Ss MOLLUSCA. 
valve concentrically lineated; posterior valve with a prominent, cen- 
tral umbo, crossed by a delicate transverse ridge, behind which is a 
small, smooth, triangular space pointing to the umbo, which is yellow 
and smooth, and the remainder is concentrically lineated like the 
anterior valve. Margin rather narrow, banded with dark green and 
sky-blue granules. Interior pale greenish-white. 
Length one inch; breadth three-fifths of an inch. 
Inhabits New South Wales. Presented by Mrs. Mitchell. 
General aspect like C. Szculus, which, however, has radiating lines 
on the lateral areas. The coloration reminds one of the Gibraltar 
limestone, and the peculiar triangular area on the posterior valve, and 
the beautifully lineated, lateral areas, strongly characterize this shell. 
The lines on the lateral areas are about twice as numerous as the 
sulci on the central ones. The posterior smooth area bears some 
analogy to the fissure in C. eneisus. It is also allied to C. Stangert, 
REEVE; Conch. Icon., f. 150. 
Figure 430, dorsal view of the shell. 
CHITON ViRIDULUS, (Couthouy MS.) 
Testa tenuis, oblongo-ovata, dilutissimeé olivacea, ad dorsum sub-carinata, 
ulrinque sub-canaliculata, ubique sub lente quincuncialiter insculpta ; 
ares centralibus et laterahbus parum distinctis ; lines tncrementt 
prope marginem conspicuis; valvis terminalibus leviter radiatis : 
margo minutissimé squamatus: 
Chiton viridulus, GouLp; Proceed. Boston Soc. Nat. Hist., ii. 144. 
July 1846. Expedition Shells, 5. 
ANIMAL pale orange with a tinge of purple in the middle of the foot ; 
branchie of short pyramidal leaflets; mantle minutely granulated 
above, cream-coloured beneath. [s. Pp. c.] 
SHett small, thin, oblong-oval, slightly narrowed anteriorly, of a 
very pale olive or drab colour. Dorsal line rather acute, with a faintly 
indented line at a little distance on each side. ‘To the naked eye the 
shell appears smooth, but under a magnifier it is found to be every- 
where punctured in quincunx. Central and lateral areas not distinctly 
