IG 
Tom Ieedale. 
explorers being' made known. A Gerniaii naturalist then collected some speci- 
mens, and these, of course, were dealt with hy German concholog'ist.s. 
Some time later Cox, the Sydney conchologist, listed the species in his 
Monog’i'a]di, Init was fontent to indicate the various varieties only. Hedlcy 
attempted to ai’rauge the forms hut did not ])ublish his conclusions. 
A J'eal attempt to systematise them was made hy the inimitable American 
malaeolog'ist, Pilshry, in the “Manual of Concholog'y.” To assist him, Cox 
sent him a large collection hut unfortunately the bulk of that collection was 
labelled ‘Tving George .s Sound," the name covering all the adjacent locality 
within a radiu.s of a hnndred miles or so. Tlius Pilshry was baffled with the 
great variation in the shells from this locality, it is indeed iortmiate that 
the Cox collection, including the specimens handled hy Pilshry, is now in 
the care of the Australian IViuseum, and has been utilised in tliis study. A 
year or so later the German monograidicr, Kobelt, dealt with this grou]), 
and in the main followed Pilshry, hut did not realise tlie value of exact local- 
mes. in the future the scitmee of geozoology will probably play a great 
part in the elucidation of tills gi'Diiji, as the species ,and even liigher group- 
ings appear to ho living in government hy their geological and botanical 
environment, with, of cour.se, the rainlall being a matter of inpiortanee. 
file Hollinembryontids vary in size from about 2.') mm. to 50 iiini. in 
length, fi'oiii very narrow to plump in fonii, and from almost smooth to 
heavily graiiose si-ulpture. It is iirobahle that future investigators will dis- 
cover anatomical features in the animal to assist them, hut at present only 
the shells are available for examination. 
The notable variations are easily seen, as dii.i', indutns, melo, onslowi, 
hingii and gratwlckii. According to Pilshry’s rcsc-arclies these apiiearcd to 
show different apical features so that as a guide for future investigators I 
introduced suhgeiieric uanies, Bartogembrj/on for uiiKlowi, and tiutagembrjion 
for gratwicki Tlu' type of Bolhii»mbrgon i.s mclo, and Unrlogcnihriion 
seems to ho an offshoot from thi.s source, while Batagembrgoii may be a 
specialised iiroduct of the bingii root. However, da.i; and indiittis, the two 
largest forms, are thus left nameless, and while the latter may he related to 
the melo branch, it is now difl’crentiated clearly, and is her(> .subgenorically 
named Dialembryon. The source of du.i- is at iireseiit indeterminable, and 
a siihgeiius Ponembryon is here [iroposed to distinguish it. As Sutagembrgon 
is so almoriual, a suhgeniis Telembryon, is introdiu-eil for the normal Idngii 
series. By the usage of these subgeneric names, and the allotment of the 
named siiecies will secure greater accuracy and lead to a better knowledge 
of this interesting series of land-shells. It must he i)ointed out, however, 
that though dux and indutus are in no danger of confusion, (here are some 
shells that appear to link together bingii and undo, hut hiTter material and 
more local knowledge might easily dissipate the clouded outlook of the extra 
limital struggle for light in this delightful molluscan group. 
The Bothriembryontids are i)raetically confliied to the south-west corner 
of Western Australia, which I have called the Leeuwinian Aren, and con- 
■siitute a I'emarkalile ehunent of the Autochtlioniaii Faunula. Xortliw<ards 
the grou].) reaches Shark Bay, there mingling with the outlieivs of the Caurine 
Faunula of the Dampiei'iaii Sub-Area. Eastwards a few members range 
along the southern sea coast of the Centralian or Larapiutiuc Area, while 
one form i.s found in the middle of tliis Area, among the true representatives 
of the Eremiau or Eyrean Faunula. Now, in this Leeuwinian Area the 
groups abovenamed already seem to be limited in their distribution. Thus 
we have Telembryon from Vasso just north of Cape Natnraliste, then cling- 
