 
marked by an obsolete fold, and terminated by a 
small, sharp, tooth -like process. 
Habitat uncertain, but probably New South 
Wales. 
The animal possessing this very curious multi- 
valve shell differs from the inhabitant of Chiton 
in the arrangement of the lungs, which do not 
extend so far on either side, but only about one 
third of the length ; and in the intestinal canal. This 
dissimilarity in the worm will not however be a 
sufficient ground for separating it from the first 
