SERA AAT HR Desmoulins. 50 
Pleurotoma quoyi, Desmoulins, Actes Soc. Linn., Bordeaux, 
1842, p. 61; Reeve, Conch. Icon., vol. i., 1843, pl. 16, fig. 187; 
Surcula quoyi, Desmoulins, Tryon, Man. Conch., [eea, vol. vi., v. 
167, pl. xxxiv., fig. 82; Pleurotoma (Surgula) quoyi, Desmoulins, 
Weinkauff, Conch. Cab. (Ed. Kiister), 1887, Bd. iv., Abt. iii., 
p. 101, sp. 121, taf. xxii., fig. 2; Pleurotoma (Drillia) quoyt, Des- 
moulins, Watson, Chall. Reps. Zool., vol. xv., 1886, p. 304; Drillia 
quoyi, Desmoulins, Pritchard and Gatliff, Proc. Roy. Soc., Vic- 
toria, 1900, vol. xii. (N.S.), part 2, p. 170, ‘‘Western Port, etc.” ; 
Hemipleurotoma quoyi, Desmoulins, Tate and May, Proc. Linn. 
Soc., New South Wales, 1901, vol. xxvi., p. 368, ‘Tasmania.’ 
Plewratoma philipineri, Tenison-Woods, Proc. Roy. Soc., Tas- 
mania, 1876 (1875), p. 186; Tryon, Man. Conch., 1884, vol. vi., 
p. 167, pl. xxxiv., fig. 82. 
Pleurotoma monile, Valenciennes (non Brocchi) Icon. Coq. 
Viv. Mon. Pleurotoma, p. 52, pl. xv., fig. 3; Clavatula (Perrona) 
monile, Val., Tryon, op. cit., p. 282, pl. vii., fig. 96. 
This shell has been placed in several sections or genera. 
Cossmann, in Essais de Pal coconch. Comp., Deux Livr., 
1896, separates the Pleurotomide with an apical nucleus to 
their operculum in a family Pleurotomine from the Clava- 
tuline with a lateral nucleus. In the former he puts the 
genera Pleurotoma and Drillia; in the latter Clavatula and 
Surcula. This species has an apical nucleus, and is there- 
fore a Pleurotoma or a Drillia, and not a Clavatula or Sur- 
cula. The sinus, located at the carina and not above it near 
the suture, makes it a Plewrotoma and not a Drillia; while 
the short canal places it in the section Hemiplewrotoma (Coss- 
mann, 1889). 
Dredged alive in 17 fathoms, Investigator Strait; and 
in 10 and in 19 fathoms, Yankalilla Bay. It has been taken 
dead at all depths from 10 to 22 fathoms in Gulf St. Vin- 
cent and Spencer Gulf, and Backstairs Passage. 
A variant was taken in deep water in 110, 150, and 
200 fathoms off Beachport, 4 good specimens and 3 very poor, 
and in 130 fathoms off Cape Jaffa, all dead. It is longer 
and narrower, and has a less marked carina, and the spiral 
lire are less unequal. The type of P. monile, Valenc, Kien- 
er’s Coq. Viv. Icon., p- 52, pl. xiii., fig. 3, from “the seas 
of Oceania, the shores of New Holland, at Western Port,” 
shows no nodules either at the suture or at the angle. The 
transverse lire are described as striw, but the figure sug- 
gests spiral incisions, equidistant. This is very different from 
the South Australian form, which has well-marked nodules 
below the suture and on the angle, and valid spiral sub- 
distant lire, with two or three interstitial lirule between 
them. Shells sent me from the type locality, dredged by 
Mr. Gabriel, are much more typical, and confirm the figure 
and description, and show our shells to be variants. 
