On some New Marine MoUusca. 63 



made the type of a new genus) is common about Melbourne. 

 Physa Didvertonensis, Reeve, I have also seen, but no traces 

 so far of the peculiar and large Ancylus. If the ciliated 

 large Physce here described are all varieties of P. ciliata 

 nobis, the shell must be very variable; and all those of 

 Victoria have a marked uniform character ; it is very 

 possible that some of them may have been described before, 

 though after a diligent search I have not been able to dis- 

 cover where. Meanwhile it is very desirable that the species 

 should have names and descriptions easily accessible to Aus- 

 tralian naturalists, which I have accordingly given them in 

 the descriptions which follow : — 



Physa pilosa, n.s. P. t. suhu'inhilicata, tenui, nitente, 

 inflato, oblique, late ovata, lactea vel fulva, spira, fulva, 

 subpellucida ; anfr. 3, ultimo inflato et obliquo, 2 apica- 

 lihus pavvis, acutis ; regulariter longitudinaliter striatis, 

 periostraca lutea, indutis, lineis regidaribus pilosis vel 

 punctatis instvucta, sutura coronata, apertura oblique 

 ovata, antiee producta; labro tenui, labia reflexo. Lat. 6, 

 Long. 11, 1.11 mil. 



This may possibly be only a variety of P. crebreciliata. 

 It differs from it in being thinner, lighter in colour, with 

 a very thin periostraca — the extremely small spire, with the 

 oblique and interiorly produced aperture. 



Physa crebreciliata, n.s. P. t. uonbilicata, tenui, inflata; 

 late ovata, cornea, fusca vel albida et diaphana; periostraca 

 totaliter induta ; anfr. 3 J, duobus apicalibus parvis, pen- 

 ultimo perobliquo, longitudinaliter crebre striatis, et spiTal- 

 iter lineis ciliatis crebre instritctis, suturis periostraca 

 coronatis, apertura late ovata, tenuiter incrassata vel bila- 

 biata, labio conspicue reflexo. Long. 7, Lat. 15 mil. Caulfield, 

 Melbourne. 



Shell umbilicate, thin, inflated, broadly ovate, horny, 

 dusky or whitish and diaphanous, completely covered with 

 a ciliated periostraca ; whorls 3 J, the two apical ones small, 

 the penultimate peroblique, thickly striate leng-thwise, and 

 furnished with close spiral ciliated lines ; sutures crowned 

 by the periostraca, aperture broadly ovate, slightly thickened 

 or bilabiate, lips conspicuously reflexed. 



The cilia in this shell are in regular equi-distant spiral 

 lines, and at the sutures the periostraca seems to mass 

 itself in small rough folds, so as to make a spinous ridge. 



Physa arachnoidea, n.s. P. t. elongata ovata vel subcylin- 



G 



