a a a i On i le i 
Le ee ee ee ee ee 
RIBS, AND SCALES OF CTENODUS. 61 
with the opercular plates attached ; a considerable number of 
the ribs are exhibited in connexion with the head, poned i in 
natural order. Everywhere re mixed up with this interes i 
ting speci- 
"men these iar scales are found, much broken, indeed, but 
h 
<a oth sides of the body portion a the fish, in such 
a manner as to leave no doubt on the subje e scales are 
very similar to those described in the text, dering only vagred 
y> the margin being wider ; the sm mooth central area has 
me 
The a the Se lszest vat most ee eatiat specimen, measures 
two inches and a half 1 and upwards of two inches wide. The 
sides are parallel, the scab extremity is alittle arched out- 
wards sterior or exposed extremity is rounded; the 
and marked with minute Ese strie ; no growth lines are 
visible ren the if wien border. On "examination with the 
is minutely granular. a 
is is only tf e cast of the b/g surface that is seen; and at this 
point it is evident that rged an 
sabes ag as to form pies and very irregular vermic’ 
anterior tony the sails sete rounded ; the border is vide 
and distin 
by several concentric lines of growth, and five 
minute ting strie, as in the ine spree ie central area 
<ctbowine similar ; but the minute -structure is finer, and 
the bor network has the meshes drawn out in the in axis of 
bh ae reieaaerg o a oe 
peng Air rages pidhaeok eo io es long, and one 
inch and one-eighth wi 
“ The t Bc ind age phish toa boat the greater portion of the 
or extremi is in other respects imperfect, 
is is upwarde ofan inch daa fies tonstk long ; it seems to have 
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