70 
T03r Il!EDAT;E. 
tho charaetei'istic' seulpturc. The ai)ex is smooth, the adult whorls rno’osely 
plicate, the plicae irreg'ular, and ovei'all a enrioiiB oTaniilation. This sculp- 
ture is so peculiar that tho type species apjK'ars to have been described three 
times, Keeve calline' the sculpture “crumpled,” which is pi'obably the best 
word used. 
Plectorhagada plectilis Henson tSdd. 
Plate V., fig’, 15. 
1853 — Helix plectilis Benson, Ann. Mag. Xat. Hist., Rer. 2, Yol. XT., ]>. 2t), 
•Tan. 1. Shark Bay, West Au.stralia. 
T'ig’d. Re(‘ve, Conch.' Icon., Vol. VTT., pi. 172, S]). llTi, Oct., 1853. 
Cox, Mon. Austr. Land Shells’ p. 44, pi. TX., fig. 17 {copy of Reeve’s 
figure) ; pi. XX., fig. 8, from a painting of the type by Angas, May, 
1808. Tryon, M:iu. (’ouch., Ser. IT., Vol. 111., p. 215, pi. 40, fig. 18, 
1887. I’ilsbry, Man. Conch. (Tryon), Ser. Tl., Vol. \’I., p. 88, 
|d. 3.5, ligs. 1(1, 17. 18. 1800. 
18.54 — Helix pcilenla Reev(', Conch. Icon., Vol. VII.,, ])1. 100, sp. 1399, Dec. 
Banks of the Swan Hi\er, Australia (Bacon). 
Tryon, Man. Conch., Ser. 11., Vol. 111., p. 215, i)l. 49, fig. 17, 1887. 
(Cox and I’ilsbry. oi>]i citl., treat this as a synonym of above.) 
1864 — Helix carchurias Pfeiffer, Proc. Zool. Soc. (Lend.), 1863, p. 528, A|)l. 
20, 1864. Shark Bay. West Australia. 
Pi.g’d. Cox, Mon. Austr. Land Shells, ]). 45, pi. XX., fig. 12 (from a 
])ainting of the t,vp(> by Angas), May, 1868. 
The locality “Banks of the Swan Riv(n'” is dcHnitely incorrect, tin' 
species being only known from Shark Bay. Some are labelled Dirk Tlartog s 
Island and if is ]) 0 ssil)le (hat theia' may be races oi- even distinct sjiecies on 
(he islands such as Dirk Tlartog. Bernier, Doi’re, as well as Peron Peninsula. 
Peron recorded that helicoid land-shells were abundant on those islands, an! 
we have no series for examination yd. The specimen labelled “Dirk ITar- 
tog’s Island” is undoubtedly the same as those labelled “Shark Bay,” and 
probably all ai'e fi’oni the one lot. This measures 15.5 mm. in breadth by 
II mm. in height, and agrees very closely with Angas’ irainting of the type 
of plectilis, Pfeiffer's rurchnrias, according fo Angas’ iiaintiiig, is more 
conoidal, and is a living specimen, ‘•flesh-colonred," all ihe dead .shelL being 
white. 
Rensch (Zool. .lahrbuch (Syst.), ,lena. Bd. 63, heft 1, ])p. 1-139. A|)l. 
12, 1932), dealing with the IMolluscan Panna of Ihe Sunda Expedition, has 
recorded (p. 94). Khapadu plectilis supracosl iilclu Schepman, from Sumba, 
recording as additional races of It. plectilis, pHcatti Preston, enlona (Martens, 
and saxaensis Schepman. Such reviews by continental workers, being based 
on scant material and no local knowledge, are very misleading. The Aus- 
tralian shells, thus associafed by Hensch as “races,” plectilis and plicata, have 
little close relationship, and are very definitely not c()ns]iecific. The mere 
fact that they come from Western Australia seems to be the decisive factor 
in Rensch’s judgment. 
Plectorhagada rovina sp. nov. 
Plate V., fig. 17. 
A very beautiful little shell from Shark Bay, regaiahnl as the missing 
H. ini.stralis Menkc, is here desci-ibed, as il is r|uite nnlik(> (h(> descri])tion 
of the IMenkeau species. Shell small, stout, snbglobose with ehwated spire, 
sutures deep, whorls very rounded, mouth large and cii'cular, umbilicus 
