Feo ey rent re eee 
THE MOLLUSCAN FAUNA OF TASMANIA. 53 
Sub-class, OpIstHoBRANCHIATA. 
Hermaphrodite eee branchia away posterior uncovered, 
or only covered by a fold of the mantle. sae ae or in- 
ternal, testaceou ibe nceous, rudimentary, o 
1st Order Tesbibrabchixte: Branchia oneal iy hell or fold. 
Family, CyLicunip am. 
Animal with frontal disk, head sub-quadrate, truncate in front, 
produced behind into broad flattened recumbent lobes, with eyes 
immersed in front of their bases, mantle with posterior thickened 
lobe, foot shorter, thin shell truncate in front, no operculum. 
Odontophore 6- 6, no median, inner large and hooked, outer uniform. 
Shell without colour, eylindrical, ci ie convoluted, spire short. 
Cylichna 2, Tornatin 
Rane BULLID2. 
Animal, partly or wholly covering shell, frontal disk expanded, 
no eyes or sessile on frontal disk, mantle with right margin 
thickened, gg thin. Odontophore, one central tooth and lateral 
r an arched series, gizzard with calcareous plates, 
foot expanded for a gh Shell thin ventricose, spire none. 
Bulla, 1, Haminea, 1. LI include in this Philine 1, but the shell 
is wholly per. and the head differs 
Family, avi eirod. 
Animal large, eyes sessile, tentacles (?) ear-like, mouth with 
tentacles, mantle with internal calcareous plate ic ypeea gil. 
Odontophore broad, short, teeth, central one, lateral numerous 
similar, gizzard with cartilaginous plates. Aplysia 2 
N ri has been done se: erto with the Nudibranchinte 
rsue the classification for 
5 
2 
re) 
2 
) 
Lan 
B 
° 
er 
extend this essay pa long to explain the intermediate system. 
Our Marinula is a marine shell, and until the animal is studied 
tinguished by a siuinichiie ber Fr” respiration, a conical shell, 
and a short ligulate odontophore, iseol e small central tooth 
and an immense number of latera 
The length to which this paper sa extended prevents me from 
ing a synopsis of the Conchifera, to which I may return on a 
oe occasion, as well as to the Land and Freshwater mollusca. 
I wish to conclude with some observations on the geographical 
distribution of the species. I have already published my opinion 
that for convenience it would be “9 to divide Australia into 
several molluscan provinces. The S.E. coast forms one, Victoria 
* The Bullina lineata of Wood found at Port Jackson has a horny operculum. 
