400 Miscellaneous. 
On the maxillee of six out of seven Spiders which I have examined, 
belonging to various genera, there is a row of very regular and per- 
fectly formed teeth on the outer edge of the extremity of the maxilla. 
These teeth vary slightly in form in the different species, and the 
first of the row is sometimes unlike the succeeding teeth. The 
species examined were :— . 
Agelena labyrinthica, 2. Theridion quadripunctatum, 2. 
Salticus scenicus, Q. Epeira callophylla, °. 
Theridion nervosum, 9. Tetragnatha extensa, Q. 
lineatum, °. 
Of these only one of the Theridions showed no teeth; but the 
specimen was not satisfactory, being ill prepared and mounted. The 
jaw of one (Agelena labyrinthica) presented an appearance of a 
second row of teeth, forming a waved line running down the surface 
of the maxille, and quite distinct from the marginal row; but as 
this occurred in no other species examined, nor even in another in- 
dividual of the same species, as it seemed much less substantial than 
the marginal row, and presented other suspicious appearances, and 
as the specimen was prepared and mounted before the teeth were 
observed, I cannot be sure, without the examination of other speci- 
mens, that this is a genuine row of teeth. Unfortunately the fellow 
jaw was thrown away without being looked at. 
Fig. 1. 
Fig. 1. The jaw of Agelena labyrinthica, magnified. 
2. The beginning of the row, more highly magnified. 
In one or more specimens the teeth appear to have been worn or 
broken by use. All the specimens referred to are mounted in Canada 
balsam, and are now in the collection of the British Museum *.— 
Proc. Zool. Soc. 1865, p. 673. 
* [Since this paper was read, Miss Staveley has examined several other 
species of Spiders, and found these ‘teeth developed in all of them.— 
J. E. Gray. ] 
