SEMION’OTIDiE. 
83 
inner teeth not excessively elarged, the 
majority oval and with apical tubercle ; 
principal flank-scales with few large 
denticulations at least in their lower half, leedsi, p. 99. 
Innermost splenial teeth excessively enlarged, 
round, without apical tubercle . affinis, p. 101. 
Operculum nearly twice as deep as its 
maximum breadth, which equals about 
one-third the length of the head ; 
inner teeth not excessively enlarged, the 
majority oval and with apical tubercle; 
scales not serrated, but the postero- 
inferior angle more or less produced, and 
the hinder margin often with one or 
two notches immediately above this .... unguiculatus, p. 102. 
(5.) Scales in part marked with radiating furrows. 
Majority of inner teeth oval, with apical 
tubercle, those of splenial in more than 
three irregular concentric series . Icevis, p. 103. 
Maximum width of operculum two-thirds 
as great as its depth, and equalling about 
one-third the length of the head; majority 
of inner teeth round, without apical 
tubercle, arranged on splenial in six or 
seven irregular concentric series. palliatus, p. 103, 
Majority of inner teeth round, without apical 
tubercle, arranged on splenial in four or 
five irregular concentric series . maxi?nus, p. 10-5. 
(c.) Scales smooth, but exhibiting nearly par¬ 
allel transverse grooves when abraded. 
Maximum width of operculum nearly two- 
thirds as great as its depth, and equal¬ 
ling about one-third the length of the 
head ; principal flank-scales more or less 
coarsely serrated, sometimes crimped; 
dorsal ridge-scales inconspicuous. mantelli , p. 108. 
Maximum width of operculum about two- 
thirds as great as its depth, and equal¬ 
ling one-half the length of the head; 
principal flank-scales with two or three 
very large denticulations on the lower 
half of their posterior border ; dorsal 
ridge-scales inconspicuous. degenhardti , p. 119. 
Scales with long slender posterior denticula¬ 
tions ; principal flank-scales considerably 
deeper than broad; dorsal ridge-scales 
conspicuous. hauchecornei , p. 119, 
g 2 
