BY C HEDLEY, F.L.S. 



251 



■cusp exceeding the posterior margin of the base ; in retreating from 

 the centre the cusp becomes slighter and the distal posterior angle 

 diminishes from plate to square. About titty teetli intervene 

 between the rachidian and the ultimate marginals 



Of the genitalia, I notice that the genital bladder :s rather large, 

 oval, on a peduncle of moderate length whose origin is twisted with 

 the lower extremity of the oviduct. In the centre or' the hvge 

 penis-sac the vas deferens descu'bes a Midden loop after which it 

 enters the sac and proceeds to the spiral termination where is the 

 attachment of the retractor muscle. 



For my knowledge of the two latter species I am indebted to 

 the courtesy of AY. Bednall, Esq., of Adelaide, who sent mej 

 specimens of the Bulimus, from Streaky Bay, and of the Helix-, 

 from the Mncdonnell Ranges, Central Australia. H. per inflate 

 was described by Pfeiffer mi the Pro. Zool. boc, 1863, p. 528, from 

 specimens collected by Mr. Waterhouse on Stuart's exploring 

 expedition and was never again discovered, so Mr. Bednall informs 

 me, until quite lecently. My friend the late Mr. G. F. Angas once 

 stated *that this shell was identical with the Queensland species,. 

 H. Janelli, Le Guil ; a determination not characterised by his usual 

 sagacity an 1 quite unsupported by the examples of each species: 

 in the Queensland Museum. 



Protected by a thin epiphragm and in a dormant state, the 

 animal reached me alive after its lengthened fast and a journey of. 

 more than two thousand miles. 



* Quarterly Journal of Conchotomy ; Vol. 1, p. 135. 



