350 
THE OCEAN WORLD. 
(Fig 140); P. peetiniformis, Lamarck (Fig. 141); and P. script' 11 *’ 
Born (Fig. 142). 
Fig. 141 . Pcctunculus pcctini- 
formis (Lamarck). 
Fig. 142. Pectunculus scriptus 
(Born). 
Among the Ostreadse the shells of Spondylus are distinguished f° r 
their variety of form and the brilhant colours with which they ar<3 
decorated. This makes them much sought after by amateur colled 01 )’ 
and procures for them a high price. The shell of Spondylus is s ° 1 
and thick, with unequal adherent valves, nearly always bristling 
spines, forming a very peculiar kind of ornamentation to the vah’ eS ' 
the hinges have two very strong teeth. The animals which inh a 1 
this shell resemble the oyster in many respects, but they still n l0li j 
closely resemble the Pectens. The edges of the mantle are provid” 
with two rows of tentacles, the exterior row being, many of the 1 ”’ 
furnished at their extremities with coloured tubercles. As exa®P^ 
we note several species of these bivalves for representation. 8$°^ 
dylus regins (Pn. XY. Fig. I.) is, perhaps, the most remarkable 
its immense spines. Spondylus radians, Lamarck (Fig. III.), is D ° ^ 
for its elegant form. Spondylus avicularis (Fig. IV.) shows rein 111 
able inequality in the valves. Spondylus imperialis, Chenu (Fig- * 'J 
has long projecting spines, like feet, and the Scaly Spondylus ( 
crassisquama, Fig. V.), is covered with scales arranged like so n 1 ” 
roofing-tiles. ^ 
Like oysters, the genus Spondylus is frequently found firmly r °° ^ 
to rocks and other submarine bodies, and, oftener still, heaped one ”P 
the other, like herrings in their barrel. 
These animals belong essentially to the seas of warm coun 
We find them, however, occupying considerable space in the M eC 1 \ 
ranean, where (Fig. YI.) the Ass-footed Spondylus (S. gsederof 
abounds. 
