. The annals and magazine of natural history : zoology, botany, and geology. sufficientto distinguish Saurodon as distinct. However, I observein some specimens of this supposed genus that some ofthe notches become closed into foramina; and we can easilyimagine all gradations between notches and foramina highabove the alveolar margin. Moreover, it is probable thatthe other character will fail. Recently Mr. Stewart * haspublished figures, without description, of remains whichhe refers to Copes Saurodon phlehotomus. Mandible andmaxilla are shown. Measurements show that the maxilla,without the pre
. The annals and magazine of natural history : zoology, botany, and geology. sufficientto distinguish Saurodon as distinct. However, I observein some specimens of this supposed genus that some ofthe notches become closed into foramina; and we can easilyimagine all gradations between notches and foramina highabove the alveolar margin. Moreover, it is probable thatthe other character will fail. Recently Mr. Stewart * haspublished figures, without description, of remains whichhe refers to Copes Saurodon phlehotomus. Mandible andmaxilla are shown. Measurements show that the maxilla,without the premaxillary, is nearly as long as the alveolarborder of the mandible, so that it is almost certain that inthis species there was no projection of the dentary beyondthe snout. It seems probable, therefore, that Saurodon mustbe abandoned. I present here (fig. 5) the right maxilla and the pre-maxillary (fig. 4) of another species of Saarocephalas, wiiich1 regard as yet undescribed. It is especially distinguishedfrom described species by its elongated maxillary bone. To Fig. X h illustrate this, I compare it with Mr. Stewarts S. dentafus,which is itself a species with a rather long maxilla. InS. dentatus the total length of the maxilla is 142 rnillim.,its height at the palatine condyle 48*5 millim. My specimenhas the same height at the condyle; but the total lengthis 172 inillim., a difference of 30 millim., equal to 21 percent, of the shorter maxilla. My species, tlierefore, probablyhad a relatively slender head and a larger mouth than hadS. dentatus. In the maxilla figured I count alveoli for thirty-seventeeth; but in the maxilla of the other side, s-jmewhat broken, • Kan. Univ. Quart, vii. pi. xvi. tigs. 4, 5. 486 On Species of Saurocephalus. the teeth extend backward somewhat farther, so that theremust have been forty. At some time in the career of itsowner the riglit maxiUa has been fractured obliquely acrossits middle, and this accident lias affected the neighbouringteeth
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