336 PROCEEDINGS OF SECTION D. 



Pliocene, in the Mediterranean Region, but I have already 

 announced its occurrence in our Old Tertiary, in an antecedent 

 species to S. Adamsi, and the present determinations are therefore 

 less unexpected. 



LOBIGER. 



L. Wihoni, n.sp., taken in life at Port Philip Bay by Mr. 

 J. B. Wilson, F.L.S. The genus includes four species in- 

 habiting the Atlantic Province, snd is characterised by the foot 

 developed into four-paddle-like natatory appendages. The Aus- 

 tralian species in respect of animal and shell is readily separable 

 from its congeners. 



UMBRELLA. 



U. co7'ticalis, n.sp., dredged in life in Port Philip Bay by Mr. 

 J, B. Wilson, and has been taken in a few individuals in St. 

 Vincent Gulf. This genus contains six tropical and sub-tropical 

 species one of which, U. indica, extends to New South Wales. 

 The new species, by the possession of a largely developed epidermis, 

 differs from all others ; in no conchological work which I have 

 consulted is any reference made to an epidermal covering to the 

 shell, and though not positively stated, yet its absence is implied. 

 Messrs. Adams give a drawing of the animal and its shell, as in 

 life, but the latter is represented as smooth and shining. 



A genus of Melania-like Turritellae containing two recent species 

 and several from the American and European Eocene. I have 

 taken, in South Australian waters, a few examples of what may 

 be Mesalia melanioides, Reeve, the habitat of which was unknown. 



STENOPUS. 



After repeated examinations of the animals of Helix subangu- 

 lata, Cox, and the southern representative of H. rustica, Pfeiffer, 

 I find that the anatomical characters are proper to Stenopus 

 {Guppya, Tate, 1867 ; Hahroconus, Crosse and Fischer, 1872.) 



Our heliciform pulmonates are not yet anatomically known to 

 permit of their generic groupings with any degree of certainty. 

 Tryon, in his " Manual of Conchology," has ventured to dis- 

 tribute them into various families and genera, in many instances 

 quite contrary to our actual knowledge, and at times he is 

 singularly unfortunate in his guesses. Some species referred to 

 Rhytida prove, on dissection, to be correctly placed ; whilst a few 

 included therein by Tryon do not belong to the same family. 



