66 CJiapm/m and Prltchard : 



Observations. — The nearest ally to the above species appears 

 to be the North American form described under the name of 

 Pharyngodopilus carolinensis,! from the Tertiary Phosphate 

 beds of South Carolina; but the characters and arraufrement of 

 the teeth are distinct, the latter form having its dentition in 

 more regular series. We might also draw some comparison with 

 L. haueri, Miinster, sp.,^ from the Miocene of the Vienna Basin, 

 Italy, Sicily and Brittany, but this form does not have its teeth 

 so crowded, being usually openly spaced. 



Labrodon deppessus, sp. nov. (Plate Y., Figs, s-9.) 



Description. — There is amother specimen of the dentition of 

 Labrodon in our collection which, since it shows considerable 

 divergence from the foregoing species, we have thought ad- 

 visable to separate, noting some of its principal features. This 

 pharyngeal is remarkable for its thin and depressed aspect, 

 nearly equiamgular in outline, with rather irregular and closely- 

 packed teeth, and showing on the edges four successive layers. 

 On the lower surface the baisos of the teeth are well shown, and 

 each possesses a conspicuous and well-developed cavity, which 

 is central and circular. As compared with the previous species, 

 the teeth are rather lenticular than circular. 



Dimensions. — Diameter of largest teeth, 3.5 mm. : smallest 

 teeth, 2 'mm. Average height of teeth, 1.75 mm. Width of 

 hapryngerl, about 27 mm. ; antero-posterior diameter, Ifi mm. ; 

 total thickness, 8 mm. 



Locality and Horizon. --Beaum:iii-is, Port Phillip. Kalimnau. 

 (Pritchard Coll.). 



Family Diodontidae. 



Genus Diodon, Linnaeus. 



Diodon formOSUS, sp. nov. (Plate VL, Figs. 1-3 : Plate VII.; 

 Plate VITL, Figs. 1-7.) 



Description. — Jaws solid, and ajjparently heavier than in other 

 known fossil forms. Upper jaw with a. broadly-angular beak. 

 Lower jaw rounded in front, and more depressed on the inner 



\ Jourii. Acad. Nat. Sui., -iiid ser., vol. viii., 1S77, p. 2.%, pi. xxxiv., «•,';;. 10--J4 (espeoi- 

 all.v fi^'. 20). 



•2 I'liyllodus hauoii, von Jlliiister, ISeitr., I'etrefact, pt. vii., 1846, p. d, pi. i., tij,'. 1. 



