343 



Dimensions. — Diameters uf base, 6*5 and 5-5 ; length of tube, 

 t5 ; its diameter, 1 'O. 



Localities. — Eocene : Muddy Creek I ; Mornington I : Fyans- 

 iord ! ; (rellibrand Ei\ er !. 



3. Thylaeodes eonohelix, rm.-WoocU. PL ix., tig. ii. 



Vernietus couoheli.'', Tenison-Woods, Proc. Roy. Soc. Tasm. 

 for 1876, p. 100, 1S77. 



Solitary, " tube adhering, corrugated, coiled ; lower whorls 

 laterally depressed into a ridge, and coiled upon each other with 

 a truncated flattened hollow cone of two whorls, at the apex the 

 tube becomes free, obliquely erect, flexuous, and cylindrical ; 

 aperture somewhat thick and orbicular. Height of cone, 3 ; 

 breadth, 6; length of free end, 5; width of aperture, 1." 



The common form of this shell at Spring Creek, which I tigure, 

 has a more contracted base, and the anterior whorls forming a 

 •cylinder. 



Locilities. — Table Cape (Ten.-Woods .' ) : Spring Creek 

 (common !) ; Moorabool Valley, and Bellarine Peninsula (G. B. 

 Prifxltard . ). 



4. Thylaeodes asper, ^/^tc. nor. pi. ix., lig. lo. 

 Solitary, early whorls more or less regularly convolute ; finally 



horizontally extended, at first attached, but largely free. Free 

 tube with crowded, slightly elevated longitudinal ribs, narrower 

 than the sulci, crossed by intricately-disposed lamellar threads, 

 which produce asperities on the ril^s. 



Dimensions. — Diameter of the close spiral, 6 ; of free tube, 3 '5. 



Locality. — -Eocene: Gellibrand Ptiver I. 



5. Thylaeodes pudis, n^ec. noc. Pi. ix., tig. 8. 

 Usually solitary ; base contortedly coiled, broadly and laterally 



attached ; anterior whorls rounded, more loosely coiled and 

 irregularly bent, free part of tube short, not contracted, circular 

 in section. The early whorls are concamerated. Surface orna- 

 mented with longitudinal line, about eleven on upper and lateral 

 areas, distantly squamosely elevated. 



Dimensions. — Diameter of aggregate mass, about 25 ; diameter 

 of tube, 5-5 to 6. 



Locality. — Eocene : Table Cape I, Gellibrand River I. 



This species is the fossil analogue of Vermetns areiiarius^ Quoy 

 and Gaimard, from which it differs by less-compactly-coiled and 

 abruptly-bent whorls, and fewness of longitudinal lirje. 



6. Thylaeodes Adelaidensis, spec. nov. Pi. ix., Hg. 9. 

 Solitary. Attached portion not known. Free part filiform, 

 irregularly bent, circular in section ; surface ornamented with 



