Transactions and proceedings of the Royal Society of South Australia (Incorporated) . adsia, I am thoroughlyin accord with his treatment in the present a superficial glance at specimens from the various Aus-tralasian localities, they appear as one species, in shape, size,and colour, and this impression is confirmed by an examinationof the girdle, which is practically the same in all. To maintain the several separate species, viz., australis,evanida, and novae-hollandiae, we have to rely solely on theabsence or presence, in varying degrees, of the longitudinalsculpture; and a
Transactions and proceedings of the Royal Society of South Australia (Incorporated) . adsia, I am thoroughlyin accord with his treatment in the present a superficial glance at specimens from the various Aus-tralasian localities, they appear as one species, in shape, size,and colour, and this impression is confirmed by an examinationof the girdle, which is practically the same in all. To maintain the several separate species, viz., australis,evanida, and novae-hollandiae, we have to rely solely on theabsence or presence, in varying degrees, of the longitudinalsculpture; and as this can be shown to be quite inconstant inthe southern and western shells, and as some of these approxi-mate rather nearly to the Port Jackson form, it seems necessaryto treat them all as members of one variable species, but forconvenience to maintain evanida for the southern and generallysmoother form either as a subspecies, which is perhapspreferable, or as a variety. W$j Bh§6h , *^i-T ? > ? ? WH HBbo) fflP nKvU p«3 ? I •>.* V*.1- A tUmHB Ear? HB Hi imifl; K. ERRORS AND CORRECTIONS. Page 68, fifth line from bottom:—For S. posidonia readS. posidonialis. Page 80, eleventh line from bottom, should read: —Australian waters. I have a specimen collected by myself Page 85, first line of table:—Por Callochiton readCallistochiton. SHUN mm H
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectscience, bookyear1912
