JONES — TRACKS, TEATLS, AND SUEFACE-MAUKTNQS. 



137 



vrith water. The eo^s^s themselves are sold in cakes in the market, 

 pounded and cooked, and also in lumps an naturel, forming a sub- 



Fig. 10. — A. piece of the dried clay Led of a poud in Kent, a, a, ova of boat-flies (?) ; 

 b, b', b", galleries, with raised roofs, made by water-insects ; c, c, furrow, made by 

 a water-insect, crossing the footprint (.r) at d ; at the furrow enters a gallery, of 

 which the roof has been brolcen ; at /" it becomes a tunnel or gallery, with convex roof, 

 such as seen also at b, b ; g, g, small galleries ; li, h, furrows ; i, i, holes ; Jc, k, shell 

 of a Limnceus ; m, m, a furrow-track. 



stance like the roe of a fish. This is known by the characteristic 

 name of ' ahuauhtl,' that is, ' water-wheat.' " 



The occurrence of the eggs of insects in the Mexican travertine, 



VOL. V. T 



