Fossil Fish Remaivs. 269 



The teeth preserved apparently belong to the left side of the 

 lower jaw and represent two of the principal teeth. Each tooth 

 is characterised by a marked anterior fold situated at about 

 one-third the length of the tooth from the front ; the anterior 

 tooth has a very strong and broad main cusp which bears very 

 fine serrations, the serrations of the basal part of the crown 

 being much coarser and not a graduated series, but irregular in 

 strength ; the anterior slope of the adjoining tooth is finely, 

 deeply and more regularly serrate ; the posterior portion is 

 wanting. 



Dimensions. — Length, 11.5 mm.; height from base of jaw, 

 7.5 mm. These measurements refer to the perfect tooth. 



Locality and Horizon. — From nodule band at the base of the 

 cliflfs Beaumaris, Port Phillip. Collected and presented by the 

 late Mr. W. B. Jennings (Nat. M us. Coll.). From the good state 

 of preservation of our specimen it apparently belongs to the 

 Kalimnan Beds. 



Observations. — The relationships of our species point in the 

 direction of N. serratissimus, Agassiz, from the English Eocene 

 of the Isle of Sheppey and Highgate ; but in the fineness of its 

 serrations it shows an approach to the Pliocene, N. gigas, on 

 the one hand, and to the recent Indian grey shark, N. indicus, 

 on the other. 



This species we have named in honour of the late Mr. Jen- 

 nings, who did an immense amount of work on these beds, 

 though he appears to have received very little credit for his 

 labours. 



Family Spitiacidae 



Genus Acanthias, Risso. 



Acanthias geelongensis, sp. nov. (PI. XL, Fig. 15). 



Description. — Tooth with a somewhat slender and recurved 

 cusp ; base prolonged anteriorly ; with a posterior notch and 

 one or two crenulae on the posterior part of the base behind 

 the notch. 



Dimensions. — Length at base of tooth, 6 mm. ; height, 5 mm. 



Observations. — This species bears certain resemblances to 

 Acanthias orpiensis, Winkler sp. (27, PI. I., Fig. 17, and 32, PI 



