CHITONIDA. 115 
rayed with a very few granules ; brown rayed with yellowish lines, with 
a dark triangular spot on the umbonal summit of each valve ; ligament 
horny, transparent (Reeve.) 
Macquarie Island. Falkland Islands. (Sowerby.) 
Our species agrees very well with Reeve’s figure, but not with his des- 
cription. The anterior terminal area is distantly radiately ribbed, and the 
lateral areas are sometimes defined by a single rib. The umbone of the 
posterior valve is more posterior than in the drawing, and the valves are 
of a uniform brown colour. ‘The mantle is of the same colour as the 
valves. 
Sowerby gives the Falkland Islands as the locality for this species, 
but Reeve doubts it and gives no habitat at all. 
Genus, ACANTHOPLEURA—Guilding. 
Mantle densely beset with unequal corneo-calcareous, often very long 
spines, or with small calcareous spicula, giving it a spinulose appearance. 
Shell with the valves external, broad, transverse ; the hinder valve with 
the apex sub-central. The plates of insertion of the terminal valves are 
many lobed, of the posterior sometimes somewhat obsolete, and of the 
middle bilobed. 
A. celatus, Reeve, Conch. Ic., f- 101 3 T: stg-zag, Hutton, Trans. 
NV.Z. Inst., iv., ~. 180. Shell oblong, ovate, somewhat attenuated 
anteriorly, terminal valves, the posterior of which is small and slanting, 
and lateral areas of the rest broad-ribbed and neatly curved with close- 
set waved laminz ; central. areas very minutely reticulated; beautifully 
ornamented with green and pink ; mantle horny, here and there bristly 
(Reeve.) 
I follow Adams in placing this species in Acanthopleura, for I 
presume that he has seen the type specimens ; but it appears to me to 
belong more properly to AZopadia. 
Genus, CHAATOPLEURA—Shuttleworth. 
Mantle beset with horny bristles. Shell with the valves external, 
broad, transverse ; the hinder valve with the apex sub-central ; lamine 
of insertion of the hinder valve many-lobed, those of the middle valve 
br-lobed or six-lobed. 
GC. nobilis, Gray, Dief. N.Z, ii., p. 245; Voy. Erebus and Terror, 
Moll., pl. 1, f- 8. Mantle rugose, rough, with scattered long tapering 
brown bristles ; valves brown, convex, evenly rounded, with very minute 
dots like shagreen, the lateral area slightly marked with three or four 
indistinct rays ; inside white. 
Length, 3. (Gray.) 
Auckland. Cook Strait. Martin’s Bay. 
