324 ‘ OBSERVATIONS ON THE 
minute close-set spines observed near the extremity of 
the outer margin of the maxille; but J/ygale ursina, 
Mygale avicularia, and Cteniza nidulans were found 
to have that deficiency amply compensated: by short, 
distinct, black spines, grouped, apparently without 
order, on the inferior surface of the base of those 
organs, towards their inner margin, and to have the 
apex of the lip also provided with similar spines (see 
Plate Il. figs. 3 & 4). Al/ygale zebra has spines at 
the base of the maxilla, but none at the extremity of 
the lip; and Atypus Sulzeri, which has the palpi in- 
serted near the base of the maxillze, on the outer side, 
is provided with numerous short spines on the inferior 
surface of those organs, towards the inner margin, but 
is without any either at their base or at the apex of 
the lip. 
I have hesitated to apply the term teeth to the 
conspicuous spines at the base and towards the inner 
margin of the inferior surface of the maxille and at 
the apex of the lip of certain species of the family 
Mygalide, notwithstanding that they are employed 
by them in retaining and also, to some extent, in 
lacerating their prey; but to a remarkable group of 
spines, situated on the superior surface of the maxille 
of Mygale zebra, and clearly indicating, by its position 
and structure, that the principal function it performs 
must be that of mastication, the appellation of teeth 
appears to be more appropriate (see Plate II. fig. 5). 
The spines composing this group, which are of a 
