42 Proceedings of the Royal Societi/ of Victoria. 



will venture to name and descrilje tlieni as such, at least 

 provisionally : — 



The first and most important to be described is a 

 shell belongino^ to the Bellerophontidtie, a group of extinct 

 shells of generalised form, which had charactei's that are 

 now divided between the Cephaloi)()da. the Heteropoda, 

 and groups of Gasteropoda, of which Pleurotomaria and 

 Haliotis are respectively the t\qjes. It is a Trernaiiotiis 

 v/hich I have named T. pritchardi, in compliment to Mr. 

 G. B. Pritchard, a well-known ge(Jogical friend, who has 

 kindly lent me the best specimen that I have with me, and 

 which he found in the Lilydale quariy some time ago. 

 8p. Char, of T. pritchardi shell discoidal, bi-concave, 

 trumpet-shaped, and very thick, consisting of about live 

 rapidly increasing whorls, forming a deep umbilicus on both 

 sides ; spire elliptical in section, and back symmetricall}^ 

 convex. Breadth of the shell about two inches, length from 

 three and a half to four inches. Aperture very much 

 expanded and reflected like the mouth of a trumpet, but 

 more so anteriorly than laterally ; the inner surface of 

 expanded outer lip quite smooth. No slit or sinus as in 

 Belleropbon,but the middle dorsal line of the shell is pierced by 

 a row of oval siphonal openings, resembling those of Haliotis, 

 there are about seven of them to an inch of the ])eriphery. 

 The outer surface of the shell is ornamented with spiiul 

 fluctuating lines parallel to the dorsal keel, and becoming 

 on the ex[)anded outer lip more flattened, coarser, and more 

 plait-like. There are also the very distinct lines of growth 

 in a transverse and backward direction to the dorsal keel, 

 that are so characterestic of the Bellei'ophontida3. The lines 

 in the two directions condjining in this shell to give a very 

 distinct fenestrated appearance. T. pritchardi has in general 

 form a near i-esemblance to "Tremanotus maideni," described 

 by Mr. Robert Etheridge,* from tiie Hawkesbur}^ (Trias) 

 rocks of New South Wales, and which he legards as a 

 curious survival from Silurian times, but, besides other 

 differences, our fossil is a very mucii thicker shell. 



The next fossil to be briefly described as far as may be 

 from very imperfect specimens, is Eunema etheridgei, a 

 gasteropod shell that a[)pears to belong to the Littorinida?, 



* Departraeut of Mines. — Memoirs of Geological Survey of New South 

 Wales. PaliEontolouy I. Invertebrate Fauna of Hawke-bury ; Wiauamatta 

 Series, by llobett Etheridge, jun. 



