PROM THE WEALDEN AND PFRBECZ FORMATIONS. S79 



Steneosaurs. The lateral and posterior portions of the pterygoids 

 • Zi7:™ at \T^ ted > S ° that the Nations of these o" the 



w berr i:At nd are not sW The tra — - *»« 



Teeth (fig .2a) -These are of very unequal sizes. In the maxilla 

 they gradually enlarge from the first to the fifth or sixth, counted from 

 before, which are stoutest ; and from these they decrease more sra 



small 7 7T ^ ^ ° f ^ jW < wh ™ th ™ relativ e ly ferv 

 small Each praamaxilla contained five teeth ; these are followed by 

 an ^interspace corresponding _ to the notch-like contraction of the 



r u l^ Gr 7 1 * ?™ m ^ J° in the m ^a. The maxillary series 

 is unfortunately incomplete, owing to gaps in the hinder part of the 

 maxillaa ; but there were probably 18 teeth on each side. A wh ch 

 had come into use have been broken off at the level of the alveolar 

 border or have fallen out: but the unworn crowns of three Terms 



SZ? "Wi * h %r.? Untl "° inted ' Stet ' ^eylindricf twT- 

 ndged, and striated. The ridges in two of the germs occupy a position 

 intermediate between an anteroposterior and "a transverse Section" 

 In a pieC e of rock accompanying the skull are three similar teeth - 

 the crown of the longest of these has, near its junction with he 

 root a transverse diameter of 0-8 inch. A small, strongly keeled 

 deeply pitted unsymmetrical, pentagonal scute, two sides of which 

 are mutilated, accompanied the skull. 



II. Crocodilian Skull in the British Museum (No 41 09^ 

 (PL XV. figs. 3 & 4.) ' ' ; ' 



T1 l iS S uU n Wa . S fir ^ brought under m y notice > nearly four years 

 ago, by Mr. Davies, the most obliging and able Assistant, who men- 

 tioned to me that it had a short time previously been acquired from 

 a dealer, who had obtained it at Swanage. This statement of its 

 locality was borne out by the rock in which it was imbedded, which 

 had every mark of Purbeck rocks occurring near that town. Last 

 June, whilst studying Mr. Willett's skull, I was struck with the 

 general likeness of its upper surface to that of this Swanage skull • 

 and, suspecting that the resemblance might also hold good with 

 respect to the palato-nares, I expressed a wish that the stone mi*ht 

 be removed from their situation. This was most obligingly done 

 and m their form, position, and construction the palato-nares 

 were found to closely repeat those in Mr. Willett's and in the Erook 

 skull the most obvious difference being that the palate-bones 

 seemed to bound rather more of the front half of the narial opening 

 than in either of these. Less distorted by pressure, the shape of thesf 

 openings is better seen m this Swanage skull (fig. 4). The posterior 

 Zt"v °l ^ e ff^ oid b0 ? e f CPO, nearly entire, are seen to unite 

 Zl ££ * tbe » are * b ^ e ^ these openings and the middle 



Eustachian orifice (Eu), which latter they slightly conceal. This was 

 apparent m the Brook skull, but, owing to mutilation, was not de- 

 monstrable in Mr. Willett's. In the Swanage skull the palate-bones 

 CpZ) widen out m front more rapidly than in the two other skulls, 



2c2 



