404 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
dant, enough is known to aid us in understanding conditions in the 
existing genus. 
Sauranodon incisivus (fig. J) from the Jurassic beds of the Rhone 
is apparently the most primitive type known since it lacks both supra- 
and infratemporal fossae, but Lortet’s (’92) accounts and figures are 
not easy to follow, and in some points are not easily reconciled with 
each other. LorteCs description of the parts in question runs: “En 
arriere [les parietaux] soudent, sur la ligne mediane avec les occipi- 
taux superieurs, tandis qu’en dehors, ils envoient en arriere, et en 
Fig. J. — Dorsal view of the skull of Sauranodon, after Lortet. F., frontal; 
«/?, jugal?; N., nasal; Pa., parietal; Pmx., premaxillary; Po., postorbital; 
Prf., prefrontal; Qj ?, quadratojugal?; Sq., squamosal; St., supratemporal. 
dedans une longue apophyse concourant a la formation des parties 
laterales et externes de la fosse occipitale. Ces apophyses, longues de 
12 millimetres, ont une largeur maxima de 10 millimetres. En arriere, 
ces apophyses tres remarquables se rejoignent presque sur la ligne 
mediane en formant de veritables crochets qui viennent presque se 
toucher au-dessus de Y occipital superieur, long lui-meme de 4 milli¬ 
metres et manifestement bifide dans sa partie posterieure.” But 
Boulenger (’93) has pointed out (and a study of the figure seems to 
justify him) that Lortet’s “apophyses de parietaux” are really the 
supratemporals. 
